Developer tools that work.
245 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 245 tools (alphabetical)
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 & 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.
NewGIF 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.
NewGold 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.
NewHash 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.
NewHTML 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.
NewHTML 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.
NewHTML 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.
NewHTML 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.
NewHTML 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.
NewHTTP 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.
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.
NewImage 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.
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.
PopularImage 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.
NewImage 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.
NewImage 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.
NewImage 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.
NewImage 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.
NewImage 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.
NewImage 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.
NewInflation 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.
NewIP 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.
NewJavaScript 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.
NewJS 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.
NewJSON Formatter - Format & Validate JSON
Free JSON formatter. Format, minify, beautify JSON and convert to YAML with syntax error detection.
PopularJSON 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.
NewJSON 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.
NewJSON 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.
NewJSON 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.
NewJSON 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.
NewJWT 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.
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.
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.
NewLoan 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.
NewMermaid 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.
NewMeta 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.
NewFrequently Asked Questions
Are all 245 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?
No. 245 out of 245 tools process everything in your browser. Only 3 tools (AI Chat, AI Detector, Image Generator, Story Animator) call a server API because the underlying model requires GPU compute — and those calls send no logs.
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 245 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.