Developer tools that work.
373 free utilities for code formatting, file conversion, online calculators, AI assistance, and more. No signup, no upload, no tracking.
Popular Tools
8 most-usedFree AI Chat - No Login, No Signup
Free AI chat powered by Groq and NVIDIA models. No login, no signup, no tracking. Coding, writing, math, brainstorming. Conversations stay in your browser.
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.
Condom Size Calculator - Find Your Exact Fit
Free condom size calculator. Enter girth and length in mm, cm or inches to get your nominal width range and a fit verdict for any condom. 100% private.
Free Online Calculator - Scientific, Percent, BMI & Loan
More than a phone keypad: scientific functions, percent, loan payments and BMI in metric and imperial units. Free to use, no signup.
Free Email Signature Generator - Outlook Gmail HTML
Free email signature generator. 10 table-based templates, MSO compatible, base64 photo embedding, click-to-call phones, social icons. 100% private.
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.
Image Cropper - Crop Photos with Aspect Ratio
Free online image cropper. Crop with aspect ratio presets, rotate, flip and zoom. Social media sizes for Instagram, Facebook and Twitter. No upload.
JSON Formatter - Format & Validate JSON
Free JSON formatter. Format, minify and beautify JSON, convert to and from YAML, and get the exact line of any syntax error. 100% browser, no upload.
Recently Updated
6 toolsCSS Specificity Calculator - Compute Selector Weight
Free CSS specificity calculator. Compute a,b,c values for any selector instantly. Understand selector weight and cascade priority. No signup.
NewHeart Rate Zone Calculator - 5 Zones by Age
Free heart rate zone calculator. Enter your age to get all five training zones in bpm, compare four max HR formulas, and find your personal Zone 2 range.
AI Code Reviewer - Free Online Code Review
Free AI code reviewer. Paste code, get instant review for bugs, performance, security, and best practices. No login, private.
NewPDF to Text Extractor - Free Online PDF Text Reader
Free PDF to text extractor. Extract plain text from any PDF in your browser. No upload, no signup, 100% private. Copy or download results.
NewMarkdown to PDF Converter - Free Online MD to PDF
Free online MD to PDF converter. Convert markdown to PDF instantly in browser. Preserve formatting, headings, code blocks, tables. No signup, 100% private.
NewKeyword Suggestions Generator - Free SEO Keyword Research
Free keyword suggestions from Google and Bing autosuggest. Expand one seed into 20 live search ideas, compare both engines, and copy the list. No signup.
NewBrowse by Category
11 categoriesView all 373 tools (alphabetical)
EXIF Viewer - Photo Metadata and GPS Location
Free online EXIF viewer. Read hidden photo metadata including GPS location, camera settings, date taken. Remove EXIF data before sharing. 100% private.
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.
Favicon Generator - Free ICO, PNG Favicon Creator Online
Free favicon generator. Create favicons from text, emoji, an image or a solid color. Export ICO plus every PNG size in one ZIP. Live preview, 100% browser.
PopularFeedback - Report a Bug or Suggest a Tool
Report a bug, a wrong result, or suggest a missing tool on DevTools Hub, the free online developer tools. Your feedback helps us fix and improve our tools.
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 browser processing, no upload.
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.
PopularFlashcard Maker - Free Spaced Repetition Study Cards
Free flashcard maker with spaced repetition. Create unlimited decks, paste CSV/tab lists, study with Again/Hard/Good/Easy grading, track accuracy.
Fraction Calculator - Add, Subtract, Multiply & Divide
Free fraction calculator. Add, subtract, multiply, divide fractions. Simplify, convert mixed numbers, compare fractions. Step-by-step solutions. No signup.
Free AI Chat - No Login, No Signup
Free AI chat powered by Groq and NVIDIA models. No login, no signup, no tracking. Coding, writing, math, brainstorming. Conversations stay in your browser.
PopularFree AI Content Writer - Generate SEO Blog Posts
Free AI content writer that generates complete SEO blog posts: outline, title, meta description, body draft and FAQ. No signup, private.
NewFree AI Humanizer - Make AI Text Undetectable
Free AI humanizer with a 5-stage DeAI pipeline. Bypass GPTZero, Turnitin and Copyleaks. Real MAGE, Burstiness and brandonwise scores shown. No word limit.
PopularFree 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 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, 10 languages.
PopularFree AI Prompt Engineer - 8 Platforms 88 Templates Sandbox
Free AI prompt engineer. 88 ready-to-use prompts for ChatGPT, Claude, Midjourney, DALL-E, Stable Diffusion, Gemini, Llama, Copilot. Live test sandbox.
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 Sentence Rewriter - 8 Modes Side-by-Side
Free AI sentence rewriter. 8 modes (standard, fluency, formal, simple, creative, expand, shorten, humanize) with side-by-step sentence comparison.
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 ATS resume checker. Score your resume 0-100 against any job description, with missing skills, keywords and format issues flagged. Unlimited scans.
PopularFree Audio Converter - Convert MP3, WAV, FLAC, OGG, AAC
Free online audio converter. Convert between MP3, WAV, FLAC, OGG, M4A, AAC, OPUS and AIFF. Adjust bitrate, sample rate and channels. 100% private.
PopularFree BMI Calculator - Body Mass Index Checker
Free BMI calculator to check your body mass index. Metric and imperial units, instant results with health category. No signup required.
Free Book Search & ISBN Lookup - 30M+ Open Library
Search 30+ million books by title, author or ISBN-10/ISBN-13. Covers, publisher, year, page count and subjects from the live Open Library catalog.
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 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 Email Signature Generator - Outlook Gmail HTML
Free email signature generator. 10 table-based templates, MSO compatible, base64 photo embedding, click-to-call phones, social icons. 100% private.
PopularFree 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. No signup, 100% private.
PopularFree 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.
PopularFree 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 Mind Map Maker - Brainstorm Ideas
Free online mind map maker. Brainstorm and organize ideas with radial, tree and free layouts. Export PNG, SVG, Markdown, OPML. No signup, 100% private.
Free Name Generator - Fantasy, Baby, Business, Username
Free name generator with 7 sub-generators: fantasy, baby, business, brand, username, character, fake. Deterministic algorithm, 1000+ word lists, no signup.
Free OG Image Generator - Social Card Creator 1200x630
Free OG image generator. 1200x630 Open Graph cards with multi-platform preview for Twitter, Facebook, LinkedIn and Slack. 6 templates. Download PNG.
PopularFree Old Photo Restoration - Repair & Restore
Free old photo restoration. Repair scratches, dust, faded colors, low contrast and grain. 4 modes (auto, scratch, sharpen, color). 100% browser, no signup.
PopularFree Online Calculator - Scientific, Percent, BMI & Loan
More than a phone keypad: scientific functions, percent, loan payments and BMI in metric and imperial units. Free to use, no signup.
PopularFree 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 Video in Browser
Free online video editor. Trim, crop, rotate, flip, add speed, filters and text to video in your browser. 100% private, no upload, export MP4.
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 Paycheck Calculator - Take-Home Pay After Taxes 2026
Free paycheck calculator for 2026. Calculate take-home pay from hourly wage or salary. Federal + state + FICA + Medicare + 401k deductions. All 50 states.
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
Free 60-question personality test. Discover your 16 personalities MBTI type with detailed strengths, careers, and relationships. No signup, 100% private.
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.
PopularFree 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.
PopularFree 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.
Frequently Asked Questions
Are all 373 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 373 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.