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Color Contrast Ratio Batch Checker

Batch-check foreground/background hex color pairs against the real WCAG contrast formula, with AA/AAA pass-fail for normal and large text.

Free to use

Color Pairs

One foreground,background hex pair per line.

WCAG Contrast Results

Enter color pairs to check WCAG contrast ratios.

How to Use

Enter one foreground/background hex color pair per line (e.g. #000000,#FFFFFF). For each pair, the tool computes the WCAG 2.x relative luminance of both colors using the standard sRGB-to-linear transform, then the contrast ratio between them ((L1+0.05)/(L2+0.05), lighter over darker). Each row shows a live swatch preview, the exact ratio to two decimal places, and pass/fail against all four WCAG thresholds: AA normal text (4.5:1), AA large text (3:1), AAA normal text (7:1), and AAA large text (4.5:1). Pure black on white computes to the textbook 21.00:1 maximum ratio.

About Color Contrast Ratio Batch Checker

Batch-check foreground/background hex color pairs against the real WCAG contrast formula, with AA/AAA pass-fail for normal and large text.

How to use this tool

  1. Enter the requested data or choose an upload.
  2. Check the file type and size limit before submitting.
  3. Review the result, then download or copy it.
  4. Keep the original and use the actions above to continue safely.

Read the full Color Contrast Ratio Batch Checker guide →