WCAG & Accessibility·2 min read

Color Contrast Checker: how it works and when to reach for it

Most of these utilities used to live as command line scripts on someone's laptop. We rewrote them as browser tools so you do not need to install anything to use them. Check text and background colors against WCAG 2.1 contrast requirements in real time. Get pass/fail for AA and AAA, large text and UI components, plus the nearest compliant shade of your own color. Extract palettes from images. Free, in-browser.

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What Color Contrast Checker actually does

The honest one-paragraph version.

Check text and background colors against WCAG 2.1 contrast requirements in real time. Get pass/fail for AA and AAA, large text and UI components, plus the nearest compliant shade of your own color. Extract palettes from images. Free, in-browser.

It runs in your browser. Nothing you paste, drop, or generate leaves your device, which matters when you are dealing with client data or unreleased work.

Who reaches for this

If any of these sound like you, the tool earns its bookmark.

Built mainly for people building on the web. If you have ever needed wcag aa/aaa contrast ratios with suggested compliant colors, you are the audience.

If you are not sure whether this is for you, open it and try one sample. You will know inside ten seconds.

How to use it

Three steps. The tool does the rest.

Open the tool, drop in the input, and the result appears.

Open the tool from the link below.
Paste, drop, or type your input.
Read the output. Copy it, download it, or tweak the settings and try again.

Why use Color Contrast Checker instead of another option

Three reasons that hold up in practice.

Tool sites usually push you toward a Pro upgrade after three uses. We do not have a Pro tier at all. Every feature is free for everyone.

WCAG tools at mytoolstudio share three rules. They run in the browser whenever possible. They never lock features behind sign up. And they keep your data on your device unless server work is the only way.

Tips that save time

Small habits that compound across a workweek.

If you collaborate over chat, paste the input here first to normalize formatting before sharing.

If you collaborate over chat, paste the input here first to normalize formatting before sharing.
Keep this open in a pinned tab. Most developers run it five to ten times a day.
Pair it with your editor's keyboard shortcut for opening URLs and you can flow through it without breaking focus.

Open Color Contrast Checker

Stop reading. Start using.

That is everything worth saying. Open the tool and try it on something real. You will know within a minute whether it belongs in your kit.

Related research

If you found this useful, the other WCAG guides are written in the same voice. We keep them short, practical, and rooted in real work.

About the makers

mytoolstudio is designed and built by the team at GAP3, a small studio that ships product, brand, and growth work for early stage companies. We built this site as a free public good. Read more about us at gap3.co.

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