Free Developer Tools
Free, open-source utilities for building faster, more accessible websites — made by SGBP — Singapore Build Partners.
-
AccessibilityColor Contrast Checker
Check whether any text/background colour pair passes WCAG 2.2 AA and AAA.
Open tool → -
UtilitiesBase64 Encoder / Decoder
Convert text to Base64 and back, UTF-8 safe, entirely in your browser.
Open tool → -
DesignColor Palette Generator
Pick a base colour and get a matching palette of tints and shades.
Open tool → -
UtilitiesJWT Decoder
Decode a JSON Web Token’s header and payload — nothing leaves your browser.
Open tool → -
SEOSchema Markup Validator
Check your JSON-LD structured data is valid and uses schema.org correctly.
Open tool → -
DesignBorder Radius Generator
Round each corner with sliders, preview live, and copy the CSS.
Open tool → -
DesignCSS Grid Generator
Set columns, rows and gap with sliders, preview live, and copy the CSS.
Open tool → -
UtilitiesEmail Validator
Check whether one or many email addresses are validly formatted.
Open tool → -
UtilitiesRegex Tester
Test a regular expression with live match highlighting and capture groups.
Open tool → -
BusinessCurrency Converter
Convert USD to SGD and more using live reference exchange rates.
Open tool → -
PerformanceImage to WebP Converter
Convert PNG/JPG/GIF to WebP in your browser — nothing is uploaded.
Open tool →