WCAG Color Converter & Contrast Checker

Convert colors between HEX, RGB, HSL formats and check accessibility contrast in real time under the standards of WCAG 2.1 guidelines (AA and AAA).

Configuration & Input

Text RGB rgb(0, 0, 0)
Background RGB rgb(255, 255, 255)

Processed Results

WCAG 2.1 Contrast Ratio
21.00:1
Normal Text (AA / AAA)
AA (req. 4.5:1) / AAA (req. 7.0:1)
AA: PASS AAA: PASS
Large Text (AA / AAA)
AA (req. 3.0:1) / AAA (req. 4.5:1)
AA: PASS AAA: PASS
Vista Previa de Componentes

Texto Grande de Muestra

Este es un párrafo de texto normal que demuestra la legibilidad con la combinación actual de colores de primer plano y fondo.

User Guide: Color Contrast & Web Accessibility (WCAG 2.1)

Web accessibility ensures that all users, including individuals with color blindness, visual impairments, or aging eyes, can consume online content effectively. One of the core pillars of readable design is the **contrast ratio** between textual information (foreground) and its background container.

The W3C consortium establishes the **Web Content Accessibility Guidelines (WCAG 2.1)**, laying down strict mathematical formulas based on relative luminance to calculate readability contrast. Contrast scores range from **1:1** (zero contrast, e.g., white on white) up to **21:1** (maximum possible contrast, e.g., black on white).

WCAG Contrast Requirements
  • Normal Text (Under 18pt or 14pt bold / approx. 24px):
    • Level AA (Standard): Requires a minimum contrast ratio of 4.5:1.
    • Level AAA (Enhanced): Requires a minimum contrast ratio of 7.0:1.
  • Large Text (18pt or 14pt bold and above / approx. 24px):
    • Level AA (Standard): Requires a minimum contrast ratio of 3.0:1.
    • Level AAA (Enhanced): Requires a minimum contrast ratio of 4.5:1.
How to use this Contrast Evaluation Tool
  1. Set the **Text Color** via hex codes (e.g., `#000000`) or select it using the native system color picker.
  2. Set the **Background Color** (e.g., `#FFFFFF`).
  3. Observe the real-time contrast calculations on the right pane to instantly confirm compliance with standard **AA** and premium **AAA** scales.
  4. Inspect the **Component Preview Panel** to evaluate how normal prose, large headers, and mock interaction buttons render under the loaded color pair.
Data Privacy & Security Guaranteed
100% Offline Processing: We keep your design assets safe. All color parsing, HEX-to-RGB, RGB-to-HSL math, and relative luminance calculations run entirely client-side inside your browser sandbox. No telemetry or styling data is sent over the network, providing absolute privacy.