ContrastChecker.online
contrastchecker.onlineShare a colour pair with its WCAG text-contrast result.
Share a colour pair with its WCAG text-contrast result.
Compare text contrast with its size, weight and colour direction in view.
Sample a foreground and background pair and copy its contrast report.
Check text and interface contrast with transparency and lightness controls.
Adjust text and background colours while checking their contrast.
See how a colour pair performs for different text sizes.
Find replacement colours that meet a chosen contrast target.
Practical web-accessibility checks linked to WCAG criteria
Adjust CSS colour pairs and inspect their changing contrast ratio.
Shape a complete interface palette while checking colour-pair contrast.
Adjust CSS colours and calculate contrast with focused JavaScript functions.
Build interface colour scales with shade curves and contrast targets.
Choose numbered shades whose separation indicates minimum contrast.
Compare a text and background pair with editable colour values.
Add automated accessibility rule checks to an existing browser UI test flow.
Generate interface themes from target contrast ratios and colour scales.
Standards and guidance for accessible digital experiences
View text contrast through different vision and lighting simulations.
Scan a web page for common accessibility issues, then follow guided checks for keyboard and manual review.
Check colour pairs, sample an image and collect results for a PDF.
Multilingual retail and custom type with script labels and full-family trials.
Extract image colours and document their roles in a shareable brand guide.
Connect browser colour picking with shareable palettes and scales.
Compare colour pairs interactively or check a complete palette in code.