All 281 Online Developer Tools by Category

Browse by Category (11)

All Tools (alphabetical)

AES Encrypt Decrypt - Secure Text Online

Free AES-256-GCM encryption tool. Encrypt text with a password using PBKDF2 and Web Crypto, or decrypt it. Runs in your browser, nothing is uploaded.

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Age Calculator - Years, Months, Days & Birthday

Free age calculator. Calculate your exact age in years, months, days, hours. See next birthday countdown and milestone dates. No signup required.

AI Image Generator - Free Unlimited DALL-E 3 Flux Stable Diffusion

Free AI image generator. Create unlimited images with DALL-E 3, Flux, Stable Diffusion. No signup, no watermark, no daily limit. 100% private browser processing.

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AI Social Media Post Generator - 5 Platforms Free

Free AI social media post generator. One input, 5 platform-optimized posts for Twitter, LinkedIn, Instagram, Facebook, TikTok. No signup.

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AI Story Animator - Novel to Video with Agnes AI

Free AI story animator. Input a novel chapter, get a full storyboard with images, videos, and narration. Powered by Agnes AI multi-modal API. Video generation rate-limited to 1/min.

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AI Video Generator - Text to Video Free No Signup

Free AI video generator. Turn text prompts into MP4 videos with Agnes AI. 4 aspect ratios, 2-5s durations, image-to-video. No signup, no watermark, no daily limit.

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Anagram Solver & Word Unscrambler - Free

Free anagram solver. Enter letters (use ? for blanks) to find every valid word from a 168K-word dictionary with Scrabble scores. No signup.

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ASCII Art Generator - Image & Text to ASCII Converter

Free ASCII art generator. Convert any image or text into ASCII art with 5 fonts, adjustable width, contrast and custom characters. PNG & TXT download, 100% private. AI cannot pixel-map real images or render aligned banners - we do.

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Aspect Ratio Calculator - Free Online Tool

Free aspect ratio calculator. Calculate aspect ratio from width and height, find missing dimensions, visual preview of 16:9, 4:3, 21:9 ratios. Social media presets for YouTube, Instagram, TikTok, Twitter. 100% private.

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Astronomy Calendar - Moon Phases & Meteor Showers

Free astronomy calendar with daily moon phases, sun rise/set, upcoming meteor showers, eclipses, and planetary events. Pure browser-based calculations.

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Audio Cutter & Trimmer

Free online audio cutter and trimmer. Cut and trim MP3, WAV, M4A, FLAC, OGG with waveform precision. No upload, 100% private.

Audio Denoiser - Reduce Background Noise Free

Free audio denoiser in your browser. Remove hiss, hum, rumble and ambient noise from MP3, WAV, M4A, FLAC. 4 presets, custom sliders, 100% private.

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Audio Editor - Free Online Audio Effects & Editing Tool

Free online audio editor. Cut, fade, normalize, change speed/pitch, add reverb/echo, EQ bass/treble, reverse, trim silence. 100% private browser-based editing. No upload.

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Audio File Transcriber - MP3 to Text Converter Free

Free audio file transcriber. Convert MP3, WAV, M4A, OGG, FLAC, AAC, MP4, MOV, AVI to text via Groq Whisper AI. SRT/VTT export, 25 languages.

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Audio Joiner & MP3 Merger - Merge Audio Files Free

Free online audio joiner. Merge MP3, WAV, M4A, FLAC, OGG into one with drag-to-reorder, crossfade or silence gap modes. 100% private browser processing, no upload, no signup. AI cannot merge audio - we do.

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Audio to Text Converter - Free Online Speech to Text

Free online audio to text converter. Convert speech to text in real-time with browser-based voice recognition. No uploads, no sign-up, 100% private.

Auto Loan Calculator - Free Car Payment Calculator

Free auto loan calculator. Calculate monthly car payments with vehicle price, down payment, trade-in, sales tax, APR, and loan term. Compare 24-84 month terms with full amortization schedule. No signup, 100% private browser tool.

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Background Remover - Remove Image Background Free Online

Free online background remover tool. Remove image backgrounds automatically. No signup. Works with JPG, PNG, WebP. Fast and private.

Barcode Scanner - Decode EAN, UPC, Code 128, QR Codes

Free online barcode scanner. Decode EAN-13, UPC-A, Code 128, Code 39, QR codes and 15+ formats from images or camera. 100% private, no upload, no signup. AI cannot scan barcodes - we do.

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Base64 Encoder/Decoder - Encode Data

Free online Base64 encoder and decoder. Encode text to Base64 or decode Base64 back to plain text instantly in your browser. Private, no upload, no signup.

Base64 to Image Converter - Convert Base64 String to Image

Convert base64 strings and data URIs to viewable images. Supports PNG, JPG, WebP, GIF, BMP. 100% private, browser-based, no upload required.

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Bingo Card Generator - Free Printable

Free printable bingo card generator. 1-75, 1-90, or custom themed. 100% free, no signup, no watermark, no upload. AI cannot generate cards - we do.

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Body Fat Calculator - Navy, YMCA & BMI Free

Free body fat calculator: US Navy, YMCA, BMI and Jackson-Pollock methods. Fat mass, lean mass, healthy ranges and target weight. Private, no signup.

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Calorie Calculator - Free TDEE BMR & Macro Calculator

Free calorie calculator. Calculate your TDEE, BMR, and optimal macros for weight loss, maintenance, or muscle gain. Mifflin-St Jeor equation, no signup, 100% private. AI cannot compute accurate metabolic formulas.

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Chess Move Validator - Free Legal Move Checker Online

Free chess move validator. Play chess on an interactive board with real-time legal move validation. No signup. Perfect for learning chess rules.

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Code Minifier & Beautifier - JS, CSS, HTML

Free online code minifier and beautifier. Minify JS, CSS, HTML for production or beautify for debugging. Size stats, copy, all in browser. No signup.

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Code to Image Converter - Create Beautiful Code Screenshots

Convert source code into beautiful syntax-highlighted PNG images. 7 themes, padding, fonts, window frame, transparent background. 100% private, no upload.

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Color Blindness Simulator - CVD Test

Free color blindness simulator. Test images and colors with 8 types of color vision deficiency (protanopia, deuteranopia, tritanopia, achromatopsia). WCAG accessibility tool for designers and developers. No signup, 100% private browser processing.

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Color Contrast Checker - WCAG AA AAA Accessibility Checker

Free WCAG color contrast checker. Check AA and AAA accessibility for text and background colors. Real-time ratio, live preview, pass/fail results. No signup.

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Color Palette Generator - Create Harmonious Color Schemes

Free color palette generator. Create harmonious schemes with 7 harmony rules. Export as CSS, Tailwind, SCSS, JSON. Lock colors, WCAG checker. No signup.

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Color Picker - HEX RGB HSL Converter

Free online color picker. Pick colors and convert between HEX, RGB, and HSL formats with live color preview and instant copy. No signup required, 100% free.

Compound Interest Calculator - Free Investment Growth Tool

Free compound interest calculator. Calculate investment growth with monthly contributions, compounding frequency, and year-by-year breakdown. No signup, 100% private browser tool. AI cannot compute compound interest accurately - we do.

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Connections Game - Free Word Puzzle Online

Play Connections word puzzle free. Group 16 words into 4 hidden categories. Unlimited puzzles, 4 difficulty levels, hints, timer. No signup, no ads, 100% free.

