KitVela

Color Converter & WCAG Accessibility Contrast Checker

Convert HEX to RGB and audit WCAG accessibility contrast.

Convert color codes between HEX and RGB formats while testing accessibility compliance. Evaluate color contrast ratios against WCAG 2.1 AA and AAA standards with interactive previews.
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Color Converter & Contrast Checker

Test color combinations against WCAG 2.1 accessibility guidelines and convert HEX to RGB.

RGB: rgb(59, 130, 246)
RGB: rgb(255, 255, 255)
Contrast Ratio: 3.68 : 1

This live preview demonstrates how regular paragraph text and heading elements appear with your selected color pairing.

WCAG AA Large (3.0+)
Passes (18pt+ text)
WCAG AA Normal (4.5+)
Fails
WCAG AAA (7.0+)
Fails
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How It Works & Calculation Method

Digital accessibility compliance (WCAG 2.1) mandates minimum contrast ratios between foreground text and background colors to ensure readability for visually impaired users and outdoor mobile viewing.

Our Color Converter translates hexadecimal hex codes into RGB values and evaluates relative luminance to output pass/fail scores for standard body text and large typography.

The tool extracts hexadecimal red, green, and blue components into 8-bit integers (0-255).

It calculates relative luminance using sRGB gamma correction, and computes the contrast ratio as (L1 + 0.05) / (L2 + 0.05).

Mathematical Formula

Contrast Ratio = (Lighter Luminance + 0.05) / (Darker Luminance + 0.05)

Worked Example: Black Text (#000000) on White (#FFFFFF)

Evaluating baseline high-contrast typography.

•Luminance of pure white (#FFFFFF) = 1.0.
•Luminance of pure black (#000000) = 0.0.
•Contrast calculation = (1.0 + 0.05) / (0.0 + 0.05) = 1.05 / 0.05 = 21.0.
•Resulting ratio = 21.0:1 (Exceeds all WCAG AAA requirements).
Final Result: Contrast: 21:1 (Passes WCAG AAA for all text sizes)

Common Pitfalls to Avoid

  • •Using light grey text (#999999) on white backgrounds that fails basic WCAG AA thresholds.
  • •Assuming high contrast on desktop displays guarantees readability on low-brightness mobile screens.
  • •Neglecting that large text (18pt+) has lower contrast thresholds (3:1) than body text (4.5:1).

Who This Tool Is For

  • •UI/UX designers creating accessible design systems and component color palettes.
  • •Frontend developers auditing web apps for ADA and Section 508 legal compliance.
  • •Digital marketers ensuring email newsletters and banners remain readable.

How to Use the Color Converter

1

Select Colors

Pick foreground text color and background color.

2

Inspect RGB Values

View exact RGB numerical coordinates.

3

Audit WCAG Scores

Review pass/fail status for AA and AAA accessibility compliance.

Frequently Asked Questions

What is the minimum WCAG contrast ratio for normal text?
WCAG 2.1 Level AA requires a minimum contrast ratio of 4.5:1 for normal body text (under 18pt or under 14pt bold).
What is the contrast requirement for large text?
WCAG Level AA requires a minimum contrast ratio of 3.0:1 for large text (18pt+ or 14pt+ bold).
What is WCAG Level AAA contrast?
Level AAA requires an enhanced contrast ratio of 7.0:1 for normal text and 4.5:1 for large text.
How do you convert HEX to RGB?
HEX colors represent red, green, and blue in pairs of two hexadecimal digits (0-F); converting each hex pair to base-10 gives the RGB value.
Why is relative luminance important in contrast?
Human vision perceives green as brighter than red or blue; relative luminance weights color channels to match human biological perception.
Does contrast compliance affect SEO?
Yes, search engines like Google factor Core Web Vitals and accessible design usability into mobile ranking algorithms.

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Last updated: 10/9/2026