HTTP Status Code Reference
Search every standard HTTP status code.
Web & Dev Tools
Cron, contrast, CSS generators & dev references.
MIME Type Lookup
Find the MIME type for any file extension.
User-Agent Parser
Decode a User-Agent into browser, OS and device.
URL Parser
Break a URL into its parts and query params.
UTM Campaign URL Builder
Add UTM tracking parameters to any link.
CSS Unit Converter
Convert between px, rem, em, pt and percent.
Colour Contrast Checker
Test text contrast against WCAG AA and AAA.
CSS Box Shadow Generator
Design a box-shadow with sliders and live preview.
CSS Gradient Generator
Build linear and radial gradients with a live preview.
CSS Border Radius Generator
Round each corner with sliders and a live preview.
.gitignore Generator
Combine ignore templates for your stack and tools.
Cookie Header Parser
Decode Cookie and Set-Cookie headers into fields.
ASCII Table Reference
Searchable ASCII table with dec, hex, oct and binary.
Chmod Calculator
Build Unix file permissions visually.
Cron Builder Explainer
Build and decode cron schedules in plain English.
Crontab Explainer
Turn a cron expression into plain English.
CSS Animation Generator
Build @keyframes and animation shorthand in seconds.
CSS Clip-path Generator
Generate CSS clip-path shapes with a live preview.
CSS Grid Generator
Visually build CSS grid layouts and copy the code.
CSS Specificity Calculator
Score any CSS selector as an (a,b,c) triple.
CSS Triangle Generator
Make pure-CSS triangles with the border trick.
Cubic Bezier Editor
Craft CSS easing curves visually.
cURL to Fetch
Turn a cURL command into JavaScript fetch code.
Docker Compose Generator
Scaffold a docker-compose.yml with databases and cache.
Dockerfile Generator
Scaffold a clean Dockerfile in seconds.
Domain Parser
Split any host into subdomain, domain and TLD.
Dotenv Example Generator
Turn a .env file into a safe .env.example.
.editorconfig Generator
Build an .editorconfig file in seconds.
Flexbox Grid Playground
Tweak flexbox visually and copy the CSS.
HTML Boilerplate Generator
Build a clean HTML5 starter document in seconds.
HTML Escape Unescape
Encode or decode HTML special characters.
HTTP Header Reference
Searchable guide to common HTTP headers.
Keyframes Spinner Generator
Build a CSS loading spinner, copy the code.
License Picker
Choose an open-source licence and get the text.
Lorem Picsum URL Builder
Build placeholder image URLs for Lorem Picsum.
Media Query Generator
Build responsive CSS media queries in seconds.
Meta / OG Tag Generator
Generate SEO, Open Graph and Twitter Card meta tags.
Nginx Config Generator
Build an nginx server block in seconds.
Open Graph Preview
See how your link looks when shared.
Port Number Lookup
Find the service behind a TCP/UDP port.
README Generator
Build a clean README.md from a few project fields.
Regex Cheatsheet
Searchable regex reference with a live tester.
Semantic Version Bumper
Bump a semver string by major, minor, patch or prerelease.
Shields Badge Generator
Build shields.io badge URLs, Markdown and HTML.
SVG Optimizer
Shrink SVG markup losslessly in your browser.
Twitter Card Preview
Preview your twitter:card meta tags before you share.
Unicode Character Explorer
Inspect code points, escapes and UTF-8 bytes per character.
About Web & Dev Tools
A toolbox of web-development references and generators: HTTP status code lookup, MIME type search, User-Agent and URL parsers, cookie inspectors, CSS generators for gradients, box-shadows, clamp() fluid type and border-radius, plus builders for robots.txt, .htaccess and UTM-tagged URLs. Everything runs client-side, so a URL you parse or a header you inspect is never sent anywhere — safe for internal endpoints and staging URLs. The references are searchable and fast enough to keep open in a spare tab; the generators output copy-ready code you can paste straight into your project.