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对比度检查器

检查前景色和背景色的对比度，确保无障碍可读性。

Features

  • Instantly calculate WCAG color contrast ratios to ensure your digital designs meet strict accessibility standards.
  • Supports multiple WCAG compliance levels, including AA and AAA, for both normal and large text sizes.
  • Easily pick colors directly from an integrated color picker or paste specific HEX and RGB values for quick testing.
  • Preview how your text and background color combinations look in real-time with a live visual preview window.
  • Copy and share your accessibility test results effortlessly to collaborate with your design and development team.

How to Use

  1. Enter or paste your foreground (text) color HEX code into the designated input box, or use the color picker tool.
  2. Input your background color HEX code using the second input box or color picker.
  3. Review the automatically generated contrast ratio score to see if your color combination passes or fails.
  4. Check the WCAG compliance grid to verify if your colors meet AA or AAA standards for normal and large text.
  5. Adjust your colors as needed until the tool indicates a passing grade for full accessibility compliance.

Frequently Asked Questions

What is a good color contrast ratio for accessibility?

For standard text to be WCAG AA compliant, a contrast ratio of at least 4.5:1 is required. For large text, a ratio of 3:1 is generally considered acceptable.

What is the difference between WCAG AA and AAA contrast levels?

WCAG AA requires a contrast ratio of 4.5:1 for normal text, while the stricter AAA level requires a ratio of 7.0:1. AAA compliance is highly recommended for optimal readability but is not mandatory for basic legal compliance.

Can I use this tool to check contrast for both web and mobile apps?

Yes, the WCAG color contrast guidelines apply universally across digital platforms, making this tool perfectly suited for designing accessible websites, iOS apps, and Android applications.

How do I find the HEX code of a color on my screen?

You can use native OS color pickers, browser extensions, or design software like Photoshop and Figma to extract the exact HEX code of any pixel on your screen before pasting it into the tool.

Does color contrast affect SEO?

While color contrast is not a direct Google search ranking factor, it drastically improves user experience, reduces bounce rates, and is a core component of overall web accessibility, which positively impacts SEO performance.