Color Contrast Checker (WCAG)
Calculates contrast ratios between two colors according to WCAG 2.1 guidelines (AA/AAA).
Color Contrast Checker (WCAG 2.1)
WCAG 2.1 Accessibility
Preview
This is an example of normal body text. Readability strongly depends on the contrast ratio between foreground and background color.
Example application
The preview above shows the exact colors. Use a contrast ratio of **4.5:1** for body text (AA) and **3:1** for large text to ensure good accessibility.
WCAG 2.2 / APCA-Light
APCA-Light: Lc 62Normal text should reach at least a 4.5:1 ratio.
Lc 62
Palette suggestions
Guide & best practices
Color Contrast Checker (WCAG) online tool
Calculates contrast ratios between two colors according to WCAG 2.1 guidelines (AA/AAA).
Typical use cases
Color Contrast Checker (WCAG) supports recurring developer, security and SEO tasks directly in the browser. The tool focuses on fast results, clear output and safe defaults.
How it works
Enter the relevant input, run the analysis or transformation and review the structured output. Where useful, Balou Tools adds hints, exports and related tools for the next step.
Best practices
Always review results in context, avoid sensitive production data in online inputs and use export/copy actions for traceable documentation.
Frequently asked questions
What is Color Contrast Checker (WCAG) useful for?
Color Contrast Checker (WCAG) is useful for fast technical checks and recurring development tasks without local installation.
Are my inputs stored?
Many tools run locally in the browser; server-side diagnostics query the specified target from the Balou backend. AI features are only used after an explicit user action.
Can I share the result?
Many diagnostic tools support export, Markdown, JSON or share links. Local utility tools provide at least copy-to-clipboard output.