Developer & Web Design Tools
Everyday utilities for developers and web designers. Format and validate JSON, test a regular expression, encode or decode Base64 and URLs, pick colours and check contrast, or look at a site's SSL certificate and security headers.
Aspect Ratio Calculator
Calculate missing image or video dimensions, simplify ratios, and convert between aspect ratios. Presets for 16:9, 4:3, 1:1, social media, and more.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 strings. Supports UTF-8 and URL-safe encoding.
Colour Picker
Find the perfect colour for your web design with our interactive colour picker tool.
CSS Gradient Generator
Create linear, radial and conic CSS gradients with a live preview, multiple colour stops, and ready-to-use CSS code.
DNS Lookup
Query DNS records for any domain. View A, AAAA, MX, TXT, NS, CNAME, and SOA records.
Favicon Generator
Generate favicons in all required sizes from a single image. Create ICO, PNG, and Apple Touch icons.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text. Useful for checksums and data integrity.
HTML, CSS & JS Minifier
Strip comments and unnecessary whitespace from HTML, CSS or JavaScript to shrink file size before deployment.
IP Subnet Calculator
Calculate network address, broadcast address, usable host range and subnet mask from an IP address and CIDR prefix.
JavaScript Obfuscator
Protect your JavaScript code by making it harder to read and understand while maintaining functionality.
JSON Formatter
Format, validate, and beautify JSON data with syntax highlighting.
JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, claims, and check expiry status.
Markdown to HTML
Convert Markdown to clean HTML with live preview. Supports tables, code blocks and task lists. Runs entirely in your browser.
Number Base Converter
Convert numbers between binary, decimal, hexadecimal, and octal bases instantly.
Regex Tester
Test and debug regular expressions with real-time matching and highlighting.
Security Header Checker
Check website security headers and get recommendations to improve your website's security posture.
SSL Certificate Checker
Check SSL certificate details, expiry dates, and issuer information for any website.
Text Diff Tool
Compare two texts side-by-side and highlight differences. Useful for code review and document comparison.
Unix Epoch Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports multiple timezones.
URL Encoder/Decoder
Encode or decode URLs and query parameters. Supports component and full URL encoding modes.
UUID Generator
Generate UUID v1, v4, v7, or nil UUIDs in bulk. Multiple formats including hyphenated, braces, and Base64.
WCAG Colour Contrast Checker
Check colour contrast ratios for WCAG 2.1 AA and AAA compliance with live preview and suggested accessible alternatives.
What's My IP Address?
Discover your IP address and get detailed information about your internet connection.
WHOIS Lookup
Look up domain registration information including registrar, creation date, and nameservers.