WCAG Color Contrast Checker
Check WCAG 2.1 AA and AAA color contrast ratio between text and background. Live accessibility testing tool.
Características Principales y Garantía de Privacidad
- ✓ Ejecución 100% en el Navegador: Tus datos nunca salen de tu dispositivo ni tocan servidores remotos.
- ✓ Salida Instantánea en Tiempo Real: Cero latencia de red, evaluación al teclear y copiado rápido.
- ✓ Gratis e Ilimitado para Siempre: Sin registro, sin barreras de pago ni límites diarios.
- ✓ Cumplimiento de Estándares: Desarrollado según especificaciones web RFC, ISO y W3C.
Test text and background color accessibility contrast
Verify that your website color palette complies with WCAG 2.1 AA and AAA accessibility standards. Get exact contrast ratios and pass/fail indicators for normal and large text.
Especificaciones Técnicas y Arquitectura
- Execution Environment:
- 100% Client-Side Browser Sandbox
- Data Privacy:
- Zero Server Storage / No Tracking
- Processing Speed:
- Real-time local CPU execution
- Cross-Platform:
- Works on Windows, macOS, Linux, iOS & Android
Local Processing for CSS Tools
This tool runs within your browser sandbox using modern Web APIs. Inputs are processed on your local device CPU, avoiding network latency and ensuring your data is never stored on external servers or accessible to third parties.
Provide Input
Enter, paste, or upload your data into the input field above.
Configure & Process
The tool immediately processes your input in real time according to your chosen settings.
Copy or Save
Use the Copy button to copy the output to your clipboard, or download the result to your device.
Casos de Uso Comunes
- Audit UI color schemes for Web Accessibility (WCAG 2.1)
- Ensure button labels and body text remain readable for vision-impaired users
- Select accessible dark mode and high-contrast theme palettes
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Preguntas frecuentes
- What is the minimum WCAG contrast ratio for normal text?
- WCAG 2.1 Level AA requires a contrast ratio of at least 4.5:1 for normal text (under 18pt / 24px) and 3.0:1 for large text.
- What ratio is required for Level AAA compliance?
- Level AAA requires a contrast ratio of 7.0:1 for normal text and 4.5:1 for large text.
- How is contrast ratio calculated?
- The contrast ratio is calculated using relative luminance values (L1 + 0.05) / (L2 + 0.05) as defined by the W3C WCAG specification.