All WCAG criteria
WCAG 1.4.1 · PerceivableLevel A

1.4.1Use of Color

Color cannot be the only visual means of conveying information, indicating action, prompting response, or distinguishing a visual element.

Common failures

Patterns that fail this criterion.

  • 01Form errors shown only in red text (no icon, no text label)
  • 02Required fields shown only with a red asterisk (no "required" label)
  • 03Chart data series distinguished by color only (no patterns, labels, shapes)
  • 04Links styled with color only (no underline or other distinguishing feature)
How to test

Testing approach: manual.

Manual — convert page to grayscale (browser dev-tools emulate-vision-deficiency or extensions); confirm meaning is still conveyed.

How to fix

Remediation steps.

  1. 1

    Add a non-color cue

    Icons, text labels, patterns, underlines, bold, italics — anything visual but not color.

  2. 2

    For errors

    Red + icon + descriptive text. "❌ Required field" not just red text.

  3. 3

    For charts

    Labels next to each series, or patterns/textures within bars, in addition to color.

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Related criteria

Often appears with…

WCAG 1.4.3 · Level AA

Contrast (Minimum)

WCAG 1.3.3 · Level A

Sensory Characteristics

All 50 WCAG 2.1 Level A + AA success criteria explained.

View the full checklist