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Color Contrast Checker – Test Your Colors for WCAG
Use this free color contrast checker to see if your text is easy to read on its background. Pick two colors and get the contrast ratio. You also get a clear pass or fail for AA and AAA. It runs in your browser, so nothing is uploaded.
What Is Color Contrast?
Color contrast is the difference between two colors. On a web page, it is usually the difference between the text color and the background color.
- High contrast means the text is easy to read. Example: black text on a white background.
- Low contrast means the text is hard to read. Example: light gray text on a white background.
Why Does Contrast Matter?
Good contrast helps everyone read your page. It helps even more for:
- People with low vision
- People with color blindness
- Older readers
- Anyone using a phone in bright sunlight
Good contrast also makes your site look clean and professional. And many countries expect websites to follow accessibility rules, so it is a smart habit.
How to Use the Color Contrast Checker
- Choose your text color.
- Choose your background color.
- See the contrast ratio.
- Check the AA and AAA results.
- If the result fails, change one color and test again.
It takes less than a minute. No sign-up and no installation needed.
What Is a Contrast Ratio?
The contrast ratio is a number that shows how different two colors are. It goes from 1:1 to 21:1.
- 1:1 means the two colors are the same. You cannot read the text.
- 21:1 is the highest. Black on white gives 21:1.
A bigger number means better contrast.
What Do AA and AAA Mean?
AA and AAA are levels from WCAG. WCAG stands for Web Content Accessibility Guidelines. These are the world’s most common rules for accessible websites.
| Type of Content | AA (Good) | AAA (Best) |
|---|---|---|
| Normal text | 4.5:1 | 7:1 |
| Large text | 3:1 | 4.5:1 |
| Buttons, icons, and form borders | 3:1 | – |
What is large text? Text that is at least 24px (18pt) in size, or at least 18.66px (14pt) and bold.
For most websites, AA is the goal. AAA is even better, but it is not always possible for every color.
Why Use Our Color Contrast Checker?
- Free forever: No limits and no hidden charges.
- Clear results: You see the ratio and the AA and AAA verdicts together.
- Fast: You get the answer right away.
- 100% private: Everything runs in your browser. Nothing is uploaded.
- Works on all devices: Mobile, tablet, and desktop.
Easy Tips for Better Contrast
- Use dark text on a light background, or light text on a dark background.
- Do not use light gray text on white. It looks soft, but it is hard to read.
- Test your button colors, link colors, and placeholder text too.
- Do not use color alone to show meaning. For example, add an icon or text to an error message, not just red color.
- Test again after you change your brand colors.
Building a design? Our Box Shadow Generator and Border Radius Generator can help you style cards and buttons. For more simple guides, visit our blog, or explore all free tools on MeraTool.
Frequently Asked Questions (FAQ)
What is a color contrast checker?
It is a tool that tests how well two colors work together, usually text and background. It shows if your text is easy to read.
What is a good contrast ratio?
For normal text, 4.5:1 or higher is good. This is the AA level.
What is the contrast ratio for large text?
Large text needs at least 3:1 for AA, and 4.5:1 for AAA.
What is the difference between AA and AAA?
AA is the standard level that most websites should reach. AAA is a higher level with stricter rules.
What is WCAG?
WCAG means Web Content Accessibility Guidelines. It is a set of rules that helps make websites usable for everyone.
What is the best contrast ratio?
The highest possible ratio is 21:1, which is black on white. You do not need that much. AA or AAA is enough for most designs.
Does contrast matter for buttons and icons?
Yes. Buttons, icons, and form borders should have at least 3:1 contrast with the color next to them.
Is this color contrast checker free?
Yes. It is completely free, and you do not need an account.
Is my data safe?
Yes. The tool runs entirely in your browser. Nothing you enter is uploaded or stored on our servers.
Can I use it on my phone?
Yes. It works on all modern browsers on mobile and desktop.