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.
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11 categoriesView all 323 tools (alphabetical)
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.
NewMouse 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.
Number to Words Converter - Free Online Tool
Free number to words converter. Convert any number to English words instantly. Spell out numbers for checks, invoices, legal documents. Supports decimals,…
Object Remover - AI Magic Eraser for Photos
Free AI object remover. Brush over unwanted people, text, watermarks, signs, blemishes and let AI fill the background. No signup, no watermark, HD output.…
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.
NewOnline Chart Maker - Bar, Line, Pie & Radar
Free online chart maker. Create bar, line, pie, doughnut, radar charts with custom colors, labels, data. Export PNG. No signup, private.
Online Code Runner - Python, JavaScript & HTML Live Compiler
Free online code runner. Run Python, JavaScript, and HTML/CSS in your browser. Real Pyodide WASM Python, sandboxed JS Web Worker, live HTML preview. No…
Online Guitar Tuner - Free Mic Guitar Tuner
Free online guitar tuner. Tune by microphone with real-time pitch detection, cent-precision needle, 8 tunings plus Bass, Ukulele, Violin. 100% private.
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.
P-Value Calculator - Hypothesis Test & Z, T, Chi-Square
Free p-value calculator. Run z-test, t-test, chi-square, regression and confidence intervals. Exact p-values, step-by-step. No signup, 100% private.
Paint Calculator - Free Wall, Room & Trim Estimator
Free paint calculator. Multi-room wall area, doors and windows subtraction, 6 paint types, 5 surface textures, multi-coat, primer, ceiling, trim, waste…
Passport Photo Maker - Free Online 2x2, 35x45mm
Free passport photo maker. US 2x2, Schengen 35x45mm, India 35x35mm, China 33x48mm. Auto white background, print sheet, 100% private browser tool.
Password Generator - Create Strong Passwords
Generate strong, secure passwords with real-time strength analysis. Learn what makes a password secure.
PopularPassword Strength Checker - Test & Analyze Password Security
Free online password strength checker. Test password security with entropy calculation, crack time estimation, breach check via HIBP. No signup, 100%…
PDF Aloud Reader - Read PDF Aloud Free
Free PDF aloud reader. Listen to any PDF read aloud with natural browser voices. Speed, pitch, page nav, bookmark. 100% private, no upload.
PDF 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.
NewPDF 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.
NewPDF 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 Form Filler - Fill Out PDF Forms Online Free
Free PDF form filler. Fill out any PDF form online. Text fields, checkboxes, radio buttons, dropdowns. 100% private browser processing, no upload, no…
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 OCR - Free Online Scanned PDF to Searchable PDF
Free PDF OCR. Convert scanned PDFs to searchable PDFs in your browser. Tesseract.js + pdf-lib. 13 languages, 150-300 DPI. No upload, 100% private.
NewPDF 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.
PDF Redactor - Permanently Redact PDF Online Free
Free PDF redactor. Permanently redact text from PDFs - search words, draw boxes, auto-detect emails, phones, credit cards. 100% private, no upload.
PDF Signer - Sign PDF Online Free Electronic Signature
Free online PDF signer. Draw your electronic signature on any PDF — contracts, agreements, NDAs. 100% private browser processing, no upload, no signup, no…
PDF to Excel Converter - Free Online PDF to XLSX
Free online PDF to Excel converter. Extract tables and data from PDF to XLSX. 100% private, no upload, no signup, unlimited conversions.
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.
NewPDF 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.
NewPDF Unlocker - Remove Password Protection Free Online
Free online PDF unlocker. Remove password protection from PDF files in your browser. No upload, no signup, no daily limits. 100% private, AES-256…
PDF Watermark - Add Text Watermark to PDF Free Online
Free online PDF watermark tool. Add CONFIDENTIAL, DRAFT, or custom text watermarks to any PDF. 100% private browser processing, no upload, no signup, no…
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 Image Combiner
Free photo collage maker. Combine multiple images into collages with 8 layout templates, custom spacing, background, border radius.
Photo Editor - Free Online Image Editor No Signup
Free online photo editor. Crop, rotate, adjust brightness, contrast, saturation. Apply filters, add text, draw, resize. No signup, no upload, 100% private…
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. 100% private browser, no…
Photo to Pencil Sketch Converter - Free Online Sketch Effect
Free photo to pencil sketch converter. Turn any photo into a realistic pencil sketch, charcoal, ink or line art with 5 art styles and live controls. 100%…
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.
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.
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.
Printer Test Page - Print Quality Diagnostic
Free printer test page. Print color, CMYK, nozzle, banding, alignment and text sharpness test sheets to diagnose HP, Epson, Canon & Brother printers.…
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, JSON-LD…
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.
PopularQR 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.
NewRandom 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.
Receipt Generator - Free Online Receipt Maker
Free online receipt generator. Create professional receipts with auto-calculated tax, discount, multi-currency, line items, and PDF download. 100%…
Recipe Converter - Free Scale & Convert Recipes Online
Free recipe converter. Scale any recipe up or down, convert metric to US cups, convert cups to grams with real ingredient densities. 80+ ingredients,…
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 - Feedback
Report problems or bugs you find on DevTools Hub. Help us improve by sharing issues with our free developer tools.
REST API Tester - Free Online HTTP Client
Free online REST API tester and HTTP client. Send GET, POST, PUT, PATCH, DELETE requests with custom headers and body. View response status, headers,…
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.