Enter a foreground and background color in RGB hexadecimal format or choose a color using the Color Picker. Enter an Alpha value to adjust the transparency of the foreground color. Use the Lightness slider to adjust the perceived lightness of the color.

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Web accessibility testing can be difficult! The experts at WebAIM can audit your web site and provide a detailed report to help you remediate accessibility and WCAG compliance issues.

Hint: Use the eye dropper tool in the Color Picker to extract the color value from any element on screen. Additionally, WAVE can analyze contrast ratios for all page text elements at once.

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A miniature version of this Contrast Checker can be initiated within any web page by installing and using the Contrast Checker Bookmarklet. This tool allows easy contrast testing of any content on your screen by using the foreground and background eyedropper tools.

This tool also functions as a basic API. Simply append &api to any permalink to get a JSON object with the contrast ratio and the AA/AAA pass/fail states. For example: https://webaim.org/resources/contrastchecker/?fcolor=0000FF&bcolor=EEEEEE&api.

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WCAG 2.0 level AA requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. WCAG 2.1 requires a contrast ratio of at least 3:1 for graphics and user interface components (such as form input borders). WCAG Level AAA requires a contrast ratio of at least 7:1 for normal text and 4.5:1 for large text.

Our software update is being released in phases. New features will gradually roll out across all regions. Stay tuned for updates.

Institute for Disability Research, Policy, and Practice Utah State University 6807 Old Main Hill Logan, UT 84322-6807 435.797.7024