Contrast checker: what it is and how to use it
Contrast checker: WCAG contrast ratio check. Fast and free in your browser.
June 22, 2026 · 2 min read
Contrast checker: what it is and how to use it
What is Contrast checker?
Contrast checking measures WCAG ratios between text and background colors. CodeGrid Tools runs locally; codes stay private and you can iterate quickly. Not a substitute for a full accessibility audit. Turkish UI helps public-sector checks. This guide explains when Contrast checker helps and how to run it step by step in CodeGrid Tools.
When is it useful?
- WCAG contrast ratio check
- Runs in your browser—no extra software required
How to use it in CodeGrid Tools
Step 1: Choose Text and Background
Pick the two colors.
Step 2: Read the Ratio
Check the AA and AAA lines.
Step 3: Apply the Suggestion
If contrast is low, switch to the recommended text color.
Tips
- Use an up-to-date browser (Chrome, Edge, Firefox, or Safari).
- Large files may take longer depending on your device.
FAQ
What is the difference between WCAG AA and AAA?
AA is the general accessibility baseline, while AAA requires stricter contrast and is not necessary in every case.
What counts as large text?
For bold text or 18pt and above, a 3:1 ratio may be sufficient for AA; check the large-text line in the tool.
Is contrast alone enough for color blindness?
No. Contrast helps, but you should also support meaning with shape, icons, and weight.
Use Contrast checker →