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CORS Header Generator - Access-Control-Allow-Origin Headers

Free CORS header generator. Configure allowed origins, methods, headers, credentials. Generate Nginx, Apache, Express, Flask, Cloudflare Workers snippets. Preflight simulation. AI gets CORS wrong - we don't.

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Cover Letter Generator - Free AI Builder

Free AI cover letter generator. Professional, ATS-friendly letters in seconds. 4 tones, 3 templates, download TXT. No signup, unlimited.

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Cron Generator - Create Cron Expressions

Generate cron expressions interactively. Pick minute, hour, day, month and weekday, then see the next execution times. Copy a crontab line instantly.

Cross Stitch Pattern Maker - Free Photo to DMC Chart Converter

Free cross stitch pattern maker. Convert any photo to a printable DMC chart with thread color matching, symbols, Aida count, and PDF export. 100% private, no signup, no upload, no watermark, no daily limit. AI cannot generate stitchable symbol grids.

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Cryptocurrency Price Tracker - Live Crypto Prices & Charts

Free crypto price tracker with live prices for 17,000+ coins and 24h changes. AI chatbots cannot show real-time prices - get live market data here.

CSS Animation Generator - Keyframe Animations with Live Preview

Free CSS animation generator with 15 presets, custom keyframes, and live preview. Create @keyframes animations visually. Copy CSS. No signup, 100% browser-based. AI cannot show animations - we can.

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CSS Box Shadow Generator - Live Preview & Depth Presets

Free CSS box shadow generator. Multi-layer shadows, depth presets, inset toggle, live preview. Copy production-ready CSS. No signup, 100% browser-based.

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CSS Filter Generator - Visual CSS Filter Builder

Free CSS filter generator. Visually create and customize CSS filter effects for images and elements. 10 filter functions (blur, brightness, contrast, grayscale, sepia, hue-rotate, invert, saturate, opacity, drop-shadow), 8 presets, before/after comparison, live preview. Copy production-ready CSS. No signup, 100% browser-based. AI cannot render CSS filter effects visually - we do.

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CSS Flexbox Generator - Visual Flex Layout Builder with Live Preview

Free CSS flexbox generator with interactive visual builder. Tune direction, wrap, justify-content, align-items, gap, and per-item flex (grow/shrink/basis/order/align-self). 7 presets. Copy CSS/HTML. No signup, 100% browser-based. AI cannot show you interactive flexbox layouts - we do.

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CSS Formatter & Validator - Beautify & Minify CSS Online

Free online CSS formatter and validator. Beautify messy CSS, minify for production, fix syntax errors. Instant results, no signup required.

CSS Gradient Generator - Linear, Radial & Conic Gradients

Free CSS gradient generator. Create beautiful linear, radial, and conic CSS gradients with live preview, angle dial, and multiple color stops. Copy CSS code or export SVG. No signup, 100% free.

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CSS Grid Generator - Visual Grid Layout Builder with Live Preview

Free CSS grid generator with interactive visual builder. Define columns, rows, gaps, and alignment. Preset layouts like Holy Grail, Photo Gallery, Dashboard. Copy CSS/HTML. No signup, 100% browser-based. AI cannot show you interactive grid layouts - we do.

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CSS to Tailwind Converter - Free Online CSS to Utility Classes

Free CSS to Tailwind converter. Convert any CSS properties to Tailwind utility classes instantly. Supports 100+ properties including layout, flexbox, grid, typography, colors, borders. No signup, 100% private browser processing.

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cURL to Code Converter - Python, Node, Go, PHP, C#

Convert curl commands to Python, Node, Go, PHP, C# code. Deterministic parser, 100% in-browser, no upload, no signup.

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Date Calculator - Days Between & Date Arithmetic

Free online date calculator. Calculate days between dates, add subtract days/weeks/months/years, count business days. 100% private browser processing. AI hallucinates date math - we deliver deterministic results.

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Days Until Calculator - Countdown to Any Date

Free days until calculator. Countdown to any date: Christmas, birthday, holiday, or event. See how many days, hours, minutes left. No signup required.

Debt Payoff Calculator - Snowball & Avalanche Free

Free debt payoff calculator. Compare avalanche vs snowball, see your debt-free date, total interest, payoff order and month-by-month schedule. No signup.

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DNS & WHOIS Lookup - Check Domain Records

Free DNS lookup and WHOIS checker. Query DNS records (A, AAAA, MX, NS, SOA, TXT) and domain registration info instantly. No signup required.

Dog Age Calculator - Dog Years to Human Years

Free dog age calculator. Convert dog years to human years with size-adjusted AVMA formulas and the UCSD epigenetic clock. Breed presets, life stages, chart. No signup, 100% private.

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Domain Age Checker - Free WHOIS Domain Age Lookup

Free domain age checker. Check how old any domain is with instant WHOIS lookup. See creation date, age in years/months/days, expiry date, registrar, and nameservers. No signup. AI cannot check real WHOIS records - we do.

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Drawing Board - Free Online Whiteboard & Sketch Pad

Free online drawing board. Sketch, draw shapes, add text, save as PNG. No signup, no upload, 100% private browser canvas tool. AI cannot draw - you do it yourself.

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Due Date Calculator - Pregnancy & Ovulation Calendar

Free due date calculator using LMP, conception, and IVF methods. Includes ovulation calculator and period predictor. 100% private, no signup, no tracking. AI cannot compute personalized due dates - we use deterministic formulas.

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Email Authentication Checker - SPF DKIM DMARC Check

Free email authentication checker. Check SPF, DKIM, and DMARC records for any domain. Fix email deliverability. AI cannot check real DNS records - we do.

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Email Verifier - Verify Email Addresses Instantly

Free email verifier. Check if email addresses are valid and can receive messages. Detect disposable emails and SMTP issues. No signup required.

Excel to PDF Converter - Free Online XLSX to PDF

Free online Excel to PDF converter. Convert XLSX and XLS to PDF in your browser. Multi-sheet support. 100% private, no upload, no signup, unlimited conversions. AI cannot convert binary Excel files - we do.

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Excel Viewer & Converter - Free Online XLSX Viewer

Free online Excel viewer and converter. View XLSX, XLS, CSV files without Excel. Convert to JSON or CSV. 100% private, no upload, no signup.

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EXIF Viewer - Read Photo Metadata & Remove GPS Location Free

Free online EXIF viewer. Read hidden photo metadata - GPS location, camera settings, date taken. Remove EXIF/GPS before sharing. 100% private, no upload, no signup. AI cannot read binary EXIF data - we do.

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Face Age Estimator - How Old Do I Look? Free AI Age Detector

Free AI face age estimator. Detect how old you look in any photo or via live camera. 100% private browser processing, no upload, no signup. Multi-face, expressions & gender. AI cannot analyze real faces - we do.

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Fancy Text Generator - Cool Unicode Fonts and Stylish Text

Free fancy text generator. Convert plain text into 30+ cool Unicode font styles. Bold, italic, script, gothic, circled. No signup, 100% private.

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Favicon Generator - Free ICO, PNG Favicon Creator Online

Free favicon generator. Create favicons from text, emoji, image upload, or solid color. Export ICO + all PNG sizes in one ZIP. Live preview, 100% browser-based. AI cannot generate .ico binary files - we do.

