Colour Contrast Checker

Preview foreground and background combinations live, review pass or fail states for normal and large text, and copy suggested colours that meet WCAG thresholds.

contrast checker colour check wcag ratios

Runs in your browser

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Mini tour

How to use Colour Contrast Checker

1. Step

Paste or load the contrast input you want to work with.

2. Step

Configure the few options that matter for your current debugging task.

3. Step

Review the result, then copy, share, or continue iterating in the browser.

Foreground colour

Background colour

Sample text Aa

Body text preview. The quick brown fox jumps over the lazy dog and shows the real readability of this colour pairing.

Contrast ratio

14.63:1

AA Normal PassAAA Normal PassAA Large PassAAA Large PassUI Component Pass

Colour blindness simulation

Deuteranopia

Sample text

Protanopia

Sample text

Tritanopia

Sample text

Bulk checker

#111827:#FFFFFF17.74:1 AA pass

#777777:#FFFFFF4.48:1 AA fail

About This Tool

Colour Contrast Checker is a browser-based colour contrast checker built for developers, QA engineers, and DevOps teams who need quick results during debugging and release work.

It helps reduce context switching during accessibility tools workflows by keeping formatting, validation, comparison, or conversion tasks inside a single lightweight browser experience.

How to Use the Colour Contrast Checker

1. Enter or pick the foreground and background colours.
2. Review the live preview and the main contrast ratio result.
3. Check the AA, AAA, large-text, and UI component badges to confirm compliance.

When to Use This Tool

Colour Contrast Checker is useful when you need a fast browser-based step inside an API, QA, or DevOps workflow without switching to a local script or desktop utility.

Teams typically use this accessibility tools workflow during payload debugging, CI checks, incident triage, configuration review, and regression validation.

Frequently Asked Questions

Is Colour Contrast Checker free?: Yes. It is free to use with no login, no registration, and no rate limits for normal browser workflows.
Is my data safe when using Colour Contrast Checker?: Yes. The workflow is designed to run in the browser so your input does not need to be sent to a server for processing.
Who should use this colour contrast checker?: This tool is useful for developers, QA engineers, SDETs, and DevOps teams who need quick, repeatable checks during debugging and release validation.
Does Colour Contrast Checker work in the browser?: Colour Contrast Checker is designed for browser-based workflows so teams can inspect data quickly without installing a separate desktop tool.
When should I use this colour contrast checker?: Use it when you need a fast validation, formatting, conversion, or debugging step before moving into deeper automation or release checks.

About

Check WCAG 2.1 contrast ratios for text and UI colours, preview the pairing live, and get suggested colours that pass AA when the current pair fails.

Accepted input

Accepts foreground and background colours in HEX format, plus optional bulk fg:bg pairs for batch checking.

How to use

Enter or pick the foreground and background colours.
Review the live preview and the main contrast ratio result.
Check the AA, AAA, large-text, and UI component badges to confirm compliance.
Copy one of the suggested replacement colours if the current pair fails.

Tips

Normal text needs 4.5:1 for WCAG AA, while large text only needs 3:1.
The UI component badge is useful for icons, borders, and control outlines, not just text.

Outils liés

Colour Format Converter Meta Tag Previewer Accessibility Checker

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About This Tool

Colour Contrast Checker is a browser-based colour contrast checker built for developers, QA engineers, and DevOps teams who need quick results during debugging and release work.

It helps reduce context switching during accessibility tools workflows by keeping formatting, validation, comparison, or conversion tasks inside a single lightweight browser experience.

How to Use the Colour Contrast Checker

1. Enter or pick the foreground and background colours.
2. Review the live preview and the main contrast ratio result.
3. Check the AA, AAA, large-text, and UI component badges to confirm compliance.

When to Use This Tool

Colour Contrast Checker is useful when you need a fast browser-based step inside an API, QA, or DevOps workflow without switching to a local script or desktop utility.

Teams typically use this accessibility tools workflow during payload debugging, CI checks, incident triage, configuration review, and regression validation.

Frequently Asked Questions

Is Colour Contrast Checker free?: Yes. It is free to use with no login, no registration, and no rate limits for normal browser workflows.
Is my data safe when using Colour Contrast Checker?: Yes. The workflow is designed to run in the browser so your input does not need to be sent to a server for processing.
Who should use this colour contrast checker?: This tool is useful for developers, QA engineers, SDETs, and DevOps teams who need quick, repeatable checks during debugging and release validation.
Does Colour Contrast Checker work in the browser?: Colour Contrast Checker is designed for browser-based workflows so teams can inspect data quickly without installing a separate desktop tool.
When should I use this colour contrast checker?: Use it when you need a fast validation, formatting, conversion, or debugging step before moving into deeper automation or release checks.