Color Contrast Checker
Use Color Contrast Checker on AboveTool for color, gradient, QR, OG image, and design utilities — private browser tools, no signup.
Color Contrast Checker
used to check whether a foreground and background color combination meets WCAG AA or AAA accessibility contrast ratio requirements
contrast requirements differ by text size — large text (18pt or 14pt bold) only needs a 3:1 ratio for AA, while normal text requires 4.5:1
About Color Contrast Checker
Color Contrast Checker is used to check whether a foreground and background color combination meets WCAG AA or AAA accessibility contrast ratio requirements. It calculates the relative luminance of both colors using the WCAG formula and computes the contrast ratio against the 4.5:1 (AA) and 7:1 (AAA) thresholds. Contrast requirements differ by text size — large text (18pt or 14pt bold) only needs a 3:1 ratio for AA, while normal text requires 4.5:1. Color Contrast Checker runs free in your browser at abovetool.com — no signup required.
How to use
- Pick colors or fill the generator/reference fields for this design utility.
- Click Run (many tools also update live as you type).
- Copy CSS/values or download PNG/QR/OG assets — processing stays in your browser.
Features
- Color converters, contrast, harmonies, gradients, and references
- Generators for QR, OG images, favicons, ASCII, and swatch cards
- Live previews with copy-ready CSS and HEX values
- Dedicated picker and gradient library keep their own UIs
Frequently asked questions
Is Color Contrast Checker free on AboveTool?
Yes. Color Contrast Checker is free to use on abovetool.com with no account required.
Are my files uploaded to a server?
Most tools on AboveTool process files locally in your browser. Your content stays on your device.
Who is this Design & Creative tool for?
Anyone who needs quick Color Tools tasks without installing desktop software — students, developers, designers, and office teams.