Developer tools that work.
373 free utilities for code formatting, file conversion, online calculators, 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 Groq and NVIDIA models. No login, no signup, no tracking. Coding, writing, math, brainstorming. Conversations stay in your browser.
Audio to Text Converter - Free Online Speech to Text
Free online audio to text converter. Convert speech to text in real-time with browser-based voice recognition. No uploads, no sign-up, 100% private.
Condom Size Calculator - Find Your Exact Fit
Free condom size calculator. Enter girth and length in mm, cm or inches to get your nominal width range and a fit verdict for any condom. 100% private.
Free Online Calculator - Scientific, Percent, BMI & Loan
More than a phone keypad: scientific functions, percent, loan payments and BMI in metric and imperial units. Free to use, no signup.
Free Email Signature Generator - Outlook Gmail HTML
Free email signature generator. 10 table-based templates, MSO compatible, base64 photo embedding, click-to-call phones, social icons. 100% private.
Image 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 with Aspect Ratio
Free online image cropper. Crop with aspect ratio presets, rotate, flip and zoom. Social media sizes for Instagram, Facebook and Twitter. No upload.
JSON Formatter - Format & Validate JSON
Free JSON formatter. Format, minify and beautify JSON, convert to and from YAML, and get the exact line of any syntax error. 100% browser, no upload.
Recently Updated
6 toolsCSS Specificity Calculator - Compute Selector Weight
Free CSS specificity calculator. Compute a,b,c values for any selector instantly. Understand selector weight and cascade priority. No signup.
NewHeart Rate Zone Calculator - 5 Zones by Age
Free heart rate zone calculator. Enter your age to get all five training zones in bpm, compare four max HR formulas, and find your personal Zone 2 range.
AI Code Reviewer - Free Online Code Review
Free AI code reviewer. Paste code, get instant review for bugs, performance, security, and best practices. No login, private.
NewPDF to Text Extractor - Free Online PDF Text Reader
Free PDF to text extractor. Extract plain text from any PDF in your browser. No upload, no signup, 100% private. Copy or download results.
NewMarkdown to PDF Converter - Free Online MD to PDF
Free online MD to PDF converter. Convert markdown to PDF instantly in browser. Preserve formatting, headings, code blocks, tables. No signup, 100% private.
NewKeyword Suggestions Generator - Free SEO Keyword Research
Free keyword suggestions from Google and Bing autosuggest. Expand one seed into 20 live search ideas, compare both engines, and copy the list. No signup.
NewBrowse by Category
11 categoriesView all 373 tools (alphabetical)
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.
Weather Forecast - Live 7-Day Forecast and Charts
Free weather forecast tool. See current weather, 7-day forecast, hourly details. AI cannot show real-time weather with visual charts.
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 and channel tests.
PopularWhat Day Is It? - Today's Date, Week Number & Holidays
What day is it today? Today's date in 8 formats, day of year, week number, days between dates, and a month calendar. Free.
What 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.
What 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.
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.
WHOIS Lookup - Free Domain Ownership Checker
Free WHOIS lookup. Registration dates, registrar, owner, name servers and expiry for any TLD, plus live DNS records. No account, no signup.
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. Count words, characters, sentences and reading time, with keyword density and SEO readability. Private, handles large documents.
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. 6 tries to guess the 5-letter word. Daily word, stats tracking, streak counter, share as emoji grid. No signup, no ads.
PopularWordle 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 - Personalized Training Plan and Tracker
Free workout planner with personalized training plan generator, session tracker, and progress charts. 100+ exercises, progressive overload, PDF export.
World Cup 2026 Tracker - Schedule & Groups
Free 2026 FIFA World Cup tracker with the full schedule, group standings and knockout bracket. 48 teams, 104 matches, 12 groups. No signup.
PopularXML 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.
YouTube 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.
YouTube Thumbnail Downloader - Extract HD Thumbnails Free
Free YouTube thumbnail downloader. Extract HD thumbnails from any video in every resolution. No signup, no watermark, 100% free.
PopularYouTube Transcript Extractor - Video to Text and SRT
Free YouTube transcript extractor. Pull captions from any YouTube URL as plain text, timestamped text, SRT, or VTT. Multi-language, bulk mode, 100% free.
YouTube Video Summarizer - AI Video Summary Tool
Free AI YouTube video summarizer. Paste a YouTube video URL and get an AI-generated summary with key points. Private, no signup, no key.
NewZodiac Compatibility Calculator - Match Score by Birth Date
Free zodiac compatibility calculator: two birth dates give an instant sign match score with love, trust and communication breakdowns. 100% in your browser.
NewFrequently Asked Questions
Are all 373 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 373 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.