OmniTools

Color Converter & Contrast Checker

Convert HEX, RGB, HSL, HSV, CMYK and test WCAG contrast accessibility.

Basis: sRGB (IEC 61966-2-1) and the WCAG 2.1 contrast ratio formula·2026-08-28 verified·Editorial policy

Before you rely on this

Values are in the sRGB color space. What you actually see or print shifts with display calibration, wider gamuts such as Display P3, and CMYK conversion. Contrast ratios use the WCAG 2.1 relative luminance formula; body text needs at least 4.5:1.

Tool Overview & Key Purpose

Convert between HEX, RGB, HSL, CMYK, and HSV color models with built-in eyedropper and WCAG contrast check.

Step-by-Step Usage Instructions

1STEP 1

Click on the color wheel canvas or type HEX/RGB values.

2STEP 2

Use the built-in [Eyedropper] tool to pick any color directly from your desktop screen.

3STEP 3

Copy converted HEX, RGB, HSL, or CMYK codes in one click.

4STEP 4

Check color accessibility score (WCAG AA/AAA compliance).

Real-World Scenarios & Practical Cases

3 Practical CasesScenario #1

UI Design System Palette Generation

Input primary brand HEX `#3B82F6` to automatically generate matching complementary and triadic palettes.

Fully compatible with Tailwind CSS color workflows.Scenario #2

Print CMYK vs Web RGB Conversion

Convert digital HEX `#FF5733` to commercial print CMYK `(0%, 66%, 80%, 0%)` for brochures.

Prevents print color shift discrepancies.Scenario #3

WCAG Accessibility Contrast Audit

Verify that text against background meets WCAG AA 4.5:1 minimum contrast ratio requirement.

Ensures legibility for visually impaired users.Color space and conversion basisStandard mathematical color space matrix transformations.

Pro Tips & Key Considerations

HSL model is often easiest for designers adjusting lightness and saturation programmatically.Use the EyeDropper tool to sample exact pixel colors anywhere on screen.

Frequently Asked Questions (FAQ)

Sources & References

W3C — CSS Color Module Level 4 MDN Web Docs — CSS <color> Value Reference

Basis: sRGB (IEC 61966-2-1) and the WCAG 2.1 contrast ratio formula · 2026-08-28 verified