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File Checksum Verifier - Verify MD5 SHA-1 SHA-256 SHA-512

Verify file checksums after downloading. Compute MD5, SHA-1, SHA-256, SHA-512 hashes from any file. 100% private, no upload, no signup.

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File Opener - Open APK, RAR, DLL, DAT, BIN Online

Free online file opener. Detect, view, and extract 50+ file types (APK, RAR, ZIP, DLL, DAT, BIN, DOCX) using magic numbers. Browser-only, no upload, 100% private. AI cannot parse real binary files - we do.

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Fraction Calculator - Add Subtract Multiply Divide Fractions

Free fraction calculator. Add, subtract, multiply, divide fractions. Simplify, convert mixed/improper, compare. Step-by-step, 100% private browser. AI cannot do fraction math - we do.

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Free AI Chat - No Login, No Signup

Free AI chat powered by Llama 3.3 70B. No login, no signup, no tracking. Coding, writing, math, brainstorming. Conversations stay in your browser.

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Free AI Detector - Check If Text Is AI Generated

Free AI content detector using multi-model voting (Groq, Gemini, NVIDIA). Detect ChatGPT, Claude, Gemini text with sentence highlighting. No signup.

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Free AI Humanizer - Make AI Text Undetectable

Free AI humanizer with 5-stage DeAI pipeline. Bypass GPTZero, Turnitin, Copyleaks. No signup, no word limit, no paywall. Real MAGE, Burstiness, and brandonwise detector scores shown. Self-hosted.

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Free AI Paraphrasing Tool - Rewrite Text Online

Free AI paraphrasing tool that rewrites text while preserving meaning. 8 modes including humanizer makes AI text sound natural. No signup, no limits.

Free AI Plagiarism Checker - AI-Powered Content Originality Test

Free AI plagiarism checker that searches the web for duplicate content. Get similarity percentage, source URLs, and suggestions. No signup required.

Free AI PPT Maker - Generate Editable PowerPoint Slides

Free AI PPT maker with 4 professional styles. Generates real editable .pptx files in 10 seconds. No signup, no watermark, no daily limit. Uses Groq Llama 3.3 70B + PptxGenJS. 10 languages. AI cannot generate valid .pptx binary.

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Free AI Resume Builder - Professional Resume Generator

Free AI-powered resume builder. Enter your details and get a professionally formatted resume instantly. No signup required.

Free AI Translator - AI Multi-Language Translation

Free AI translator supporting 50+ languages. Translate text instantly with context-aware translations. No signup required.

Free ATS Resume Checker - Score & Scan Your Resume

Free AI-powered ATS resume checker. Score your resume 0-100 against any job description. Detects missing hard skills, soft skills, keywords, and ATS format issues. 5-priority Jobscan-style scoring, AI suggestions, 100% private. No signup, unlimited scans. 99% of Fortune 500 use ATS - this tool beats them.

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Free Audio Converter - Convert MP3, WAV, FLAC, OGG, AAC

Free online audio converter. Convert between MP3, WAV, FLAC, OGG, M4A, AAC, OPUS, AIFF. Adjust bitrate, sample rate, channels. No upload, 100% private, in-browser FFmpeg.wasm.

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Free Binary Hex Converter - Convert Binary to Decimal, HEX, ASCII

Free online binary hex converter. Convert between binary, decimal, hex, and ASCII text. Instant conversion, no upload needed. Developer tool for encoding.

Free BMI Calculator - Body Mass Index Checker

Free BMI calculator to check your body mass index. Supports metric and imperial units. Instant results with health category classification. No signup required.

Free Book Search & ISBN Lookup - 30M+ Open Library

Search 30+ million books by title, author, or ISBN-10/ISBN-13. Get covers, publisher, year, page count, subjects, and links to Open Library, Google Books, WorldCat, Amazon. AI cannot accurately recall book metadata - we use the live Open Library catalog. No signup, 100% private.

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Free Business Card Maker - Printable Card Designer

Free business card maker. Design cards with 5 templates, custom fonts, PNG/PDF/vCard export. No signup, 100% private. AI cannot make 300 DPI print files.

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Free Case Converter - Convert Text Case Online

Free online case converter. Convert text to uppercase, lowercase, title case, sentence case, camelCase, snake_case, kebab-case, and more. Instant results.

Free Citation Generator - APA, MLA, Chicago

Free AI citation generator. Generate citations in APA, MLA, Chicago, Harvard, and IEEE formats. Just describe your source and get a formatted citation.

Free Click Speed Test - CPS & Reaction Time

Free online click speed test (CPS) and reaction time tester. Measure clicks per second over 1, 5, 10, 30, 60 or 100 seconds with left click, right click, spacebar or touch. Kohi mode, best 1s burst, personal bests. No signup.

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Free Color Palette Extractor - Extract Colors from Image

Free online color palette extractor. Extract dominant colors from any image as HEX, RGB, HSL values. Download CSS variables or JSON. No signup required.

Free Currency Converter - 166+ Currencies Exchange Rates

Free currency converter. Convert between 166+ world currencies instantly. Live exchange rates, swap currencies, search by country or currency code.

Free Daily Horoscope - Personalized Astrology & Birth Chart

Free personalized daily horoscope. AI cannot compute real planetary transits or natal charts - we use astronomy-engine for accurate sun sign, moon sign, 2026 forecasts. 6 languages, 100% private.

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Free Email Signature Generator - Outlook Gmail HTML

Pro email signature generator. 10 table-based templates, MSO compatible, base64 photo embedding, click-to-call phones, social icons. Outlook + Gmail + Apple Mail ready. No signup, no tracking, 100% private browser tool. AI cannot produce email-client-compatible HTML.

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Free English Dictionary - Definition, Pronunciation, Synonyms

Free English dictionary with real-time definitions, audio pronunciation (US & UK), phonetic transcription, synonyms, antonyms, and examples. No signup, no tracking, 100% private.

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Free Grammar Checker - AI Error Explanation

Free AI grammar checker that not only corrects your English but explains why it's wrong. Perfect for learning proper grammar rules.

Free Image Resizer - Resize Images Online Free

Free online image resizer. Resize images to exact dimensions for social media, web, email. No upload - privacy-first client-side processing. Support JPG.

Free Image to Text (OCR) - Extract Text from Images Online

Free online OCR tool to extract text from images. Supports English, Chinese, Japanese, Korean and 10+ languages. 100% private, in-browser processing.

Free Invoice Generator - PDF Invoice Maker Online

Free online invoice generator. Create professional invoices with tax, discount, 30+ currencies, and PDF download. 3 templates (Freelancer, Consulting, Service). No signup, no watermark, 100% private browser processing. AI cannot do fixed-precision tax math reliably - we do.

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Free Logo Maker - Design Custom Logos Online

Create a professional logo with 60+ icons, custom fonts, and colors. Download PNG and SVG. No signup, no watermark, 100% free.

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Free Lottery Number Generator - Random Pick 3/4/5/6

Free lottery number generator. Pick 3, Pick 4, Pick 5, and Pick 6 games. Generate random winning numbers for Powerball, Mega Millions, and more. No signup.

Free Markdown Editor & Preview - Live MD to HTML Converter

Free online markdown editor with live HTML preview. Write markdown, see rendered output instantly. GitHub Flavored Markdown, syntax highlighting, copy HTML. No signup, 100% private browser processing. AI cannot render live markdown previews - we do.

