Developer tools that work.
281 free utilities for code formatting, file conversion, calculations, AI assistance, and more. No signup, no upload, no tracking.
Popular Tools
8 most-usedAnagram 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.
NewFree 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.
NewFree 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.
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.
NewColor 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.
NewFree 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.
NewIBAN 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.
NewPoker 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.
NewRecently Updated
2 toolsAudio Cutter & Trimmer
Free online audio cutter and trimmer. Cut and trim MP3, WAV, M4A, FLAC, OGG with waveform precision. No upload, 100% private.
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.
NewBrowse by Category
11 categoriesView all 281 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.
NewAge 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.
NewAI 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.
NewAI 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.
NewAI 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.
NewAnagram 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.
NewASCII 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.
NewAspect 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.
NewAstronomy 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.
NewAudio 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.
NewAudio 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.
NewAudio 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.
NewAudio 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.
NewAudio 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.
NewBackground 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.
NewBase64 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.
NewBingo 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.
NewBody 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.
NewCalorie 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.
NewChess 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.
NewCode 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.
NewCode 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.
NewColor 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.
NewColor 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.
NewColor 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.
NewColor 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.
NewConnections 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.
NewCORS 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.
NewCover 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.
NewCron 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.
NewCryptocurrency 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.
NewCSS 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.
NewCSS 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.
NewCSS 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.
NewCSS 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.
NewCSS 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.
NewCSS 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.
NewcURL 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.
NewDate 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.
NewDays 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.
NewFrequently Asked Questions
Are all 281 developer tools really free?
Yes — every tool on DevTools Hub is 100% free with no signup, no trial, no daily limit, and no watermark. The site is supported by optional cloud functions and ad-free by design.
Do you upload my data to a server?
Most tools process everything in your browser. Only AI-backed tools (AI Chat, AI Detector, Image Generator, Story Animator, Translator, Paraphrasing Tool, Plagiarism Checker, Resume Builder, Cover Letter Generator, Citation Generator, ATS Resume Checker, AI Humanizer, Text-to-Speech, Text-to-Video, Text Summarizer, Math Solver, Grammar Checker, Subtitle Generator, and a few others) call a server API for GPU compute. Uploads are transient and never logged. Each tool page documents exactly what leaves your device.
Why use these tools instead of asking an AI chatbot?
AI chatbots hallucinate exact arithmetic, produce invalid JSON/XML, drop SVG attributes, and cannot compute dates, fractions, or compound interest reliably. DevTools Hub uses deterministic code — same input always yields the same verified output.
Do I need to create an account?
No account, no email, no tracking cookies. Open any tool, use it, close the tab. Your inputs never leave your browser unless you explicitly call a cloud-backed AI tool.
How often are new tools added?
New tools ship 2-3 times per week. The homepage shows a 281 tool count that updates automatically as new entries are added to the public manifest. See the sitemap.xml for the complete list.
Can I use these tools commercially?
Yes. The outputs you generate belong to you — use them in client work, internal tools, or commercial products without attribution. The tool code itself is MIT-licensed on GitHub.