What standard does the readability check use?

The international web accessibility standard, WCAG. Body text passes at a contrast ratio of 4.5:1 or higher, large text at 3:1 — the stricter AAA levels are 7:1 and 4.5:1.

Why should I check text contrast?

Low contrast strains the eyes and hurts readability. In Korea, public institutions and large companies are legally required to meet contrast standards.

Color Contrast Checker

Is your text easy to read against its background? Enter a text color and a background color, and we'll tell you right away whether it's readable.

Text color

Background color

When to use it

Check whether your text and background colors have enough contrast to read, against the WCAG standard.
Korea's anti-discrimination law makes contrast compliance mandatory for public institutions and large corporate sites — good for pre-audit checks.
Body text (4.5:1) and large text (3:1) thresholds are judged together with the stricter AAA levels, all at once.

Frequently asked questions

: The international web accessibility standard, WCAG. Body text passes at a contrast ratio of 4.5:1 or higher, large text at 3:1 — the stricter AAA levels are 7:1 and 4.5:1.
: Low contrast strains the eyes and hurts readability. In Korea, public institutions and large companies are legally required to meet contrast standards.