Contrast Checker

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Contrast Checker

Check text and background contrast against WCAG guidance.

Colour & Design workspaceLive previews and browser-only processing.
Readable sample heading

This is a preview of regular body text on your chosen background.

WCAG contrast guidance covers colour contrast only; it is not a full accessibility audit.

Privacy-focused processingBrowser processing is used wherever practical.
25-minute cleanup policyServer files, when required, are removed after completion—not during active work.
Text, pasted data or supported local filesMaximum size and exact support are shown inside the tool.

About This Tool

Compare opaque foreground and background colours using WCAG contrast-ratio thresholds.

How to Use

  1. Choose the text and background colours.
  2. Review the ratio and live preview.
  3. Check normal/large text guidance and copy CSS.

Tool Features

  • Live text preview
  • WCAG AA and AAA thresholds
  • Editable colours
  • CSS export

Common Use Cases

Everyday work

Complete repetitive formatting or calculation tasks.

Publishing

Prepare clean output for websites and documents.

Local review

Inspect and verify your result before downloading.

Supported Input and Output

Text, pasted data or supported local files

  • Check the tool workspace for its exact file-size limit.
  • Browser format support can vary by device and browser version.
  • Always review the generated result before important use.

Frequently Asked Questions

Does passing contrast guarantee accessibility?

No. Contrast is only one part of accessible design.

Security and Privacy Information

Local first

Supported processing runs inside your browser whenever practical.

Temporary files

When server processing is required, cleanup starts only after the work completes.

Your responsibility

Avoid uploading confidential data unless you understand the displayed processing notice.

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