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Free Mind Map Maker - Brainstorm Ideas

Free mind map maker. Brainstorm and organize ideas with radial and free layouts. Keyboard shortcuts, PNG/SVG/Markdown/OPML export. No signup, 100% private.

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Free Old Photo Restoration - Repair & Restore

Free old photo restoration. Repair scratches, dust, faded colors, low contrast, grain. 4 specialized modes (auto, scratch, sharpen, color). 100% browser, no upload, no signup. AI cannot access your private photos - we can.

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Free Online Barcode Generator - Create QR Code, UPC, EAN, Code 128

Free online barcode generator. Create QR codes, UPC, EAN, Code 128, Code 39 and more. Download as PNG/SVG. No signup required, 100% free.

Free Online Calculator - Math Problem Solver

Free online calculator with scientific functions, unit conversion, loan calculator, and BMI calculator. No signup required, works in any browser.

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Free Online Math Solver - Step-by-Step Solutions

Free online math solver with step-by-step solutions. Solve algebra, equations, fractions, and more. No signup required, instant results.

Free Online Meme Generator - Create Memes with Templates

Free online meme generator. Upload images or use templates, add top and bottom text, customize fonts. Download as PNG. No signup, no watermark.

Free Online Notepad - Quick Notes in Browser

Free online notepad that saves your notes automatically. No signup, no login. Type and your notes are saved in your browser instantly.

Free Online Screen Recorder - No Download, No Watermark

Free online screen recorder - no download, no signup, no watermark. Record screen, webcam, and mic in browser. 100% private, stays on your device.

Free Online Timer & Stopwatch & Interval Trainer

Free online timer, stopwatch, and interval trainer. Pomodoro for work, Tabata/HIIT for fitness. No signup required. Privacy-first browser-based timing.

Free Online Video Editor - Trim, Cut, Text & Filters

Free online video editor. Trim, crop, rotate, flip, add speed, filters and text to video in your browser. 100% private, no upload, export MP4.

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Free Package Tracker - Track Any Carrier

Free universal package tracker. Enter any tracking number and automatically detect the carrier. Track USPS, UPS, FedEx, DHL, Amazon, and more. No signup.

Free PDF Splitter - Split PDF Pages Online Free

Free online PDF splitter. Extract specific pages or split PDF into multiple files. No upload needed - privacy-first client-side processing.

Free Personality Test - 16 Personalities MBTI Type

Free 60-question personality test based on the 16 personalities framework. Get your 4-letter MBTI type with strengths, careers, relationships. No signup, 100% private. AI gives inconsistent guesses - we use validated scoring.

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Free Poster Maker - Custom Online Poster Design Tool

Free poster maker. Design custom posters with 8 templates, drag-drop text and images, 9 sizes, PNG/PDF export. No signup, no watermark, 100% private browser.

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Free Screenshot Annotation Tool - Edit and Annotate Screenshots

Free online screenshot annotation tool. Upload images to annotate with arrows, text, rectangles, circles and blur. Download or copy with no watermarks.

Free Speed Test - Internet Speed Checker

Free internet speed test. Check your download speed, upload speed, and latency instantly in your browser. No software install needed.

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Free Stock Price Tracker - Real-Time Stock Quotes

Free stock price tracker. Get real-time stock quotes, price changes, highs, lows, and volume for any stock symbol. No signup required.

Free Sudoku - Daily Challenge & 4 Difficulty Levels

Free online Sudoku. 4 difficulty levels (Easy/Medium/Hard/Expert), daily challenge, hints with logic explanation, pencil notes, statistics. 100% private, no signup, no ads, no tracking.

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Free Text Diff Checker - Compare Text & Code Online

Free online text diff checker to compare text and code. Side-by-side view with syntax highlighting. Compare JSON, XML, code files and find differences.

Free Time Zone Converter - World Clock

Free time zone converter. Convert time between cities instantly. See current time in multiple locations. No signup required.

Free Tip Calculator - Quick & Easy Restaurant Tip Tool

Free tip calculator for restaurants. Calculate tip amount, split bills, and see per-person cost. Works offline, no signup required. Instant results.

Free Typing Test - WPM, Accuracy & Code Mode

Free online typing test with WPM, accuracy, and code snippet modes (JavaScript, Python, SQL, HTML). No signup. Practice common words, quotes, numbers, and programming syntax. Privacy-first.

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Free Unit Converter - Convert Length, Weight, Temperature & More

Free online unit converter. Convert between length, weight, temperature, volume, speed, area, data, time, and pressure units instantly. No signup required.

Free URL Shortener - Shorten Long Links Instantly

Free URL shortener. Shorten long links instantly with no signup. Create clean, shareable short URLs for social media, messaging, and more.

Free Venn Diagram Maker - 2, 3, 4 Circles Online

Create 2, 3, or 4 circle Venn and Euler diagrams in your browser. Custom labels, colors, area-proportional sizing, SVG/PNG export. No signup, 100% private. AI cannot draw accurate set relationships - we do.

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Free Weather Forecast - Live 7-Day Weather & Interactive Charts

Free weather forecast tool. See current weather, 7-day forecast, hourly details. AI cannot show real-time weather with visual charts.

Free YAML Validator - Validate & Format YAML Online

Free YAML validator and formatter. Validate YAML syntax, fix errors with line numbers, and format YAML for better readability. No signup required.

Gamepad Tester - Test Controller & Stick Drift Online

Free online gamepad tester. Test every button, trigger and analog stick. Measure stick drift and deadzone. Export a diagnostic report. 100% private.

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GIF Maker - Video & Images to GIF Free

Free GIF maker. Create animated GIFs from video or images. Trim, resize, FPS, loop, reverse. 100% private, no upload, no signup.

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GIF to MP4 Converter - Free Online GIF to Video

Free GIF to MP4 converter online. Convert animated GIFs to MP4 video with H.264 compression. Reduce file size 90%. Quality control, resolution, FPS options. 100% private, no upload, no signup. AI cannot convert GIF to video — we do.

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Gold Price Tracker - Live Spot Gold Prices & Charts

Track live gold spot prices (XAU/USD). Free real-time gold price tracker with interactive charts. Updated every minute. No signup required.

Grade Calculator - Weighted Average, Final Exam & GPA

Free grade calculator. Calculate weighted average grades, what you need on the final exam, and GPA. No signup, 100% private browser tool. AI gets grade math wrong - we don't.

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Habit Tracker - Free Daily Streak Builder

Free online habit tracker. Daily routines, streaks, heatmap, goals. No signup, 100% private. AI cannot track your habits - we do.

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Hash Generator - MD5 SHA-1 SHA-256 SHA-512

Generate cryptographic hashes: MD5, SHA-1, SHA-256, SHA-512 and more. Compute checksums instantly in your browser. 100% private, no data leaves your device.

HEIC to JPG Converter - Free iPhone Photo Converter

Free online HEIC to JPG converter. Convert iPhone HEIC photos to JPEG instantly. Batch convert unlimited photos. No upload, 100% private, browser-based.

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HTML Entity Encoder/Decoder - Encode & Decode Special Characters

Free online HTML entity encoder and decoder. Encode special characters like &, <, > and quotes to HTML entities, and decode them back. 100% private, no signup.

