Contrast Checker
FreeCheck color contrast ratio for WCAG accessibility compliance
Sample text
The quick brown fox jumps over the lazy dog.
4.47:1
About Contrast Checker
Accessible color pairings are not optional, and guessing whether text is readable against a background invites both usability problems and WCAG audit failures. The exact contrast ratio between two colors determines whether they pass at the AA or AAA level for normal and large text. The Contrast Checker calculates that ratio for any foreground and background pair and tells you which accessibility thresholds it meets.
Enter your two colors and the tool computes the contrast ratio and shows the pass or fail result against the relevant WCAG criteria. It runs in your browser with no signup and no watermark, and your color values stay on your device. It is a quick way to verify that your text remains legible before shipping, helping you catch contrast issues during design rather than in an accessibility review later.
Common uses
- Verifying that body text meets WCAG AA contrast against its background.
- Checking whether a button's label is readable on its fill color.
- Testing link and placeholder colors for sufficient contrast before launch.
- Comparing two palette options to pick the more accessible pairing.
- Documenting that a design passes contrast requirements for an accessibility review.
How to use
- 1
Configure options
Set your preferences using the options panel below.
- 2
Click Generate
Click the process button to generate your result instantly.
- 3
Copy or download
Copy the result to clipboard or download it directly to your device.
Why ToolHub?
- Instant text processing
- Color tools included
- Privacy-first browser processing
FAQ
What contrast standards does it check against?
It reports the contrast ratio and whether the pair meets WCAG thresholds for normal and large text at the AA and AAA levels.
Why does large text pass when small text does not?
WCAG allows a lower contrast ratio for large text, so the same color pair can pass for headings while failing for body copy.
Which colors count as foreground and background?
You provide both colors, typically your text color and the surface behind it, and the tool computes the ratio between them.
Is my data sent to a server?
No. The contrast calculation runs in your browser, so your color values stay local.
Can I use Contrast Checker on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.