ToolNest

🎨Color Contrast Checker

Check WCAG 2.1 color contrast ratios for accessibility.

🆓 Free🔒 Secure⚡ Instant📱 Mobile-friendly🚫 No signup

Check color contrast ratios for WCAG AA and AAA accessibility compliance online for free.

Sample Text Preview

This is how your text looks on this background.

Contrast Ratio: 21.00:1

✓ AA Normal Text✓ AA Large Text✓ AAA Normal Text✓ AAA Large Text

WCAG 2.1 guidelines: AA requires 4.5:1 (normal) or 3:1 (large). AAA requires 7:1 (normal) or 4.5:1 (large).

How to Use Color Contrast Checker — Step by Step

  1. 1Enter the foreground color (text) and background color in HEX or RGB
  2. 2The contrast ratio is calculated instantly
  3. 3WCAG AA and AAA compliance is shown for normal text and large text
  4. 4Adjust colors until you meet accessibility requirements

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Frequently Asked Questions

Is this tool completely free?

Yes. All ToolNest tools are 100% free with no signup required, no account, and no watermarks added to output files.

Are my uploaded files secure and private?

All uploads use HTTPS encryption during transfer. Files are processed on secure isolated servers and automatically deleted within 2 hours of upload.

Does this tool work on mobile phones?

Yes. ToolNest works on any modern browser on iPhone, Android, tablet, or desktop — no app download or plugin needed.

Do I need to create an account?

No. Just open the tool, upload your file, and download the result. No email, no signup, no password.