Color Utility
Convert HEX, RGB, HSL colors and check WCAG contrast ratio for accessibility.
Color Conversion
Contrast Checker (WCAG)
The quick brown fox jumps over the lazy dog.
Recent Articles
Generating QR Codes: Faster and Safer
Using Canvas API and node-qrcode to achieve real-time generation and privacy protection entirely within the browser.
Solving JSON to TypeScript via Recursion: The Strength of Zero Dependencies
Generate type definitions instantly from API responses. A behind-the-scenes look at a lightweight, high-speed implementation using recursive algorithms.
Secure JWT Verification in the Browser: A Security Engineer's Perspective
Handling sensitive tokens safely. Why we used the 'jose' library and local processing for our JWT tool design.
Safe Without Data Transmission: The Background of Our Browser-based Diff Tool
How we designed a private, high-speed text comparison tool using browser-side computing to prioritize user privacy.
Library-Free Timezone Conversion: The Power of Intl API
The story behind a lightweight timezone processing tool implemented using only the browser's native Intl API, without Moment.js or date-fns.
The Story Behind SQL to ER Diagram: A Commitment to Browser-only Execution
Discover the background of our SQL-to-ER tool and the technical challenges of balancing security with convenience.