Check color contrast for accessibility compliance.
Verify that your color combinations meet WCAG accessibility standards for normal and large text.
How to Use Contrast Checker
- Select or drag and drop your file(s) into the Contrast Checker workspace.
- Adjust the custom parameters, formats, or options to your requirements.
- Preview the processed output in real time and download the result instantly to your device.
Key Capabilities & Features
- 100% Client-Side Processing: Your data never leaves your computer or mobile device.
- Fast & Instant: Powered by modern WebAssembly and HTML5 browser APIs without upload delays.
- No Signups & No Watermarks: Completely free and unlimited for personal and professional use.
Privacy & Security Guarantee
At Toolbo, privacy is built directly into the software architecture. Contrast Checker processes all inputs directly in client-side browser memory. There is no server upload, no remote file caching, and zero tracking of your document or media contents.
Frequently Asked Questions
- What contrast ratios are required for WCAG 2.1 compliance?
- WCAG AA requires a minimum ratio of 4.5:1 for normal text and 3:1 for large text. WCAG AAA requires 7:1 for normal text and 4.5:1 for large text.
- Does this tool support both light and dark background evaluations?
- Yes, you can swap text and background colors or test live previews in real time.
Related Online Tools
- Color Palette Extractor — Extract dominant colors from any image.
- Color Palette Generator — Generate harmonious color palettes using color theory.
- Color Blindness Simulator — See how images look to people with color vision deficiencies.