Free tools sorted by category so people understand what to use them for.

Most popular

• Website Auditor — Audit any website free: 25+ SEO, indexing, social and AI-search checks with a fix for each, plus Google PageSpeed scores and Core Web Vitals.
• QR Code Generator — Free QR codes for links, Wi-Fi, contact cards, WhatsApp, email, SMS and text, with your logo and colours. Download PNG or SVG. Codes never expire.
• OTP Code Generator — Live TOTP codes for testing 2FA, with a QR code for authenticator apps, SHA-1/256/512, and previous/next codes for clock drift.
• PX to REM Converter — Convert px to rem and back as you type, or convert a whole stylesheet at once. Works with any root font size.
• Unix Timestamp Converter — The current Unix time, live. Convert epoch seconds, milliseconds, micro- or nanoseconds to a date and back, with code for 9 languages.
• Dev Quote Checker — Check whether a website or app development quote is fair: the typical price and timeline for your scope, the contract terms that put you at risk, and what to ask before you sign.

All 64 free tools

Strategy & Growth

• Find Questions Tool — Search 1,000 ready-to-use FAQ prompts and answers across B2B industries for SEO, GEO, and service pages.
• App Idea Validator — Score an app idea across demand, delivery risk, timeline pressure, and monetization fit.
• Dev Quote Checker — Check whether a website or app development quote is fair: the typical price and timeline for your scope, the contract terms that put you at risk, and what to ask before you sign.
• MVP Cost Estimator — Estimate early-stage product cost, timeline, and scope tradeoffs before a vague quote becomes a bigger problem.
• Tech Stack Recommender — Match project constraints to frontend, backend, database, and hosting recommendations.

SEO & Web Utilities

• Website Auditor — Audit any website free: 25+ SEO, indexing, social and AI-search checks with a fix for each, plus Google PageSpeed scores and Core Web Vitals.
• URL Encoder and Decoder — Encode or decode percent-encoded URLs for links, query strings, and debugging.
• HTML Entity Encoder — Escape or unescape HTML entities safely when rendering text into markup.
• URL Parser — Break a URL into origin, protocol, host, path, query params, hashes, and credentials.
• Device Information — Check screen size, pixel ratio, user agent, and browser-level device diagnostics.
• Basic Auth Generator — Build a Base64 basic-auth header from a username and password pair.
• Open Graph Meta Generator — Generate Open Graph and social sharing tags for websites, landing pages, and articles.
• OTP Code Generator — Live TOTP codes for testing 2FA, with a QR code for authenticator apps, SHA-1/256/512, and previous/next codes for clock drift.
• MIME Types Converter — Look up file extensions from MIME types or move the other direction quickly.
• JWT Parser — Decode JWT header and payload content locally without sending tokens to a server.
• Keycode Info — Inspect key values, keycodes, modifiers, and keyboard events from real key presses.
• HTML WYSIWYG Editor — Compose HTML visually while seeing the generated markup update in real time.
• User-Agent Parser — Parse browser, engine, OS, device class, and CPU hints from a user-agent string.
• HTTP Status Codes — Reference common HTTP status codes, grouped meanings, and typical response behavior.
• Meta Tag Generator — Generate SEO-optimized HTML meta tags including title, description, Open Graph, and Twitter Card tags. Copy and paste into your site.
• Schema Markup Generator — Generate valid JSON-LD structured data for Organization, Local Business, Article, FAQ, and Product schema so search engines and AI assistants can parse and cite your pages.
• UTM Campaign Builder — Build trackable campaign URLs with utm_source, utm_medium, and utm_campaign tags for Google Analytics and marketing attribution.
• Robots.txt Generator — Generate a robots.txt file that controls search and AI crawlers including ChatGPT, Claude, Perplexity, and Google AI, with sitemap support.

Security & Crypto

• Token Generator — Generate random strings for API keys, placeholders, test secrets, and temporary credentials.
• Hash Text — Hash input text with browser-safe algorithms to verify content or compare signatures.
• UUID Generator — Generate RFC-style UUIDs for records, events, jobs, and temporary identifiers.
• ULID Generator — Generate sortable unique IDs that keep creation order clearer than random UUIDs alone.
• Password Generator — Generate strong, random passwords with customizable length and character sets. Copy to clipboard instantly.

