Convert between HEX, RGB, HSL and test WCAG 2.1 contrast ratios.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Use the visual color picker or paste a HEX, RGB, HSL, or CSS color value.
Inspect live two-way conversions across HEX, RGB, HSL, HSV, and CSS variable formats.
Evaluate accessibility contrast scores against white and black backgrounds for compliance.
WCAG 2.1 AA requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text to ensure readability.
Yes, 8-digit HEX (RGBA) and HSLA transparent colors are fully supported.
Zero-egress companion tools in the Color & Palette suite
Generate lightweight CSS linear-gradient checkerboard grids for transparent canvas backgrounds.
Generate high-contrast, low-tension palettes (Base, +150°, +210°) on the 360° color wheel.
Generate modern iOS / macOS frosted glass cards with translucent borders and backdrop blurs.
Generate vibrant 4-color palettes spaced evenly at 90° angles around the color wheel.
