contrastlab.Part of Lavmio ↗

Accessibility & design / Made for the task at hand

Good color.
Clearer reading.

Check contrast between two opaque HEX colors. See the exact WCAG threshold outcomes for normal and large text, with a live reading sample and CSV report.

Free to useNo account neededProcessed on your device

Your wcag color contrast checker workspace

02 / SOURCE
03 / RESULT

Contrast report

Ready when you are
A little less work starts here.

Add your source, or try the example, then choose “Check my colors”.

Results are temporary. Download anything you want to keep.

Your original data is never changed.
◇ Local processing↧ Real, downloadable results⌁ No account required

A practical little workflow

From “I need to…” to done.

01

Choose two solid colors

Enter #RGB or #RRGGBB foreground and background colors. Alpha channels, gradients and images are not supported.

02

Read the threshold results

Check AA and AAA for normal and large text. Pass/fail uses the unrounded ratio, even when the displayed number rounds up.

03

Test it in context

Review actual font size, weight, states and surrounding colors in your design. Export a small report for handoff.

Before you get started

Useful answers.
Clear boundaries.

Built for a focused job.
Review important results before use.

What counts as large text?

At least 24 CSS pixels for normal weight, or about 18.67 CSS pixels when bold. AA requires 4.5:1 for normal text and 3:1 for large text, subject to WCAG exceptions.

Does passing mean my site is accessible?

No. This checks only color contrast for solid pairs. Accessibility also includes semantics, keyboard use, focus, content and many other requirements.

What about transparent colors or photographs?

Composite transparency against its actual background first. Gradients and images may vary across the text; test the least favorable area separately.

What happens to my data?

Working text and local files are processed in this browser tab and are not sent to a server or an AI service. Reloading clears this workspace. Optional analytics and feedback have separate privacy controls; see Privacy below.

Your work stays yours.

Files and text are processed in this browser tab. The tool does not upload your working files or text. Feedback is optional: opening Feedback loads a Tally-hosted form, and submitted feedback is processed by Tally. The form is not attached to your working files. No advertising is installed. On our official lavmio.com websites, optional Google Analytics loads only after you allow it. It measures visits, approximate location, device/browser information, tool completion and download actions. Working files, text, filenames and form contents are not attached. Page query strings, fragments and referrer paths are excluded. We disable advertising features and automatic form/link tracking. Your preference is stored for six months across Lavmio websites; Google Analytics cookies also expire after six months. Use Analytics choices in the footer to change your choice or withdraw permission. Google processes measurement data; see how Google uses information from partner sites. Preview addresses do not run analytics.

Campaign presets are stored only when you choose Save. Other workspaces are cleared when reloaded. Like any website, the hosting server can receive ordinary page-request information, such as your IP address.

Downloads are saved to your device. Check results before using them in a production workflow.