Free Developer Tools
Free, open-source utilities for building faster, more accessible websites — made by SGBP — Singapore Build Partners.
- Accessibility
Color Contrast Checker
Check whether any text/background colour pair passes WCAG 2.2 AA and AAA.
Open tool → - Utilities
Base64 Encoder / Decoder
Convert text to Base64 and back, UTF-8 safe, entirely in your browser.
Open tool → - Design
Color Palette Generator
Pick a base colour and get a matching palette of tints and shades.
Open tool → - Utilities
JWT Decoder
Decode a JSON Web Token’s header and payload — nothing leaves your browser.
Open tool → - SEO
Schema Markup Validator
Check your JSON-LD structured data is valid and uses schema.org correctly.
Open tool → - Design
Border Radius Generator
Round each corner with sliders, preview live, and copy the CSS.
Open tool →