Developer tools that work.
194 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.
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.
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.
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.
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.
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11 categoriesView all 194 tools (alphabetical)
Readability Score Calculator Online
Free readability calculator. 6 formulas: Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI. Grade level + sentence highlighting.
NewRegex 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
Free feedback form for DevTools Hub. Suggest new tools, report bugs, request features. Admin replies via KV storage. No signup.
NewRoman Numeral Converter - Free Online Number Tool
Free Roman numeral converter. Convert numbers to Roman numerals and back, including dates. Supports 1-3,999,999 with overline notation. 100% accurate, no signup.
NewSchema Markup Generator - Free JSON-LD Structured Data Tool
Free Schema Markup Generator. Create valid JSON-LD structured data for Article, Product, FAQ, LocalBusiness, Organization, HowTo, Event, Person, BreadcrumbList, and WebSite. Built-in validation, live preview, @graph mode. No signup, 100% private browser processing. AI cannot generate valid schema markup - we do.
NewSnake Game - Classic Snake Online Free
Play the classic Snake game online free. Control your snake, eat food, grow longer. Multiple speeds, grid sizes, wall wrap mode. No ads, no signup.
Solitaire - Free Classic Klondike Card Game Online
Play free Klondike Solitaire online. Classic card game with undo, hint, draw 1 or 3. No signup, no ads, 100% free in your browser.
Song Lyrics Finder - Free Lyrics Search No Signup
Free online song lyrics finder. Search by artist and title. No signup, no ads, no tracking. 100% private. AI cannot retrieve copyrighted lyrics - we do.
NewSpace Keeper - Keep HuggingFace Spaces Awake
Free tool to keep your HuggingFace Spaces awake and prevent idle timeout. Supports multiple access methods, uptime monitor, custom intervals (1-48 hours).
Speech Time Calculator - Words to Minutes & Speaking Time
Free speech time calculator. Convert words to minutes and seconds at standard speaking rates (100-238 wpm). Paste text, set WPM, add pause buffer. No signup. AI hallucinates speech times.
NewSQL Formatter - Format & Beautify SQL
Free SQL formatter. Format and beautify SQL queries with proper indentation. Supports MySQL, PostgreSQL, SQLite.
SSL Certificate Checker - Test Website Security
Free SSL checker. Scan any website for TLS security and certificate validity. Get grade A+ to F. No signup. AI cannot test real SSL certificates.
Stopwatch - Free Online Stopwatch with Lap Times
Free online stopwatch with millisecond precision, lap/split timing, lap statistics, CSV export, and fullscreen mode. No signup, no ads. Works offline.
NewSubnet Calculator - IPv4 IPv6 CIDR VLSM Supernetting
Free subnet calculator for IPv4 and IPv6. Bit-exact CIDR, VLSM, supernetting, overlap detection. No signup. AI cannot reliably compute subnets - we do.
NewSubtitle Editor - Free Online SRT & VTT Editor
Free online subtitle editor. Edit, fix, and convert SRT and VTT subtitle files in your browser. Batch shift timing, validate overlaps, split long cues, merge adjacent. No upload, no signup, 100% private. AI cannot handle millisecond-precise timestamp math - we do.
NewSunrise Sunset Calculator - Find Sunrise & Sunset Times
Free online sunrise and sunset calculator. Enter any city to get today's sunrise and sunset times. No signup required.
SVG to PNG Converter - Free Online SVG Rasterizer
Free SVG to PNG converter. Rasterize SVG vectors to PNG, JPG, WebP with scale control, custom dimensions, background color. Paste SVG code or upload files. 100% browser-based, no upload, no signup. AI cannot rasterize SVG — we do.
NewText Cleaner - Remove Line Breaks, Spaces & HTML Tags
Free online text cleaner. Remove line breaks, extra spaces, HTML tags, duplicate lines, and clean messy text with 20+ deterministic options. No signup, 100% private browser processing. AI cannot clean text deterministically - we do.
NewText Summarizer - Condense Articles & Papers
Free online text summarizer. Condense articles, papers, and text into key points. Extractive mode (100% private) or AI abstractive via Llama 3.3. No signup, no limits, no paywall.
NewText to Handwriting - Free Online Handwritten Text Generator
Free text to handwriting converter. Turn typed text into realistic handwritten notes on lined, grid, or plain paper. 18 fonts, 7 ink colors, PNG/JPG/PDF export. No signup, no watermark.
NewText to Speech - Free Online Voice Generator
Free online text to speech with 8 AI voices. Convert text to natural-sounding audio in English and Chinese. No signup required. Browser TTS and AI-powered.
Timestamp Converter - Unix Time Conversion
Convert Unix timestamps to dates and dates to timestamps. Shows current timestamp updating in real-time.
URL Encoder/Decoder - Encode URLs Safely
Free URL encoder. Encode special characters in URLs for safe transmission.
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.
NewUUID Generator - UUID v1 v4 v7 Generator
Generate UUID v1, v4, and v7 identifiers. Single or bulk generation up to 100 UUIDs at once.
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.
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 Counter - Count Words & Readability
Free word counter tool. Count words, characters, sentences. Get reading time and keyword analysis for SEO.
Word 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 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.
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