Brand green on white
#0f7b63 on #ffffff
Contrast ratio plus AA and AAA pass/fail guidance.
Frontend Tools
Contrast Checker
Compare foreground and background colors locally and review WCAG contrast guidance.
Processed locally · Your input stays in your browser
ByteBench contrast sample
Readable UI text should stay comfortable on both desktop and mobile screens.
bytebench / contrast-checkerLocal
Tool output
Ready when you are.
Loading browser tool.
How to use this tool
This contrast checker measures the contrast ratio between two colors locally in your browser and explains whether the pair meets common WCAG text thresholds. It is useful for UI review, design systems, and accessibility checks.
- Paste or type your input into the tool area.
- Choose the mode or options that match your task.
- Review validation messages before copying the output.
- Use the example button when you want a known-good starting point.
Examples
Common use cases
- Check body text contrast.
- Review button label readability.
- Compare color token pairs before shipping UI changes.
When to use this tool
Use this contrast checker page when you need to check color contrast quickly during debugging, review, migration, or documentation work and want to keep raw input in your browser session.
If your task shifts, Color Picker and CSS Minifier are usually the next useful tools.
Input and output expectations
- Expected input shape: Paste UI-oriented values such as HEX colors, snippets, or small frontend samples.
- Typical output: Readable frontend values and checks you can move into styles, design docs, or review comments.
- Quick input example: #0f7b63 on #ffffff
- Quick output example: Contrast ratio plus AA and AAA pass/fail guidance.
Common mistakes to avoid
- Choosing colors without checking contrast for text readability.
- Assuming one format is enough across all frontend systems.
- Skipping final visual checks in the actual UI context.
Notes and edge cases
The checker is best for text contrast review. Non-text UI requirements can differ, so still review components in context.
For privacy-sensitive data, keep using the tool in a trusted browser session and avoid pasting secrets into shared screens, screenshots, browser extensions, or remote support sessions.
FAQ
Does this contrast checker upload my input?
No. This contrast checker runs in your browser and does not send your input to ByteBench servers.
What input format works best in this contrast checker?
Use clean foreground and background color pairs input and run the example first when you want a known-good baseline. If your pasted data came from logs or docs, remove accidental wrappers before validating or converting.
How should I validate results from this contrast checker?
Review the status message, compare output with expected behavior, and run one quick edge-case check. ByteBench helps with utility work, but production-critical output should still be verified in your project pipeline.