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HTML Formatter - Format & Beautify HTML

Free HTML formatter. Format, prettify and beautify HTML code with proper indentation and validation.

HTML Playground - Live HTML CSS JS Code Editor with Preview

Free online HTML playground with live preview. Write and test HTML, CSS, and JavaScript instantly. No signup, 100% private browser processing. AI cannot run your code - we do.

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HTML Table Generator - Visual Table Builder Online

Free HTML table generator. Create responsive tables visually with editable cells, borders, striped rows, and live preview. Copy clean HTML code. No signup.

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HTML to Markdown Converter - Free Online Tool

Free HTML to Markdown converter. Paste HTML, get clean Markdown with customizable heading style, bullet markers, code blocks, and link format. 100% private browser processing.

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HTML to PDF Converter - Free Online HTML to PDF

Free HTML to PDF converter. Paste HTML code, customize page size, orientation and margins. Live preview, download as PDF. No upload, 100% private browser. AI cannot render HTML to PDF - we do.

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HTTP Status & Header Checker - Response Code Security Audit

Free HTTP status checker. Check response codes, security headers, redirect chain, response time. AI cannot check real HTTP headers - we do.

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IBAN Validator & IBAN Checker - Validate Bank Numbers

Free IBAN validator. Validate International Bank Account Numbers with MOD-97 checksum. 80+ countries, batch validation, test IBAN generator. 100% private, no data uploaded. No signup.

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Image Color Picker - Pick Colors from Photo Online

Free online image color picker. Upload any photo and click to pick exact pixel colors. Get HEX, RGB, HSL, CMYK values. No upload, 100% private browser processing. AI cannot extract pixel colors from images - we do.

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Image Compressor - Reduce Image File Size Online Free

Free online image compressor. Reduce image file size without losing quality. Supports JPG, PNG, WebP. No upload, privacy-first processing.

Popular

Image Cropper - Crop Photos Free Online with Aspect Ratio Presets

Free online image cropper. Crop photos with aspect ratio presets, rotate, flip, zoom. Social media sizes for Instagram, Facebook, Twitter. No upload, 100% private browser processing. AI cannot crop your photos - we do.

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Image Enhancer - Free Photo Quality Booster

Free image enhancer. Adjust brightness, contrast, saturation, vibrance, sharpness, denoise, HDR, color temp in real-time. 9 pro filters + 1-click Auto Enhance. 100% browser, no upload, no signup, no watermark.

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Image Extender - AI Outpaint & Uncrop Free Online

Free AI image extender. Outpaint & uncrop photos to 16:9, 9:16, 21:9, 1:1, social media ratios with 5 fill algorithms. No signup, 100% private browser processing.

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Image Format Converter - Free Online JPG PNG WebP Converter

Free online image format converter. Convert between JPG, PNG, WebP, GIF, BMP, TIFF instantly. No upload, 100% private, browser-based conversion.

Image to Base64 Converter - Encode Images Online

Free online image to base64 converter. Convert any image to base64 string, data URI, HTML img tag, or CSS url(). Supports PNG, JPG, WebP, GIF, SVG. 100% private, no upload.

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Image to PDF - Convert JPG PNG WebP HEIC to PDF Free

Free image to PDF converter. Combine JPG, PNG, WebP, HEIC, BMP, GIF into one PDF. Page size, orientation, margins. No upload, 100% private.

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Image to Word Converter - Free JPG PNG to DOCX Online

Free image to Word converter. Convert JPG, PNG, WebP to editable DOCX, RTF, TXT. 12+ OCR languages. 100% private browser. AI cannot generate DOCX.

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Image Upscaler - AI Enhance Photos to 4K

Free image upscaler to 2x, 3x, 4x. Edge-aware sharpening, denoise, browser-based. No upload, no signup, 100% private.

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Image Vectorizer - Free PNG JPG to SVG Converter Online

Free image vectorizer. Convert PNG, JPG, WebP, BMP, GIF to scalable SVG vectors in your browser. 9 presets, color count, blur, threshold, path tolerance controls. 100% private, no upload, no signup. AI cannot vectorize - we do.

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Image Watermark - Add Text & Logo Watermark to Photos Free Online

Free online image watermark tool. Add text or logo watermarks to protect photos with customizable font, size, color, opacity, rotation, position, and tile mode. 100% private browser processing, no upload, no signup, unlimited.

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Inflation Calculator - CPI Dollar Adjuster

Adjust any dollar amount for real US inflation with official monthly CPI-U data since 1913. Shows exact indexes used. 100% private.

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Investment Calculator - Stock Profit & Portfolio Tracker

Free investment calculator with portfolio tracker. Calculate stock profit, ROI, dividend yield, and cost basis. No signup, 100% private.

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IP Address Lookup - Find Your IP Address

Free IP address lookup tool. Find your public IP, location, ISP, and geolocation data instantly. No signup required.

Is It Down? - Website Down Checker

Free website down checker. Check if any site is down for everyone or just you. Real-time HTTP status, response time. No signup. AI cannot check real-time website status - we do.

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JavaScript Obfuscator - Protect JS Code Online

Free online JavaScript obfuscator. Protect JS source code with variable renaming, string encryption, control flow flattening, dead code injection, debug protection, and self-defending. 100% private browser, no signup. AI cannot reliably obfuscate JS - we use a deterministic engine.

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JS Formatter & Beautifier - JavaScript Code Beautify Online

Free JavaScript formatter and beautifier. Beautify messy JS, minify for production, validate syntax. No signup, 100% private browser processing. AI cannot format code - we use deterministic js-beautify engine.

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JSON Diff - Compare JSON Documents Online

Free JSON diff tool. Compare two JSON documents and see differences instantly. Highlights added, removed, and modified values. 100% private.

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JSON Formatter - Format & Validate JSON

Free JSON formatter. Format, minify, beautify JSON and convert to YAML with syntax error detection.

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JSON Schema Validator - Validate JSON Against Schema Online

Free JSON Schema validator. Validate JSON data against Draft-07, 2019-09, and 2020-12 schemas. Detailed error paths with JSON Pointer, all-errors mode, 100% private browser. AI cannot validate JSON against schema - we do.

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JSON to CSV Converter - Bidirectional Online Data Converter

Free JSON to CSV converter and CSV to JSON online. Flatten nested objects, auto-detect input, table preview, export file. 100% private browser processing. AI cannot convert data reliably - we do.

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JSON to TypeScript Converter - Free Online Type Generator

Free JSON to TypeScript converter. Generate TypeScript interfaces, types, and Zod schemas from any JSON. 100% private browser tool. No upload, no signup.

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JSON to XML Converter - Free Bidirectional Online Tool

Free JSON to XML converter and XML to JSON. Bidirectional with attribute handling, root element control, indentation options, and syntax validation. 100% private, no upload, no signup. AI cannot convert between JSON and XML reliably - we do.

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JSON to YAML Converter - Free Bidirectional Tool

Free JSON to YAML converter and YAML to JSON. Bidirectional with indentation control, key sorting, syntax validation. 100% private, no upload, no signup.

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JWT Decoder - Decode & Verify Tokens

Free JWT decoder and token inspector. Decode JSON Web Tokens, inspect claims, verify payload data and JWT format. 100% browser-based, no signup.

