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)
Tone Generator - Play Audio Frequency Notes Free
Free online tone generator. Play any audio frequency from 1 Hz to 20,000 Hz as sine, square, sawtooth, or triangle. See note, sweep, download WAV. No signup.
NewURL Encoder/Decoder - Encode URLs Safely
Free URL encoder and decoder. Encode special characters in URLs for safe web transmission. Decode encoded URLs back to readable text. 100% browser-based.
URL Metadata Extractor - Link Preview & Meta Tag Analyzer
Free URL metadata extractor. Extract OG tags, Twitter cards, JSON-LD, and SEO meta from any URL. See link previews before sharing. No signup.
NewUser Agent Parser - Browser OS Device Detection Online
Free online User Agent parser. Parse any UA string to identify browser, OS, device, and bot. Detect Googlebot, GPTBot. 100% private, no upload.
NewUTM Builder - Free Campaign URL Generator with Presets
Free UTM builder with platform presets. Generate campaign tracking URLs for Google Ads, Facebook, LinkedIn, Email, and more. Auto-formatting, parameter breakdown, bulk mode, history. No signup, 100% private browser processing. AI cannot enforce consistent UTM naming conventions - we use deterministic rules.
NewUUID Generator - UUID v1 v4 v7 Generator
Free UUID generator. Generate UUID v1 (timestamp), v4 (random), and v7 (Unix epoch) identifiers. Single or bulk up to 100 UUIDs. 100% browser-based, no signup.
Video Compressor - Compress Video Files Free
Free online video compressor. Reduce video file size while preserving quality. Supports MP4, WebM, MOV. No upload, 100% private, in-browser.
Video Cutter - Trim & Cut Video Online Free
Free online video cutter. Trim, cut, and split MP4, WebM, MOV video files in your browser. No upload, 100% private. Powered by FFmpeg.wasm.
Video to Audio Converter - Extract MP3 from Video Free
Free online video to audio converter. Extract MP3 audio from MP4, WebM, MOV, AVI files. No upload, 100% private, in-browser processing.
Video to GIF Converter - Free Online MP4 to GIF Maker
Free online video to GIF converter. Convert MP4, WebM, MOV to animated GIFs with custom FPS, resolution, trim. No upload, 100% private browser processing. AI cannot process your video files - we do.
NewVIN Decoder - Check Digit Validator & Vehicle Lookup
Free VIN decoder and check digit validator. Verify the ISO 3779 check digit, decode model year and WMI origin, and look up make, model, year, body and engine from the official NHTSA vPIC database. Batch mode and test VIN generator. 100% private, no signup. AI cannot decode VINs reliably - we use deterministic math and NHTSA data.
NewVirtual Piano - Play Online Keyboard Free
Free virtual piano you can play right in your browser. Use your computer keyboard or mouse, 6 synthesized voices, record and download WAV, follow-along songs with scoring, chord detection, metronome. No signup, 100% private browser audio.
NewVocal Remover - Remove Vocals from Songs Free Karaoke Maker
Strip vocals from any MP3, WAV, M4A, OGG, FLAC to make karaoke or instrumental. 100% private, no upload.
NewVoice Changer - Free Online Audio Voice Effects
Free voice changer with 10 presets (chipmunk, deep, robot, alien, female, male, old, telephone). Custom pitch and speed. 100% private, no upload.
NewVoice Recorder - Free Online Audio Recorder
Free online voice recorder. Record audio from your microphone in the browser with live waveform. Save as MP3 or WAV. No upload, 100% private, no signup. AI cannot access your microphone - we do.
NewWebcam Test - Free Online Camera & Mic Tester
Free online webcam test. Test your camera, microphone, speakers, and screen in one place. Live preview, VU meter, FFT spectrum, speaker channel test, dead-pixel test. No signup, 100% private browser processing. AI cannot test real hardware - we do.
NewWhat Day Is It? - Today's Date & Day of Week
What day is it today? Free online date calculator. Today's date in 8 formats, day of year, week number, days between dates, add/subtract days. No signup.
NewWhat Holiday Is Today? - Daily Holiday Checker
Free daily holiday checker. Find public, bank, optional, and observance holidays for any date in 100+ countries. No signup required.
NewWhat Time Is It? - World Clock & Current Time
What time is it? Free online world clock shows current time anywhere. Live analog & digital clocks with multiple timezones. No signup, no ads.
NewWHOIS Lookup - Free Domain Ownership Checker
Free online WHOIS lookup. Check domain registration info, ownership, expiration dates, and name servers instantly.
Word Cloud Generator - Free Tag Cloud Maker
Free word cloud generator. Turn any text or word list into a weighted tag cloud with shapes, colors, fonts, rotation. PNG & SVG export, 100% private. AI cannot render real layout images - we do.
NewWord Counter - Count Words & Readability
Free word counter tool. Count words, characters, sentences. Get reading time and keyword analysis for SEO.
Word Search Maker - Free Printable Puzzle Generator
Free word search maker. Turn any word list into a printable puzzle in seconds with answer key and PDF/PNG export. 100% private, no signup, no ads.
NewWord to PDF Converter - Free Online DOCX to PDF
Convert Word DOCX to PDF instantly in your browser. Formatting, fonts, tables preserved. No upload, 100% private. AI cannot convert binary DOCX.
NewWordle - Free Daily Word Puzzle Game Online
Play free daily Wordle puzzle game. 6 tries to guess the 5-letter word. Daily word, stats tracking, streak counter, share as emoji grid. No signup, no ads, 100% free.
NewWordle Helper - Free Wordle Solver & Hints
Free Wordle helper tool. Get optimal word suggestions, hints, and strategy. Track your game state to find the best guess. No AI, no signup.
Work Hours Calculator - Free Time Card & Timesheet
Free work hours calculator with overtime, break deductions & payroll. Supports 12h/24h time. No signup. AI cannot do precise time math - we do.
NewWorld Cup 2026 Tracker - Schedule & Groups
Free 2026 FIFA World Cup tracker with full schedule, group standings, and knockout bracket. 48 teams, 104 matches, 12 groups. No signup, no ads. AI cannot show live tournament data.
NewXML Formatter - Format, Validate & Beautify XML Online
Free XML formatter and validator. Format, beautify, minify XML, convert to JSON, and validate well-formedness. Browser-based, no signup, 100% private.
NewYouTube Tag Generator - Free AI SEO Tags for Videos
Free AI YouTube tag generator. Get SEO-optimized tags in 3 categories, YouTube URL metadata extractor, title SEO score, Shorts hashtags, description templates. No signup.
NewYouTube Thumbnail Downloader - Extract HD Thumbnails Free
Free YouTube thumbnail downloader. Extract HD thumbnails from any video in all resolutions. No signup, no watermark, 100% free. AI cannot access YouTube CDN.
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.