Developer tools that work.
323 free utilities for code formatting, file conversion, calculations, 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 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.
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.
NewImage 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 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.
NewJSON Formatter - Format & Validate JSON
Free JSON formatter. Format, minify, beautify JSON and convert to YAML with syntax error detection.
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.
NewLive 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.
NewRecently Updated
6 toolsAPCA Contrast Checker - WCAG 3 Lc Calculator
Free APCA contrast checker for WCAG 3. Get the Lc value, the minimum Lc your font size and weight need, the WCAG 2.1 ratio, and a passing color fix.
NewPDF Compare - Free Online PDF Diff & Side-by-Side
Free PDF compare tool. Side-by-side visual diff with scroll sync, text-based diff with green/red highlights, page-by-page navigation, export PDF report. 100% private browser processing, no upload, no signup.
NewMath Calculator - Polynomial, Matrix, Prime Factor & More
Free math calculator. 6 modes: polynomial factoring, prime factorization, GCF/LCM, matrix (det/inv), quadratic formula, sequence. Step-by-step. No signup.
NewFree OG Image Generator - Social Card Creator 1200x630
Free OG image generator. 1200x630 Open Graph cards with multi-platform preview (Twitter, Facebook, LinkedIn, Slack). 6 templates, custom colors, fonts, logo upload. Download PNG and copy meta tags. No signup, 100% browser. AI cannot output exact OG dimensions + multi-platform safe area validation.
NewTDEE Calculator - BMR, Macro, Protein, Water, 1RM
Free TDEE calculator. 6 modes in one: BMR (3 formulas), macro split (5 diets), protein target, water intake, and 1 rep max. kg/lb toggle. No signup.
NewAI Essay Writer - Free Academic Essay Generator
Free AI essay writer for 9 types, 4 levels, 5 citation styles. Outline + thesis + draft modes, editable, downloadable. No signup, no word limit.
NewBrowse by Category
11 categoriesView all 323 tools (alphabetical)
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.
NewFree 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.
NewFree 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.
NewFree 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.
NewFree 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 (Twitter, Facebook, LinkedIn, Slack). 6 templates, custom colors, fonts, logo upload. Download PNG and copy meta tags. No signup, 100% browser. AI cannot output exact OG dimensions + multi-platform safe area validation.
NewFree 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.
NewFree 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.
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…
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.
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.
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.
NewFree Tarot Card Reading Online - Celtic Cross, Yes/No, Daily
Free tarot card reading online. 78 authentic Rider-Waite cards, 7 spreads (Daily, Yes/No, Past-Present-Future, Celtic Cross, Birth Card, Love, Career). No…
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 Tile Calculator - Floor, Wall & Pattern Estimator
Free tile calculator with multi-room aggregation, 5 patterns, box optimization, grout and thinset estimator, waste factor. 100% private.
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.
NewFree 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.
NewFree 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 and Stick Drift
Free online gamepad tester. Test every button, trigger and analog stick. Measure stick drift and deadzone. Export a diagnostic report. 100% private.
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.
GIF to MP4 Converter - Free Online GIF to Video
Free GIF to MP4 converter. Convert animated GIFs to MP4 video files online. Reduce GIF file size by 90% with H.264 compression. 100% private, no upload,…
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.
GPA Calculator - 4 Scales, Semester & Cumulative
Free GPA calculator with 4 scales (US 4.0/4.3, Indian 10.0, percentage), unlimited semesters, prior GPA integration, target GPA planner, and Honors/AP/IB…
Grade Calculator - Weighted Average & Final Exam
Free grade calculator. Calculate weighted average grade, what you need on the final exam, and GPA. No signup, 100% private browser tool. AI cannot…
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.
Hash Generator - MD5 SHA-1 SHA-256 SHA-512
Generate cryptographic hashes: MD5, SHA-1, SHA-256, SHA-512. Compute checksums instantly in your browser.
Hashtag Generator - Instagram, TikTok, YouTube, Twitter,…
Free hashtag generator for Instagram, TikTok, YouTube, Twitter, LinkedIn and Facebook. Platform-aware rules, 6 categories, copy-all, live character count.…
HEIC to JPG Converter - Free iPhone Photo Converter
Free online HEIC to JPG converter. Convert iPhone HEIC photos to JPEG instantly in your browser. Batch convert unlimited photos. No upload, 100% private.
Frequently Asked Questions
Are all 323 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 323 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.