Color Contrast Checker
Free online color contrast checker that runs entirely in your browser.
How the Color Contrast Checker works
The Color Contrast Checker works on Text color (hex), Background color (hex) and shows the result as you type. The same input always gives the same answer — refresh the page and you will see exactly the same figure.
Formula used
Color Contrast Checker is computed by the formula below, using the inputs you provide.
Inputs used: Text color (hex), Background color (hex).
Worked example
Take the default example — text color (hex) of #111111, background color (hex) of #ffffff:
- ratio: 18.88
Frequently asked questions
- Is the Color Contrast Checker free?
- Yes. There is no signup, no usage limit and no watermark — the checker runs entirely in your browser.
- Does the Color Contrast Checker store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.
- What inputs does the Color Contrast Checker need?
- Text color (hex), Background color (hex). Change any of them and the result updates instantly.