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Contrast Checker

Color

Check text and background contrast for WCAG AA and AAA accessibility compliance.

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Sample TextThe quick brown fox jumps over the lazy dog.
Contrast Ratio
21.00:1
WCAG Level
AAA
Excellent contrast for all text sizes

How to use the Contrast Checker

Open Contrast Checker, enter any color value, and get instant format conversions. The tool runs in your browser, so you can experiment freely without worrying about data leaving your machine.

Why use the Contrast Checker

With Contrast Checker, you get a complete color toolkit in your browser. Pick, convert, and generate palettes without uploading anything or installing software.

When to use Contrast Checker

Open Contrast Checker when experimenting with colour schemes during the design phase. Pick a base colour, explore its RGB and HSL equivalents, and build a mental model of how channel adjustments affect the perceived hue — all without leaving your browser or installing a design tool.

Key features of Contrast Checker

Contrast Checker eliminates the need for multiple colour tools by combining a picker, converter, contrast checker, and palette generator in one browser-based interface. Every conversion is local, so you can explore colour schemes without uploading anything.

Common use cases for Contrast Checker

Typical scenarios: a UI developer experiments with colour variations by adjusting HSL sliders and copying the resulting HEX values directly into component styles; an accessibility auditor tests multiple colour combinations against contrast ratio guidelines in one session; and a student learns how different colour models represent the same hue differently.

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Related reading

Quick answers for Contrast Checker

What does the Contrast Checker do?
Check text and background contrast for WCAG AA and AAA accessibility compliance. The Contrast Checker is one of 900+ free developer tools on Toolblip - all open to use without a signup.
How do I use the Contrast Checker?
Open the Contrast Checker on this page, paste or upload your input, and the result updates as you type. Use the copy button to grab the output, or adjust options to tune the result. Nothing you enter leaves your browser.
Is the Contrast Checker free to use?
Yes. The Contrast Checker is a free online tool on Toolblip - no signup, no account, no hidden usage limits. It runs in your browser and works on desktop and mobile.
Is the Contrast Checker safe and private?
Yes. The Contrast Checker processes your data entirely client-side, so nothing you paste is uploaded or stored on any server. It's safe to use with internal snippets, private keys for debugging, or any other sensitive content you'd rather not send to a remote service.
What kind of output does the Contrast Checker produce?
The Contrast Checker produces clean, formatted output that you can copy or download with a single click. The output is tailored to the tool's purpose — formatted code, converted data, transformed text, or processed media — and is ready for immediate use in your project or workflow.
Does the Contrast Checker work on mobile devices?
Yes. The Contrast Checker is designed to work on any device with a modern browser, including phones and tablets. The interface adapts to smaller screens, and the core functionality — paste input, transform, copy output — works the same way regardless of your device.
What color formats does the Contrast Checker support?
The Contrast Checker works with the formats web developers reach for every day - HEX, RGB / RGBA, and HSL. You can copy any value with one click for use in CSS, design tools, or code.
Can I pick a colour visually with the Contrast Checker, or do I need to type values?
The Contrast Checker supports both approaches. You can type colour values directly in any format (HEX, RGB, HSL), or click the colour swatch to open your system's native colour picker for visual selection. The tool converts between formats regardless of which input method you use.
Can I use the Contrast Checker offline?
Once the page has loaded, the Contrast Checker continues to work without an internet connection. Bookmark this page and return to it anytime - all logic runs locally.