Color Contrast Checker

Check color contrast between the text and its background and make your web content easy to read!

Powered by and
Register and subscribe now to get instant access to the full range of application features!
Subscribe to paid Aspose services
Large font text example.
Normal font text example.
Normal bold font text example.
Large text:
Normal text:
Bold text:
UI Elements:
Contrast Ratio:
21.00 Excellent

Foreground color


Background color

By uploading your files or using our service you agree with our Terms of Service and Privacy Policy

Aspose.HTMLAspose.HTML Web Applications

Check color contrast easily!

Color Contrast Checker is a free online application to find optimal color contrast for the user interface elements. This tool follows the Web Content Accessibility Guidelines (WCAG), which are a series of recommendations for making web content more accessible. The Color Contrast Checker works on any platform, any device with a browser. You can run it for computers, tablets and mobile devices. There are no limits to taking the application, so feel free and use it as much as you need! Easily apply this tool to check color contrast and make your design available for anybody.

Color Contrast Ratio

Color contrast ratio is a numerical measure of the difference in perceived brightness or brightness between two colors. It is commonly used in web design and accessibility to ensure that text and other content are readable against their background. WCAG determines two levels of contrast ratios depending on the level of success criteria: AA (minimum contrast) and AAA (enhanced contrast). Contrast ratios can range from 1 to 21.
- The levelAArequires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text (at least 18pt) or bold text.
- The level AAA requires a ratio of at least 7:1 for normal text and 4.5:1 for large text or bold text.

Since color is essential both for visual perception and for conveying meaning, it is imperative that all users be able to take content on a web page in different tones and paints. Color accessibility is required as it helps users, including people with visual impairments, correctly distinguish between content elements and read them effectively. A color contrast directly affects a person's susceptibility to web content.

The color contrast ratio is an essential aspect of text accessibility for everybody. Therefore, it is vital to give all users convenient, friendly, and accessible web content. You can check color contrast on the fly using our Color Contrast Checker!
  • Fast and easy way to check contrast for your site's design
  • Multiple ways to choose colors: manually or using the color picker tool
  • Compliance indicators for Web Content Accessibility Guidelines (WCAG)
  • No limits, no registration and software installation
  • Works from your favorite device

How to Check Color Contrast

  • Enter either the background and foreground colors in HEX format, or select them using the color picker. After choosing a color, you may adjust the lightness.
  • On the preview panel at the left, you will see how the selected color pair will appear for large, normal, bold text and UI elements.
  • The panel at the left and below shows if the selected color pair matches WCAG contrast requirements.


  • Why is Color Contrast Checker important?Color contrast is a significant component in website design. For easy reading, the contrast between the text and its background should be high. Our Color Contrast Checker is a free online tool that allows you to calculate and check contrast levels for text and its background on your website for accessibility. Providing a “Good“ or “Excellent“ ratio can make it easier for visually impaired users to read and interact with your website content.
  • How is a color contrast ratio calculated?Color Contrast Checker uses the WCAG formulas for the calculation of color contrast ratio. It estimates the difference in perceived brightness between two colors to make sure it is visible to users. The difference is measured on a ratio scale that starts at 1:1 (for white on white), up to 21:1 (for black on white).
  • What are criteria for a good contrast ratio of web page elements?According to WCAG that is the world's authority on web accessibility, AA level, the minimum contrast ratio that colors can have for visual presentation text and images text - 4.5:1. For level AAA compliance the text must have a contrast ratio of 7:1. But, if your text is large (18+ point or 14 points if the text is bold), then your ratio can be 3:1 for AA compliance and 4.5:1 for AAA.
  • Can I check contrast ratio on Linux, Mac OS or Android?Yes, you can use this free application on any operating system that has a web browser. It works online and does not require any additional software installation.
  • Fast and Easy Contrast Checker

    First, select the foreground and background colors.The contrast value will be shown immediately and told if the selected colors pass WCAG contrast requirements or not.
  • Check Contrast Ratio from Anywhere

    It works from all platforms including Windows, Linux, Mac OS, Android and iOS. All files are processed on our servers. No plugin or software installation required for you.
  • Color Contrast Checker Quality

    All data are processed using Aspose APIs, which are established well in the software industry and used by many Fortune 100 companies across 114 countries.
© Aspose Pty Ltd 2001-2024. All Rights Reserved.