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.
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11 categoriesView all 281 tools (alphabetical)
DNS & WHOIS Lookup - Check Domain Records
Free DNS lookup and WHOIS checker. Query DNS records (A, AAAA, MX, NS, SOA, TXT) and domain registration info instantly. No signup required.
Dog Age Calculator - Dog Years to Human Years
Free dog age calculator. Convert dog years to human years with size-adjusted AVMA formulas and the UCSD epigenetic clock. Breed presets, life stages, chart. No signup, 100% private.
NewDomain Age Checker - Free WHOIS Domain Age Lookup
Free domain age checker. Check how old any domain is with instant WHOIS lookup. See creation date, age in years/months/days, expiry date, registrar, and nameservers. No signup. AI cannot check real WHOIS records - we do.
NewDrawing Board - Free Online Whiteboard & Sketch Pad
Free online drawing board. Sketch, draw shapes, add text, save as PNG. No signup, no upload, 100% private browser canvas tool. AI cannot draw - you do it yourself.
NewDue Date Calculator - Pregnancy & Ovulation Calendar
Free due date calculator using LMP, conception, and IVF methods. Includes ovulation calculator and period predictor. 100% private, no signup, no tracking. AI cannot compute personalized due dates - we use deterministic formulas.
NewEmail Authentication Checker - SPF DKIM DMARC Check
Free email authentication checker. Check SPF, DKIM, and DMARC records for any domain. Fix email deliverability. AI cannot check real DNS records - we do.
NewEmail Verifier - Verify Email Addresses Instantly
Free email verifier. Check if email addresses are valid and can receive messages. Detect disposable emails and SMTP issues. No signup required.
Excel to PDF Converter - Free Online XLSX to PDF
Free online Excel to PDF converter. Convert XLSX and XLS to PDF in your browser. Multi-sheet support. 100% private, no upload, no signup, unlimited conversions. AI cannot convert binary Excel files - we do.
NewExcel Viewer & Converter - Free Online XLSX Viewer
Free online Excel viewer and converter. View XLSX, XLS, CSV files without Excel. Convert to JSON or CSV. 100% private, no upload, no signup.
NewEXIF Viewer - Read Photo Metadata & Remove GPS Location Free
Free online EXIF viewer. Read hidden photo metadata - GPS location, camera settings, date taken. Remove EXIF/GPS before sharing. 100% private, no upload, no signup. AI cannot read binary EXIF data - we do.
NewFace Age Estimator - How Old Do I Look? Free AI Age Detector
Free AI face age estimator. Detect how old you look in any photo or via live camera. 100% private browser processing, no upload, no signup. Multi-face, expressions & gender. AI cannot analyze real faces - we do.
NewFancy Text Generator - Cool Unicode Fonts and Stylish Text
Free fancy text generator. Convert plain text into 30+ cool Unicode font styles. Bold, italic, script, gothic, circled. No signup, 100% private.
NewFavicon Generator - Free ICO, PNG Favicon Creator Online
Free favicon generator. Create favicons from text, emoji, image upload, or solid color. Export ICO + all PNG sizes in one ZIP. Live preview, 100% browser-based. AI cannot generate .ico binary files - we do.
NewFile Checksum Verifier - Verify MD5 SHA-1 SHA-256 SHA-512
Verify file checksums after downloading. Compute MD5, SHA-1, SHA-256, SHA-512 hashes from any file. 100% private, no upload, no signup.
NewFile Opener - Open APK, RAR, DLL, DAT, BIN Online
Free online file opener. Detect, view, and extract 50+ file types (APK, RAR, ZIP, DLL, DAT, BIN, DOCX) using magic numbers. Browser-only, no upload, 100% private. AI cannot parse real binary files - we do.
NewFraction Calculator - Add Subtract Multiply Divide Fractions
Free fraction calculator. Add, subtract, multiply, divide fractions. Simplify, convert mixed/improper, compare. Step-by-step, 100% private browser. AI cannot do fraction math - we do.
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 AI Detector - Check If Text Is AI Generated
Free AI content detector using multi-model voting (Groq, Gemini, NVIDIA). Detect ChatGPT, Claude, Gemini text with sentence highlighting. No signup.
NewFree AI Humanizer - Make AI Text Undetectable
Free AI humanizer with 5-stage DeAI pipeline. Bypass GPTZero, Turnitin, Copyleaks. No signup, no word limit, no paywall. Real MAGE, Burstiness, and brandonwise detector scores shown. Self-hosted.
NewFree AI Paraphrasing Tool - Rewrite Text Online
Free AI paraphrasing tool that rewrites text while preserving meaning. 8 modes including humanizer makes AI text sound natural. No signup, no limits.
Free AI Plagiarism Checker - AI-Powered Content Originality Test
Free AI plagiarism checker that searches the web for duplicate content. Get similarity percentage, source URLs, and suggestions. No signup required.
Free AI PPT Maker - Generate Editable PowerPoint Slides
Free AI PPT maker with 4 professional styles. Generates real editable .pptx files in 10 seconds. No signup, no watermark, no daily limit. Uses Groq Llama 3.3 70B + PptxGenJS. 10 languages. AI cannot generate valid .pptx binary.
NewFree AI Resume Builder - Professional Resume Generator
Free AI-powered resume builder. Enter your details and get a professionally formatted resume instantly. No signup required.
Free AI Translator - AI Multi-Language Translation
Free AI translator supporting 50+ languages. Translate text instantly with context-aware translations. No signup required.