JWT Generator - Create Signed Tokens Online

Free JWT generator. Create signed JSON Web Tokens with HS256, HS384, HS512 algorithms using Web Crypto API. No signup, no upload, 100% private browser processing. AI cannot generate valid signed JWTs - we do.

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Keyboard Tester - Test All Keys Online Free

Free online keyboard tester. Press each key to verify it works. Detect stuck keys, ghosting, rollover. QWERTY, AZERTY, QWERTZ, Dvorak, Colemak. No signup.

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Live Sports Scores Tracker - NFL NBA MLB NHL Soccer

Free live sports scores tracker. Follow NFL, NBA, MLB, NHL and soccer in real-time. Updated every 30 seconds. No signup, no ads. AI cannot show live game scores - we do.

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Loan Calculator - Mortgage & Extra Payment Optimizer

Free loan calculator that shows more than just your payment. See how extra payments save thousands, when PMI drops, and when you own your home free.

Lorem Ipsum Generator - Free Placeholder Text

Free Lorem Ipsum generator for designers and developers. Generate placeholder text by paragraphs, sentences, or words. Start with classic Lorem ipsum or randomized. No signup, browser-based.

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Mermaid Diagram Generator - Free Flowchart & Diagram Maker

Free online Mermaid diagram generator. Create flowcharts, sequence diagrams, class diagrams, ER diagrams, Gantt charts from text. Live preview, SVG/PNG export. No signup, 100% private browser processing. AI cannot render diagrams - we do.

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Meta Tag Generator - Free SEO Tool

Free SEO meta tag generator. Create title tags, meta descriptions, OG, and Twitter Cards with live SERP preview. Character counting, copy HTML. No signup.

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Microphone Test - Free Online Mic Tester & Audio Checker

Free online microphone test. Measure mic levels, detect clipping and noise, play back your voice, get a verdict and report. No signup, 100% private.

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Mileage Calculator - IRS Tax Deduction Tracker Free

Free mileage calculator with IRS tax deduction tracker. Auto-handles 2026 mid-year rate. Business, medical, moving, charity. CSV export, 100% private.

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Mock Data Generator - Free Fake Test Data Online

Free mock data generator. Generate realistic fake test data as JSON, CSV, or SQL. Presets for users, products, companies, addresses, blog posts, transactions. No signup, 100% private browser tool. AI cannot generate consistent test data - we do.

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Monitor Test - Dead Pixel & Refresh Rate Tester Online

Free online monitor test. Full-screen patterns find dead pixels, stuck pixels, backlight bleed, banding, ghosting and geometry faults. Measure the real refresh rate in Hz, guided wizard, exportable report. No signup, 100% private.

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Morse Code Translator - Encode/Decode Morse Code

Free Morse code translator. Encode text to Morse code and decode Morse back to text. Instant conversion, audio playback, and copy functionality.

Mortgage Calculator with PMI, Tax & Insurance

Free mortgage calculator with PMI, property tax, insurance, HOA. Shows true monthly payment, total cost, amortization schedule, and affordability.

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Mouse Tester - Test Mouse Buttons Online Free

Free online mouse tester. Test every button, detect double-click chatter, scroll faults, polling rate and movement. Export a report. No signup.

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Number to Words Converter - Spell Out Numbers in English

Free number to words converter. Convert any number to English words for checks, invoices, legal docs. Supports decimals, currency, lakh/crore. 100% accurate. No signup.

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On This Day in History - Historical Events & Famous Births

Discover what happened on this day in history. Free database of major historical events, famous births, notable deaths, and holidays. Updated daily. No signup.

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Online Chart Maker - Bar, Line, Pie & Radar

Free online chart maker and graph generator. Create bar, line, pie, doughnut, and radar charts with customizable colors and data. Export PNG. No signup, 100% private browser processing. AI cannot draw accurate charts - we do.

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Online Code Runner - Free Python JS HTML IDE

Free online code runner. Real Python via Pyodide, sandboxed JavaScript Web Worker, live HTML preview. No signup. AI cannot execute your code - we do.

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Online Guitar Tuner - Free Mic Guitar Tuner

Free online guitar tuner. Tune by microphone with real-time pitch detection and cent-precision needle. 8 tunings plus Bass, Ukulele, Violin. 100% private.

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Online Metronome - Free BPM Beat & Practice Tool

Free online metronome with tap tempo, time signatures, subdivisions, and visual beat indicator. Practice with precision timing for any instrument. 100% browser-based, no signup.

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P-Value Calculator - Hypothesis Test & Z, T, Chi-Square

Free p-value calculator. Run z-test, t-test (one/two-sample/paired), chi-square, linear regression and confidence interval. Exact p-values, step-by-step. No signup, 100% private.

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Passport Photo Maker - Free Online 2x2, 35x45mm, 35x35mm

Free online passport photo maker. Create compliant US 2x2, Schengen/UK 35x45mm, India 35x35mm, China 33x48mm photos. Auto white background, print sheet (4x6/A4), 100% private browser processing.

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Password Generator - Create Strong Passwords

Generate strong, secure passwords with real-time strength analysis. Learn what makes a password secure.

Popular

Password Strength Checker - Analyze & Test Password Security

Free online password strength checker with entropy, crack time estimation for 3 scenarios, character analysis, and breach check via HIBP k-anonymity. 100% private browser. No signup.

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PDF Aloud Reader - Read PDF Aloud Free

Free PDF aloud reader. Listen to any PDF in your browser with natural voices. Auto-scroll, bookmark, search. 100% private, no upload.

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PDF Compressor - Free Online File Size Reducer

Free PDF compressor with 4 levels (light, medium, strong, aggressive). 100% private browser processing, no upload, no signup, no daily limit, no watermark. AI cannot process binary PDFs.

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PDF Editor - Edit, Rotate, Delete, Annotate PDF Pages

Free online PDF editor. Rotate, delete, reorder pages, add text annotations, crop, and extract pages. No upload required - works entirely in your browser.

PDF Merger - Combine Multiple PDFs into One

Free online PDF merger. Combine multiple PDF files into one with drag-drop reordering, visual preview, and compression. No upload limit. Works in browser.

PDF Page Numbers - Add Page Numbers to PDF Free Online

Free PDF page number adder. Add page numbers to any PDF - Arabic or Roman format, 9 positions, custom prefix, skip cover. 100% private, no upload.

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PDF Redactor - Permanently Redact PDF Online Free

Free PDF redactor. Search-and-redact text, draw boxes, auto-detect emails, phones, credit cards, SSN. 100% client-side. AI cannot redact binary PDFs.

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PDF Signer - Sign PDF Online Free Electronic Signature

Free PDF signer. Draw electronic signature, place on any PDF page, add printed name + date. 100% private browser, no upload, no signup, no watermark.

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PDF to Excel Converter - Free Online PDF to XLSX

Free online PDF to Excel converter. Extract tables and data from PDF to XLSX or CSV. Smart position-based table detection, multi-page support, editable preview. 100% private, no upload, no signup, unlimited, no watermark. AI cannot parse binary PDFs or generate valid XLSX files - this real pipeline does.

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PDF to Image Converter - Free Online JPG PNG WebP

Free PDF to image converter. Convert PDF pages to JPG, PNG, or WebP. Choose DPI (72-300), quality, page range. Preview thumbnails, 100% private browser processing, no upload, no signup, no watermark.