Data Conversion

• Base64 String Converter — Encode or decode text as Base64 for APIs, tokens, fixtures, and debugging.
• JSON to CSV Converter — Convert JSON arrays to CSV format instantly in your browser. Download the result as a .csv file.

Text & Content

• Case Converter — Convert text between sentence, title, camel, pascal, snake, kebab, and uppercase styles.
• Text to ASCII Binary — Encode text as ASCII binary or decode binary sequences back into readable text.
• Text to Unicode — Inspect Unicode escape sequences and convert strings into their escaped representations.
• Slugify String — Turn titles and phrases into URL-safe, filename-safe, and ID-safe slugs.
• Email Normalizer — Normalize email addresses for comparison, cleanup, and deduplication workflows.
• Text Statistics — Count characters, words, lines, bytes, and reading-friendly metrics from raw text.
• Numeronym Generator — Turn long words into numeronyms like i18n and a11y for compact technical writing.
• Word & Character Counter — Count words, characters, sentences, paragraphs, and estimated reading time for any text. Great for blog posts, essays, social media, and SEO copy.
• Lorem Ipsum Generator — Generate placeholder text for web design, wireframes, and content mockups. Choose words, sentences, or paragraphs.

Design & Media

• Image Optimizer — Compress and convert images locally in the browser to reduce page weight and improve load performance.
• QR Code Generator — Free QR codes for links, Wi-Fi, contact cards, WhatsApp, email, SMS and text, with your logo and colours. Download PNG or SVG. Codes never expire.
• App Icon Generator — Turn one image into every app icon size for iOS, Android, Expo and the web, and download them as a ready-to-use ZIP.
• App Store Screenshot Generator — Turn raw phone screenshots into App Store and Google Play screenshots with headlines, backgrounds and a device frame, in every size the stores require.
• Color Contrast Checker — Test text and background combinations against WCAG readability targets before inaccessible UI ships.
• Viral Social Studio — Frame vertical video content inside platform safe zones and capture better thumbnails locally.
• Color Converter — Translate colors between hex, RGB, HSL, and CSS-safe formats for design and UI work.
• PX to REM Converter — Convert px to rem and back as you type, or convert a whole stylesheet at once. Works with any root font size.
• CSS Gradient Generator — Create linear and radial CSS gradients with a live preview and copy-ready CSS for backgrounds and UI.
• CSS Box Shadow Generator — Design CSS box shadows visually with offset, blur, spread, color, and inset controls, then copy the CSS.

Developer Workflow

• JSON Prettify — Format JSON into readable indentation for debugging, reviews, and documentation.
• JSON Minify — Strip whitespace from JSON when you need a compact payload or fixture string.
• Regex Tester — Test regular expressions against sample text and inspect match groups safely.
• Markdown Preview — Write Markdown and preview the rendered HTML side by side in real time. Perfect for README files and documentation.
• Text Diff Checker — Compare two blocks of text line by line and highlight added and removed lines.

Calculators & Time

• Date-Time Converter — Convert dates and timestamps between readable, ISO, and Unix-friendly formats.
• Integer Base Converter — Convert numbers across decimal, binary, octal, and hexadecimal representations.
• Percentage Calculator — Calculate percentages, percentage changes, and value-from-percent relationships.
• Unix Timestamp Converter — The current Unix time, live. Convert epoch seconds, milliseconds, micro- or nanoseconds to a date and back, with code for 9 languages.
• Aspect Ratio Calculator — Find the aspect ratio of any dimensions and scale width or height while keeping the same ratio.

Finance

• Mortgage Calculator — Calculate monthly mortgage payments, total interest, and view a full amortization schedule for any loan amount, rate, and term.
• ROI Calculator — Calculate return on investment, break-even point, and annualized ROI for any investment or marketing spend.
• Tip Calculator — Calculate tips and split bills between any number of people. Choose custom tip percentages or use presets.
• Compound Interest Calculator — Project investment growth with compound interest, regular monthly contributions, and adjustable compounding frequency.
• Discount & Sale Price Calculator — Calculate sale price, savings, and final total after a percentage discount and sales tax.