Why should I convert to OKLCH color space for modern CSS?

OKLCH is perceptually uniform across light and dark hues, ensuring that color transitions and gradients remain smooth without muddy gray tones.

How is WCAG 2.1 contrast calculated in real time?

The tool computes relative luminance using standard sRGB transfer functions and compares the color against white (#FFFFFF) and black (#000000) for AA and AAA compliance.

Universal Color Space Converter 100% In-Browser

Synchronized conversion across HEX, RGB, HSL, CMYK, and OKLCH with live WCAG accessibility audits

Graphic Color

Opacity:

Alpha

WCAG 2.1 Accessibility

ISO/IEC 40500

On White

On Black

Popular Tailwind Colors:

HEX Standard Web/CSS

RGB / RGBA

Red (0-255)

Green (0-255)

Blue (0-255)

HSL / HSLA

Hue (0-360°)

Sat (0-100%)

Light (0-100%)

CMYK (In Ấn Offset)

OKLCH (CSS Color 4)

Why Developers & Designers Need Multi-Format Color Space Conversion

In modern graphic design and frontend development, each color model serves a specific purpose: HEX and RGB for digital screens; HSL for intuitive tint and lightness adjustments; CMYK for commercial printing; and OKLCH—the cutting-edge CSS Color Module Level 4 model—for perceptually uniform transitions without muddy gray dead-zones in color gradients.

PhuDuy Tools Universal Color Converter calculates real-time bidirectional synchronization across all major color systems directly in browser memory. It features integrated WCAG 2.1 contrast ratio audits (AA/AAA compliance), alpha transparency adjustments, screen color sampling with the native EyeDropper API, and instant 1-click export for CSS, Tailwind, and Figma.

3 Easy Steps to Convert & Audit Colors

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1. Enter Value or Sample

Type any HEX, RGB, HSL, CMYK string or use the screen Eyedropper tool to pick any pixel.

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2. Check WCAG Contrast

Inspect live contrast ratios against black & white backgrounds to ensure accessibility standards are met.

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3. Copy Ready-to-use Code

Click Copy beside your target model: HEX, rgb(), hsl(), cmyk(), or modern CSS oklch().

Comparison: PhuDuy Color Studio vs Standard Color Pickers

Feature	PhuDuy Color Studio	Basic Color Pickers
5-Way Bidirectional Sync	✓ HEX, RGB, HSL, CMYK, OKLCH	Chỉ có HEX & RGB
Live WCAG 2.1 Contrast Audit	✓ Tự động tính AA & AAA	✕ Không có
Modern CSS OKLCH Support	✓ Tính toán ma trận D65 chính xác	✕ Rất hiếm công cụ hỗ trợ
Native Screen EyeDropper API	✓ Tích hợp EyeDropper API	Cần cài Extension trình duyệt
Privacy & Performance	✓ 100% In-Browser, Zero Latency	Nhiều quảng cáo làm chậm máy

Frequently Asked Questions

Why should I adopt OKLCH over RGB or HSL in CSS?

HSL has a known flaw: colors with the identical 50% lightness feel drastically different in perceived brightness to human vision (e.g. pure yellow appears far brighter than pure blue). OKLCH fixes this with perceptual uniformity, guaranteeing that colors with identical lightness values look equally bright, making dynamic palettes and smooth gradients superior.

What do WCAG 2.1 AA and AAA ratings mean for accessibility?

WCAG specifies minimum contrast ratios between foreground text and backgrounds to guarantee legibility for users with visual impairments. AA compliance requires at least 4.5:1 for body copy and 3:1 for large text. AAA requires 7:1 for body copy and 4.5:1 for large typography.