Free developer tools
Small browser-only utilities — nothing uploaded.
Colour
Tailwind CSS color palette generator
Turn one hex code into a full Tailwind color scale — 11 OKLCH-tuned shades from 50 to 950, with contrast ratios, ready to paste into Tailwind v4's @theme block or a v3 config. Free, no sign-up, runs in your browser.
Colour contrast checker with WCAG suggestions
Check any two colours against WCAG 2 — normal text, large text and UI components — see the ratio and live samples, and get the nearest passing colour when a pair fails, adjusted in OKLCH so the hue stays yours. Free, runs in your browser.
SEO
Meta tag generator with Google SERP preview
Fill in a title, description, canonical and Open Graph image and get the complete <head> snippet — with a live Google result preview that measures your title and description in pixels, not characters, so you can see exactly where they will be cut.
JSON-LD schema generator and validator
Build valid JSON-LD structured data for Article, FAQPage, Product, Organization and BreadcrumbList from a form, or paste existing markup to have it pretty-printed and checked for the mistakes that stop a rich result appearing. Free, runs in your browser.
robots.txt generator with validation
Build a robots.txt from user-agent groups, allow and disallow rules, crawl-delay and sitemap URLs — with presets for allowing everything, blocking AI crawlers, or locking down a staging site, and warnings for the mistakes that quietly block your whole site.
UTM link builder and campaign URL generator
Build correctly encoded UTM tracking links from a URL and your source, medium and campaign — with the existing query string and fragment preserved, values properly percent-encoded, and warnings for the capitalisation and spacing that split one campaign across several rows in an analytics report.
OG image generator — free 1200×630 social cards
Generate an Open Graph image for any page: type a title, pick a theme, download a 1200×630 PNG. Runs entirely in your browser — no account, no upload, no watermark.
Convert
SVG to JSX converter for React components
Paste an SVG and get a React component back — attributes camelCased, class turned into className, style strings converted to objects, xmlns removed, with optional currentColor, a size prop and TypeScript output. Runs entirely in your browser; nothing is uploaded.
Image converter — WebP, AVIF, JPEG and PNG
Convert and resize images to WebP, AVIF, JPEG or PNG at the quality you choose, see exactly how many bytes each one saved, and download them one at a time or as a zip. Everything happens in your browser — no image is uploaded.
JSON to TypeScript — generate interfaces from a payload
Paste a JSON payload and get TypeScript interfaces: merged array shapes, optional properties, and real unions instead of any. Runs in your browser — nothing is uploaded.
Remove EXIF data from photos — image metadata remover
Strip EXIF, GPS location and other hidden metadata from JPEG, PNG and WebP images without re-encoding — see what each file carries first. Nothing is uploaded.
Text
Dev
CSS clamp() calculator for fluid typography
Generate a responsive CSS clamp() font size from a minimum and maximum size and the viewport range they should grow across — with the slope and intercept shown, a live preview, and the rendered size at every common screen width. Free, no sign-up.
Favicon generator — .ico, PNG set and manifest
Turn a PNG or SVG, or just a couple of letters, into the full favicon set: 16, 32, 48, 180, 192 and 512 PNGs, a real multi-size favicon.ico, a web app manifest and the <head> tags. Everything runs in your browser — nothing is uploaded.
JSON formatter and validator — free, in your browser
Format, minify and validate JSON in your browser. Broken documents get the exact line and column of the error. Nothing is uploaded, and there is no size limit but your machine.
Mobile
App icon generator — iOS, Android and Expo icon sizes in one zip
Turn one 1024px image into every iOS, Android and Expo app icon — an Xcode appiconset, mipmap launcher PNGs and an adaptive icon, zipped in your browser.
Privacy policy generator for apps, with terms of use
Generate a privacy policy and terms of use for your app in Markdown — tick what it collects, from analytics and ads to AI, plus GDPR, CCPA and COPPA sections.