WCAG Color Contrast Checker
Check WCAG 2.1 AA and AAA color contrast ratio between text and background. Live accessibility testing tool.
Ключевые особенности и гарантия конфиденциальности
- ✓ 100% выполнение в браузере: Ваши данные никогда не покидают устройство и не отправляются на удалённые серверы.
- ✓ Мгновенный результат в реальном времени: Нулевая сетевая задержка, пересчёт при вводе и быстрое копирование.
- ✓ Бесплатно и без ограничений навсегда: Без регистрации, без платных тарифов и без дневных лимитов.
- ✓ Соответствие стандартам: Разработано строго по стандартам RFC, ISO и спецификациям 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.
Технические характеристики и архитектура
- 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.
Популярные сценарии использования
- 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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Часто задаваемые вопросы
- 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.