What is the Contrast Checker?
Check WCAG contrast between two colors. The Contrast Checker is a free online tool that works instantly in your browser — no installation, no signup and nothing to upload. It sits alongside other Color tools on DevNibble such as Color Converter, Color Palette Generator, Nearest CSS Color Name.
How to use the Contrast Checker
- Enter your values in the fields.
- The result is calculated instantly as you type.
- Copy the output.
Features
- Runs 100% in your browser — your data is never uploaded or stored.
- Free forever, with no account, no ads and no tracking.
- Copy or download your result in one click.
- Fast and responsive on desktop, tablet and mobile.
Frequently asked questions
Is the Contrast Checker free to use?
Yes — Contrast Checker is completely free with no sign-up, no ads and no limit on how many times you can use it.
Is my data private when I use the Contrast Checker?
Everything happens locally in your browser. Your input is never sent to a server, which makes Contrast Checker safe to use with private or sensitive data.
How do I use the Contrast Checker?
Pick or enter a color and Contrast Checker shows the converted values and previews instantly.
Do I need to install anything to use the Contrast Checker?
No installation and no account required — Contrast Checker runs entirely in your web browser on desktop and mobile. Check WCAG contrast between two colors.