Free ATS Resume Checker - Score & Scan Your Resume
Free AI-powered ATS resume checker. Score your resume 0-100 against any job description. Detects missing hard skills, soft skills, keywords, and ATS format issues. 5-priority Jobscan-style scoring, AI suggestions, 100% private. No signup, unlimited scans. 99% of Fortune 500 use ATS - this tool beats them.
NewFree Audio Converter - Convert MP3, WAV, FLAC, OGG, AAC
Free online audio converter. Convert between MP3, WAV, FLAC, OGG, M4A, AAC, OPUS, AIFF. Adjust bitrate, sample rate, channels. No upload, 100% private, in-browser FFmpeg.wasm.
NewFree Binary Hex Converter - Convert Binary to Decimal, HEX, ASCII
Free online binary hex converter. Convert between binary, decimal, hex, and ASCII text. Instant conversion, no upload needed. Developer tool for encoding.
Free BMI Calculator - Body Mass Index Checker
Free BMI calculator to check your body mass index. Supports metric and imperial units. Instant results with health category classification. No signup required.
Free Book Search & ISBN Lookup - 30M+ Open Library
Search 30+ million books by title, author, or ISBN-10/ISBN-13. Get covers, publisher, year, page count, subjects, and links to Open Library, Google Books, WorldCat, Amazon. AI cannot accurately recall book metadata - we use the live Open Library catalog. No signup, 100% private.
NewFree Business Card Maker - Printable Card Designer
Free business card maker. Design cards with 5 templates, custom fonts, PNG/PDF/vCard export. No signup, 100% private. AI cannot make 300 DPI print files.
NewFree Case Converter - Convert Text Case Online
Free online case converter. Convert text to uppercase, lowercase, title case, sentence case, camelCase, snake_case, kebab-case, and more. Instant results.
Free Citation Generator - APA, MLA, Chicago
Free AI citation generator. Generate citations in APA, MLA, Chicago, Harvard, and IEEE formats. Just describe your source and get a formatted citation.
Free Click Speed Test - CPS & Reaction Time
Free online click speed test (CPS) and reaction time tester. Measure clicks per second over 1, 5, 10, 30, 60 or 100 seconds with left click, right click, spacebar or touch. Kohi mode, best 1s burst, personal bests. No signup.
NewFree Color Palette Extractor - Extract Colors from Image
Free online color palette extractor. Extract dominant colors from any image as HEX, RGB, HSL values. Download CSS variables or JSON. No signup required.
Free Currency Converter - 166+ Currencies Exchange Rates
Free currency converter. Convert between 166+ world currencies instantly. Live exchange rates, swap currencies, search by country or currency code.
Free Daily Horoscope - Personalized Astrology & Birth Chart
Free personalized daily horoscope. AI cannot compute real planetary transits or natal charts - we use astronomy-engine for accurate sun sign, moon sign, 2026 forecasts. 6 languages, 100% private.
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.
NewFree English Dictionary - Definition, Pronunciation, Synonyms
Free English dictionary with real-time definitions, audio pronunciation (US & UK), phonetic transcription, synonyms, antonyms, and examples. No signup, no tracking, 100% private.
NewFree Grammar Checker - AI Error Explanation
Free AI grammar checker that not only corrects your English but explains why it's wrong. Perfect for learning proper grammar rules.
Free Image Resizer - Resize Images Online Free
Free online image resizer. Resize images to exact dimensions for social media, web, email. No upload - privacy-first client-side processing. Support JPG.
Free Image to Text (OCR) - Extract Text from Images Online
Free online OCR tool to extract text from images. Supports English, Chinese, Japanese, Korean and 10+ languages. 100% private, in-browser processing.
Free Invoice Generator - PDF Invoice Maker Online
Free online invoice generator. Create professional invoices with tax, discount, 30+ currencies, and PDF download. 3 templates (Freelancer, Consulting, Service). No signup, no watermark, 100% private browser processing. AI cannot do fixed-precision tax math reliably - we do.
NewFree Logo Maker - Design Custom Logos Online
Create a professional logo with 60+ icons, custom fonts, and colors. Download PNG and SVG. No signup, no watermark, 100% free.
NewFree Lottery Number Generator - Random Pick 3/4/5/6
Free lottery number generator. Pick 3, Pick 4, Pick 5, and Pick 6 games. Generate random winning numbers for Powerball, Mega Millions, and more. No signup.
Free Markdown Editor & Preview - Live MD to HTML Converter
Free online markdown editor with live HTML preview. Write markdown, see rendered output instantly. GitHub Flavored Markdown, syntax highlighting, copy HTML. No signup, 100% private browser processing. AI cannot render live markdown previews - we do.
NewFree Mind Map Maker - Brainstorm Ideas
Free mind map maker. Brainstorm and organize ideas with radial and free layouts. Keyboard shortcuts, PNG/SVG/Markdown/OPML export. No signup, 100% private.
NewFree Old Photo Restoration - Repair & Restore
Free old photo restoration. Repair scratches, dust, faded colors, low contrast, grain. 4 specialized modes (auto, scratch, sharpen, color). 100% browser, no upload, no signup. AI cannot access your private photos - we can.
NewFree Online Barcode Generator - Create QR Code, UPC, EAN, Code 128
Free online barcode generator. Create QR codes, UPC, EAN, Code 128, Code 39 and more. Download as PNG/SVG. No signup required, 100% free.
Free 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.
PopularFree Online Math Solver - Step-by-Step Solutions
Free online math solver with step-by-step solutions. Solve algebra, equations, fractions, and more. No signup required, instant results.
Frequently 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.