Calculate relative luminance ($Y = 0.2126R + 0.7152G + 0.0722B$ for Rec. 709) across broadcast video standards.
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.
RGB [0, 255] ⇄ HSL [0°, 360°, %] ⇄ HEX #RRGGBB ⇄ LAB / LCHHEXRGBHSL“Converting pure cobalt blue across color spaces.”
Parse hex pairs into 8-bit integers.
Calculate cylindrical coordinates.
The color is mathematically normalized across all target web design models.
Use the visual color picker or paste any valid HEX, RGB, or HSL code.
Examine real-time conversion values across all supported color formats.
Click on any color value to copy it directly in standard CSS syntax.
Contrast ratios are calculated using relative luminance: (L1 + 0.05) / (L2 + 0.05), where L1 is the lighter color and L2 is the darker color, according to WCAG 2.1 criteria.
Utilifie is 100% free with zero data tracking. Support continuous development and tool elevations.
Zero-egress companion tools in the Color & Palette suite
Calculate precise gamma-corrected relative luminance ($Y$) to verify human eye green-channel sensitivity weighting.
Compare rectangular box-shadows against alpha-aware drop-shadow filter contours.
Calculate the official ISO/CIE 11664-6 CIEDE2000 perceptual color distance ($Delta E_{00}$) between two LAB colors with lightness, chroma, and hue weighting.
Explore modern OKLCH color space with Lightness, Chroma, and Hue sliders and Hex/RGB/HSL conversion