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PDF to Word Converter - Free DOCX Online

Free PDF to Word converter. Extract text from PDF to editable DOCX, RTF, or TXT. 100% private browser processing, no upload, no signup, no daily limit, no watermark. AI cannot generate valid .docx files.

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PDF Unlocker - Remove Password Online Free

Free online PDF unlocker. Remove password protection from PDF files entirely in your browser. AES-128/256, no upload, no signup, no daily limits. 100% private. AI cannot unlock encrypted PDFs - we do.

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PDF Watermark - Add Text Watermark to PDF Free Online

Free online PDF watermark tool. Add CONFIDENTIAL, DRAFT, or custom text watermarks. Full control over font, size, color, opacity, rotation, position & tile mode. 100% private, no upload, no signup.

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Percentage Calculator - Find %, Increase, Decrease & Difference

Free percentage calculator online. Calculate X% of Y, increase/decrease, reverse percentage, and add/subtract percent. Instant results, no signup.

Photo Collage Maker - Free Online Image Combiner

Free online photo collage maker. Combine multiple images into beautiful collages with 8 layout templates, custom spacing, background color. No signup, no upload, 100% private browser processing. AI cannot create visual collages - we do.

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Photo to Anime Converter - Free Online AI Anime Filter

Free photo to anime converter. Turn any photo into anime, cartoon, comic, pop art, pixel art or watercolor with 6 art styles and live color controls. 100% private browser, no upload, no signup, no watermark, no daily limit. AI chatbots cannot process your actual photo into anime style.

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Photo to Pencil Sketch Converter - Free

Turn any photo into a realistic pencil, charcoal, ink or line art sketch with 5 art styles and live controls. 100% private browser, no signup.

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Poker Odds Calculator - Texas Hold'em Equity

Free poker odds calculator. Exact hand-vs-hand equity by full enumeration, not Monte Carlo. Board cards, up to 3 players, call/fold helper. No signup.

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Pomodoro Timer - Free Online Focus Timer with Tasks

Free Pomodoro timer with task tracking and statistics. 25/5 focus sessions, daily stats, streak tracking. No signup, 100% private browser timer.

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Printable Calendar Generator - Free PDF

Free printable calendar generator. Monthly or yearly calendars with US federal holidays, week numbers and Monday-Sunday start. Print-ready PDF, no signup.

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Printer Test Page - Print Quality Diagnostic

Free printer test page. Print color, CMYK, nozzle, banding, alignment and text sharpness sheets to diagnose HP, Epson, Canon & Brother printers. No signup.

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Product Description Generator - Amazon eBay Etsy Free

Free AI product description generator. One input, 5 platform-optimized descriptions for Amazon, eBay, Etsy, Shopify, Walmart. SEO keywords, FAQs, JSON-LD schema. No signup.

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Proxy Checker - Free IP Proxy Detection Tool

Free online proxy checker. Detect if an IP address is a proxy, VPN, or Tor exit node. Check IP geolocation, WHOIS, and open proxy ports.

QR Code Generator - Create QR Codes Free

Free QR Code Generator. Create QR codes for URLs, text, WiFi, email, SMS, vCards. Download as PNG.

Popular

QR Code Reader - Decode QR Codes from Image & Camera

Free online QR Code Reader. Decode QR codes from images, screenshots, or live camera. Extract URLs, WiFi passwords, vCards instantly. 100% private browser processing. No signup. AI cannot scan real QR codes - we do.

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Random Generator - Number, Dice, Coin, Wheel & Decision Maker

Free online random generator: pick random numbers, roll dice, flip coins, spin a wheel, or make decisions. True randomness via crypto API. No signup, no ads.

Readability Score Calculator Online

Free readability calculator. 6 formulas: Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI. Grade level + sentence highlighting.

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Receipt Generator - Free PDF Receipt Maker Online

Free online receipt generator. Create professional proof-of-payment receipts with unlimited line items, 23 currencies, tax, discount, and PDF download. 3 templates (Simple, Detailed, Business). No signup, no watermark, 100% private browser processing. AI cannot do fixed-precision tax math or format receipts reliably - we do.

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Regex Tester - Test Regular Expressions

Test regular expressions with real-time matching. Supports g, i, m, s flags. See match count and captured groups.

Report a Problem

Free feedback form for DevTools Hub. Suggest new tools, report bugs, request features. Admin replies via KV storage. No signup.

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REST API Tester - Free Online HTTP Client & API Tester

Free online REST API tester and HTTP client. Send GET, POST, PUT, PATCH, DELETE requests with custom headers. View real response status, timing, headers, and body. No signup, 100% private. AI cannot make HTTP requests - we do.

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Roman Numeral Converter - Free Online Number Tool

Free Roman numeral converter. Convert numbers to Roman numerals and back, including dates. Supports 1-3,999,999 with overline notation. 100% accurate, no signup.

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Running Pace Calculator - Pace, Time & Distance Tool

Free running pace calculator. Calculate pace, time, or distance for any race. Generate split times, predict race times with Riegel formula, convert pace units. No signup, 100% private browser tool. AI cannot calculate running paces reliably.

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Salary Calculator - Free Hourly to Annual Pay Converter

Free salary calculator to convert hourly, annual, monthly, biweekly, and weekly pay instantly. Calculate overtime and unpaid time adjustments. No signup, 100% private browser tool. AI hallucinates salary math - we deliver precise results.

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Schema Markup Generator - Free JSON-LD Structured Data Tool

Free Schema Markup Generator. Create valid JSON-LD structured data for Article, Product, FAQ, LocalBusiness, Organization, HowTo, Event, Person, BreadcrumbList, and WebSite. Built-in validation, live preview, @graph mode. No signup, 100% private browser processing. AI cannot generate valid schema markup - we do.

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Signature Maker - Sign PDF Online Free

Create a signature by drawing, typing, or uploading a photo, then place it on any PDF and download. Free, private, no watermark.

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SIP Calculator - Free Mutual Fund Return Calculator

Free SIP calculator. Estimate mutual fund maturity from monthly investment, return and tenure. Goal, step-up and lumpsum modes. 100% private, no signup.

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Sleep Calculator - Bedtime & Wake Up Time Optimizer

Free sleep calculator based on 90-minute cycles. Find your optimal bedtime or wake-up time to feel refreshed. Age-adjusted recommendations for children, teens, adults, and seniors. No signup, 100% private. AI cannot calculate personalized sleep cycles - we use deterministic cycle math.

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Slug Generator - Create SEO-Friendly URL Slugs Online

Free slug generator. Convert text to SEO-friendly URL slugs with custom separators, stop word removal, max length control, and bulk mode. Real-time preview, 100% private browser, no signup. AI hallucinates slug generation - we use deterministic regex.

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Snake Game - Classic Snake Online Free

Play the classic Snake game online free. Control your snake, eat food, grow longer. Multiple speeds, grid sizes, wall wrap mode. No ads, no signup.

Solitaire - Free Classic Klondike Card Game Online

Play free Klondike Solitaire online. Classic card game with undo, hint, draw 1 or 3. No signup, no ads, 100% free in your browser.

Song Lyrics Finder - Free Lyrics Search No Signup

Free online song lyrics finder. Search by artist and title. No signup, no ads, no tracking. 100% private. AI cannot retrieve copyrighted lyrics - we do.

