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)
Virtual Piano - Play Online Keyboard Free
Free virtual piano you can play right in your browser. Use your computer keyboard or mouse, record and download WAV, follow along with 6 songs, chord…
Vocal Remover - Remove Vocals from Songs Free
Free online vocal remover. Strip vocals from any song to make karaoke or instrumental versions. MP3, WAV, M4A, OGG, FLAC. 100% private, no upload.
Voice 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.
Voice Recorder - Free Online Audio Recorder
Free online voice recorder. Record audio from your microphone in the browser. Live waveform, pause/resume, save as MP3 or WAV. No upload, 100% private, no…
Webcam 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 Should I Watch Tonight? - Free Movie Night Picker
Free movie night picker with curated database of popular movies. Filter by genre, year, runtime, mood, streaming. Stop scrolling, start watching. No…
What 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 into a weighted tag cloud with shapes, colors and fonts. PNG & SVG export. 100% private, no signup.
Word 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 PNG/PDF export. 100% private, no signup, no ads.
Word to PDF Converter - Free Online DOCX to PDF
Free online Word to PDF converter. Convert DOCX files to PDF directly in your browser. Preserves formatting, fonts, tables, and images. No upload, 100%…
Wordle - 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. Calculate weekly time card hours, overtime, break deductions, and pay. Supports 12h/24h format. No signup, 100% private…
Workout Planner - Free Personalized Training Plan & Tracker
Free workout planner with personalized training plan generator, session tracker, and progress charts. 100+ exercises, progressive overload, PDF export. No…
World 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-powered YouTube tag generator. Generate SEO-optimized tags, score your title, extract video metadata, get YouTube Shorts hashtags. No signup, no…
YouTube 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.
NewYouTube Transcript Extractor - Free Video to Text & SRT/VTT
Free YouTube transcript extractor. Pull captions from any YouTube URL as plain text, timestamped text, SRT, or VTT. Multi-language, bulk mode, 100% free,…
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.