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Contrast Checker — Free Online Validator

Contrast Checker checks your contrast and points at the exact problem rather than just reporting "invalid". Check color accessibility. It runs entirely in your browser, so nothing you enter is uploaded to a server. Free to use, with no signup and no watermark.

How to use Contrast Checker

1. Paste the contrast you want checked.
2. Read the validation result.
3. Fix what is flagged, then re-check.

Frequently asked questions

What exactly does it check?

It verifies that your contrast is well-formed and reports the position and nature of any problem found.

Is my input uploaded?

No. Validation runs entirely in your browser, so private data is safe to paste.

Why does it say valid when something still looks wrong?

Validation confirms structural correctness, not that the content means what you intended.

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