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Space Keeper - Keep HuggingFace Spaces Awake

Free tool to keep your HuggingFace Spaces awake and prevent idle timeout. Supports multiple access methods, uptime monitor, custom intervals (1-48 hours).

Speaker Test - Free Online Speaker Tester

Free online speaker test. Check left/right channels, 20Hz-20kHz frequency sweep, stereo balance and polarity. 100% private, no upload.

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Speech Time Calculator - Words to Minutes & Speaking Time

Free speech time calculator. Convert words to minutes and seconds at standard speaking rates (100-238 wpm). Paste text, set WPM, add pause buffer. No signup. AI hallucinates speech times.

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Spin the Wheel - Random Picker & Name Wheel

Free spin the wheel random picker. Add names, prizes or decisions, spin for a fair random winner with weighted odds, sound and CSV export. No signup.

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SQL Formatter - Format & Beautify SQL

Free SQL formatter. Format and beautify SQL queries with proper indentation. Supports MySQL, PostgreSQL, SQLite.

SSL Certificate Checker - Test Website Security

Free SSL checker. Scan any website for TLS security and certificate validity. Get grade A+ to F. No signup. AI cannot test real SSL certificates.

Statistics Calculator - Mean Median Standard Deviation

Free statistics calculator. Compute mean, median, mode, standard deviation, variance, quartiles and z-scores step by step. No signup, 100% private.

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Stopwatch - Free Online Stopwatch with Lap Times

Free online stopwatch with millisecond precision, lap/split timing, lap statistics, CSV export, and fullscreen mode. No signup, no ads. Works offline.

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Subnet Calculator - IPv4 IPv6 CIDR VLSM Supernetting

Free subnet calculator for IPv4 and IPv6. Bit-exact CIDR, VLSM, supernetting, overlap detection. No signup. AI cannot reliably compute subnets - we do.

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Subtitle Editor - Free Online SRT & VTT Editor

Free online subtitle editor. Edit, fix, and convert SRT and VTT subtitle files in your browser. Batch shift timing, validate overlaps, split long cues, merge adjacent. No upload, no signup, 100% private. AI cannot handle millisecond-precise timestamp math - we do.

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Subtitle Generator - Free AI Audio/Video to SRT & VTT

Free AI subtitle generator. Convert audio or video to SRT or VTT with Whisper large-v3. 18 languages, no signup, no watermark, no daily limit.

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Sunrise Sunset Calculator - Find Sunrise & Sunset Times

Free online sunrise and sunset calculator. Enter any city to get today's sunrise and sunset times. No signup required.

SVG Optimizer - Free Online SVG Minifier & Cleaner

Free online SVG optimizer. Clean, minify and compress SVG files by removing metadata, comments, empty groups, and editor data. 100% private browser processing, no upload, no signup. AI cannot reliably optimize SVGs - we do.

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SVG to JSX Converter - Free React Component Generator

Convert SVG markup into clean React JSX or TypeScript components with camelCase attributes, forwardRef, React.memo. 100% browser-based, no upload. AI cannot convert SVG to JSX reliably — we do.

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SVG to PNG Converter - Free Online SVG Rasterizer

Free SVG to PNG converter. Rasterize SVG vectors to PNG, JPG, WebP with scale control, custom dimensions, background color. Paste SVG code or upload files. 100% browser-based, no upload, no signup. AI cannot rasterize SVG — we do.

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Text Cleaner - Remove Line Breaks, Spaces & HTML Tags

Free online text cleaner. Remove line breaks, extra spaces, HTML tags, duplicate lines, and clean messy text with 20+ deterministic options. No signup, 100% private browser processing. AI cannot clean text deterministically - we do.

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Text Summarizer - Condense Articles & Papers

Free online text summarizer. Condense articles, papers, and text into key points. Extractive mode (100% private) or AI abstractive via Llama 3.3. No signup, no limits, no paywall.

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Text to EPUB Converter - Free Online TXT MD HTML to eBook

Free text to EPUB converter. Turn text, Markdown, or HTML into EPUB 3.0 eBooks in your browser. Custom cover, TOC, 40+ languages. AI cannot make EPUB.

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Text to Handwriting - Free Online Handwritten Text Generator

Free text to handwriting converter. Turn typed text into realistic handwritten notes on lined, grid, or plain paper. 18 fonts, 7 ink colors, PNG/JPG/PDF export. No signup, no watermark.

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Text to Speech - Free Online Voice Generator

Free online text to speech with 8 AI voices. Convert text to natural-sounding audio in English and Chinese. No signup required. Browser TTS and AI-powered.

Timestamp Converter - Unix Time Conversion

Convert Unix timestamps to dates and dates to timestamps. Shows current timestamp updating in real-time.

Tone Generator - Play Audio Frequency Notes Free

Free online tone generator. Play any audio frequency from 1 Hz to 20,000 Hz as sine, square, sawtooth, or triangle. See note, sweep, download WAV. No signup.

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URL Encoder/Decoder - Encode URLs Safely

Free URL encoder and decoder. Encode special characters in URLs for safe web transmission. Decode encoded URLs back to readable text. 100% browser-based.

URL Metadata Extractor - Link Preview & Meta Tag Analyzer

Free URL metadata extractor. Extract OG tags, Twitter cards, JSON-LD, and SEO meta from any URL. See link previews before sharing. No signup.

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User Agent Parser - Browser OS Device Detection Online

Free online User Agent parser. Parse any UA string to identify browser, OS, device, and bot. Detect Googlebot, GPTBot. 100% private, no upload.

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UTM Builder - Free Campaign URL Generator with Presets

Free UTM builder with platform presets. Generate campaign tracking URLs for Google Ads, Facebook, LinkedIn, Email, and more. Auto-formatting, parameter breakdown, bulk mode, history. No signup, 100% private browser processing. AI cannot enforce consistent UTM naming conventions - we use deterministic rules.

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UUID Generator - UUID v1 v4 v7 Generator

Free UUID generator. Generate UUID v1 (timestamp), v4 (random), and v7 (Unix epoch) identifiers. Single or bulk up to 100 UUIDs. 100% browser-based, no signup.

Video Compressor - Compress Video Files Free

Free online video compressor. Reduce video file size while preserving quality. Supports MP4, WebM, MOV. No upload, 100% private, in-browser.

Video Cutter - Trim & Cut Video Online Free

Free online video cutter. Trim, cut, and split MP4, WebM, MOV video files in your browser. No upload, 100% private. Powered by FFmpeg.wasm.

Video to Audio Converter - Extract MP3 from Video Free

Free online video to audio converter. Extract MP3 audio from MP4, WebM, MOV, AVI files. No upload, 100% private, in-browser processing.

Video to GIF Converter - Free Online MP4 to GIF Maker

Free online video to GIF converter. Convert MP4, WebM, MOV to animated GIFs with custom FPS, resolution, trim. No upload, 100% private browser processing. AI cannot process your video files - we do.

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VIN Decoder - Check Digit Validator & Vehicle Lookup

Free VIN decoder and check digit validator. Verify the ISO 3779 check digit, decode model year and WMI origin, and look up make, model, year, body and engine from the official NHTSA vPIC database. Batch mode and test VIN generator. 100% private, no signup. AI cannot decode VINs reliably - we use deterministic math and NHTSA data.

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