Free Online Colour Converter
Paste a value in any notation and the others update instantly, including the WCAG contrast ratio you need before shipping a button colour.
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How to use Colour Converter
- Type or pick a colour.
- Read HEX, RGB and HSL.
- Check contrast on light and dark backgrounds.
Questions about Colour Converter
What contrast do I need?
4.5:1 for normal body text and 3:1 for large text under WCAG AA.
Why does my HEX look different on the phone?
Screens apply colour profiles; the numeric values are identical even when perception is not.
About Colour Converter
Convert colours between HEX, RGB and HSL with our free online Colour Converter. 100% browser-based, fast, and private—no login or file uploads required.
These calculators and converters turn everyday numbers into answers instantly: percentages, BMI, loans and interest, units, colours and dates, with the formula shown so you can check the working.
This tool runs in your browser. The file is not uploaded. Results update as you type and are rounded for display; for money or legal figures keep the unrounded value and double-check against your own spreadsheet before relying on it.