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Color converter: HEX, RGB, HSL, HSV, CMYK

Convert between HEX, RGB, HSL, HSV and CMYK. Live preview. WCAG contrast checker for accessibility. Nothing leaves your browser.

How Color Converter works

Color Converter translates any color between HEX, RGB, HSL, HSV, and CMYK formats instantly as you type. It also runs a WCAG contrast check between any two colors you pick, showing the contrast ratio and the AA/AAA pass/fail result for normal text, large text, and UI components. All calculations happen in the browser with no data sent anywhere; nothing you type leaves your device.

Understanding how the same color looks across color models is useful in design handoffs. A designer might specify a brand color as HEX #1A4F8C; a CSS developer needs the HSL equivalent for theming; a print team needs the CMYK breakdown. This tool does the conversion in all directions at once so you never have to run multiple separate converters.

Written by Bastien Sulyan

How to use Color Converter, step by step

  1. Type a HEX value, click a color swatch, or enter RGB, HSL, HSV, or CMYK values into the respective fields.
  2. All other format representations update immediately to show the equivalent color.
  3. To run a contrast check, select a foreground color and a background color using the two color pickers.
  4. Read the WCAG contrast ratio and the pass/fail badges for AA and AAA compliance levels.
  5. Copy any color value using the copy icon next to each field.

Common use cases

  • A UI designer converts a brand HEX code to HSL to write a CSS custom property for a theming system.
  • A web developer checks the contrast ratio between their text color and background before shipping a component to confirm WCAG AA compliance.
  • A print designer receives a web HEX color and needs the CMYK equivalent to match it in a printed brochure.
  • A developer needs the RGB breakdown of a design token to pass individual channel values to a canvas drawing function.

Frequently asked questions

Does the tool support alpha (transparency) values?

The current converter works with fully opaque colors (alpha = 1). HEXA (8-digit hex) and RGBA are not yet in scope. For opacity, set the alpha channel in your CSS separately using the rgba() or oklch() notation.

Are the colors I enter stored or sent anywhere?

No. Color conversion is pure arithmetic (channel remapping and range scaling) that runs entirely in the browser's JavaScript engine. Nothing you type here reaches any server or external service.

What WCAG contrast levels does the checker support?

The tool reports against WCAG 2.1 success criteria: AA requires a minimum contrast ratio of 4.5:1 for normal text (below 18pt or 14pt bold) and 3:1 for large text and UI components. AAA requires 7:1 for normal text and 4.5:1 for large text.

Why do CMYK values differ between this tool and professional design software?

The RGB-to-CMYK conversion this tool performs is a mathematical formula without a color profile. Professional design applications apply ICC color profiles that account for ink dot gain and substrate properties. The CMYK values here are useful for approximation; for production print, always apply your press profile in dedicated software.

Can I convert a CSS color name like 'cornflowerblue' here?

CSS named colors are not directly typed into the converter fields. To convert a named color, first find its HEX value in a CSS reference (cornflowerblue is #6495ED), then paste that HEX into the HEX field to see all other formats.

Does the tool work offline after the page loads?

Yes. Color conversion is arithmetic with no external dependency. Once the page is in your browser cache you can open it without a network connection and all conversions will work normally.

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