WCAG Color Contrast Checker.
Calculate WCAG 2.x relative luminance, contrast ratios and applicable thresholds locally. Data stays in this browser. Calculate WCAG 2.x relative luminance, contrast ratios and applicable thresholds locally.
- ✓Runs in your browser
- ✓No account required
- ✓Verified output
Use WCAG Color Contrast Checker
Private in this browser. Code, colors, font bytes, metadata and output stay in this browser.
No file selected.
Preparing the local tool…
Verified result
Download resultHow it works
- 01
Paste or choose a source.
- 02
Run the bounded local inspection.
- 03
Download the independently verified report.
Frequently asked questions
Does the tool execute analyzed content?
No. The bounded parser treats it only as data.
Does WCAG Color Contrast Checker upload my data?
WCAG Color Contrast Checker runs locally in your browser. Code, colors, font bytes, metadata and output stay in this browser.
What output does WCAG Color Contrast Checker create?
WCAG Color Contrast Checker creates Json output after the result passes its local verification checks.
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