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Colour Contrast Checker

Check text and background contrast against WCAG AA and AAA levels.

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Input

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Settings

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Run

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Results

Results will appear here once you run the tool.

About Colour Contrast Checker

Check text and background contrast against WCAG AA and AAA levels. Colour Contrast Checker needs no input file — choose your settings and it generates the result straight away.

Your files stay on your device. ZyncTools has no upload step: the file is read in your browser, processed there, and handed straight back to you. There is no account, no watermark and no size cap beyond what your own device can hold.

Settings. Colour Contrast Checker gives you control over text colour, background colour, font size and bold text.

Also known as: contrast, accessibility, wcag, a11y, color.

How to use Colour Contrast Checker

  1. Open the tool. Open Colour Contrast Checker. There is nothing to upload — it works from the settings alone.
  2. Choose your settings. Adjust text colour, background colour, font size and the other 1 settings to suit what you need.
  3. Generate. Press Generate. The result appears immediately and updates whenever you change a setting.
  4. Save the result. Copy the output, or press Download to save it. Nothing is kept once you close the tab.

Frequently asked questions

Are my files uploaded when I use Colour Contrast Checker?

No. Colour Contrast Checker runs entirely inside your browser. Your file is read locally, processed on your own device, and handed straight back to you. You can confirm this yourself: open your browser's developer tools, watch the Network tab, and run the tool — no request carries your data anywhere.

Is Colour Contrast Checker free?

Yes, completely. No account, no sign-up, no watermark on your output, and no cap on how many times you can use it. The project is open source under the AGPL licence.

Does Colour Contrast Checker work offline?

Mostly. The site caches itself after your first visit, so it keeps working without a connection. Tools that need a specialised library — PDF editing, OCR, QR codes, MP3 encoding — need a connection the first time you run them, then that library is cached too.

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