Free WCAG contrast checker. Test text and background colors against AA and AAA accessibility standards with a live preview. No sign-up. No sign-up, no watermark, 100% private.
Three steps, a few seconds — no account needed.
Set your text and background colors with the pickers or HEX inputs.
See the contrast ratio and whether it passes WCAG AA / AAA.
Tweak the colors until your text passes for the size you need.
Turn your file into a share-worthy AI Effect — one tap, no prompts.
Common formats are processed right in your browser; advanced formats use our secure server and are deleted immediately — never stored.
No queue and no daily limits. Use it as much as you want, free forever.
Download clean files immediately — no account, no email, no watermark.
SharkFoto's free contrast checker measures the contrast ratio between your text and background colors and tells you instantly whether it passes WCAG AA and AAA — so your designs stay readable for everyone, including low-vision users.
AA requires a ratio of 4.5:1 for normal text (3:1 for large text); AAA requires 7:1 (4.5:1 for large). Larger, bolder text needs less contrast to stay legible.
Aim for at least 4.5:1 for normal text (WCAG AA). 7:1 meets the stricter AAA level.
Roughly 18pt (24px) regular or 14pt (18.66px) bold and above — it can pass at a lower ratio.
It compares the relative luminance of the two colors using the WCAG formula, giving a ratio from 1:1 to 21:1.
Yes — free, no sign-up, and your files are processed securely and never stored.
Fast, clean and totally free — contrast checker done in seconds, no waiting around.
Love that my files are never stored. No sign-up, no watermark, just the result.
Bookmarked. The best free contrast checker I’ve found — simple and reliable.