SEO Groww
Meta Tags
Open Graph GeneratorTwitter Card GeneratorMeta Description GeneratorJSON-LD Generator
Audit & Check
SEO CheckerOn-Page SEO AuditReadability CheckerSite CrawlerBulk SEO Checker
Keywords & SERP
Keyword Density CheckerSERP Snippet Preview
Technical SEO
Canonical Tag GeneratorRobots.txt GeneratorXML Sitemap GeneratorHreflang GeneratorRedirect Generatorllms.txt Generator
AI Tools
AI SEO FixerSERP Competitor AnalysisCTR Score CheckerAI Keyword ResearchAI Content BriefAI Search Visibility
Accessibility
WCAG Contrast CheckerTarget Size CheckerFocus Appearance CheckerWCAG 2.2 Checklist
Ad Tech
GPT Lazy Load Generator
ContactOpen the studio

#171717 on #ffffff contrast ratio

17.92:1

Very dark grey (Tailwind neutral-900) text (#171717) on a white background (#ffffff) meets WCAG 2.2 level AAA for normal text.

Swap: #ffffff on #171717

Large text sample

Normal body text in #171717 on #ffffff. The quick brown fox jumps over the lazy dog.

WCAG 2.2 results

WCAG 2.2 contrast results for #171717 on #ffffff
Normal text — WCAG 1.4.3 AA4.5:1Pass
Large text — WCAG 1.4.3 AA3:1Pass
UI components & icons — WCAG 1.4.11 AA3:1Pass
Normal text — WCAG 1.4.6 AAA7:1Pass
Large text — WCAG 1.4.6 AAA4.5:1Pass

Nearest passing colours

This pair already meets AAA. Nothing to fix.

How it looks with colour blindness

Simulated with the Machado et al. (2009) model at full severity.

  • Aa

    Protanopia (no red cones)

    17.92:1

  • Aa

    Deuteranopia (no green cones)

    17.92:1

  • Aa

    Tritanopia (no blue cones)

    17.92:1

  • Aa

    Achromatopsia (no colour)

    17.92:1

Try a different pair

Colours

Hex, rgb() or hsl(). Alpha is composited.

Permalink

Preview

Large heading text

Normal body text at 14 px. The quick brown fox jumps over the lazy dog.

Outlined buttonA text link

Colour-blindness preview

Simulated with Machado et al. (2009), full severity.

  • AaProtanopia (no red cones)17.92:1
  • AaDeuteranopia (no green cones)17.92:1
  • AaTritanopia (no blue cones)17.92:1
  • AaAchromatopsia (no colour)17.92:1

Contrast ratio

17.92:1

WCAG 2.2 contrast verdicts
CheckCriterionNeedsResult
Normal text1.4.3 AA4.5:1Pass
Large text1.4.3 AA3:1Pass
UI components & graphics1.4.11 AA3:1Pass
Normal text1.4.6 AAA7:1Pass
Large text1.4.6 AAA4.5:1Pass

Nearest passing colours

Same hue, lightness adjusted in OKLCH.

AA — 4.5:1

Already passes.

AAA — 7:1

Already passes.

Large text means at least 24 CSS px, or 18.66 CSS px bold. Ratios are truncated, never rounded, so 4.49:1 is shown as failing 4.5:1.

Questions about this pair

Is #171717 on #ffffff accessible?
Yes for WCAG 2.2 level AA: the contrast ratio is 17.92:1, above the 4.5:1 needed for normal text. It also meets AAA (7:1).
What is the contrast ratio of #171717 and #ffffff?
17.92:1, calculated with the WCAG 2.2 relative luminance formula. The ratio is truncated, not rounded, so it never shows a failing pair as passing.

Related colour pairs