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Check Contrast Pro

Check text-to-background contrast for WCAG compliance. Pro plan required.

Secure processing
Files deleted after 1 hour

How to Check Contrast

1

Upload your PDF

2

Contrast ratios are analyzed

3

View the WCAG compliance report

Frequently Asked Questions

1What contrast ratio is required?

WCAG AA requires 4.5:1 for normal text and 3:1 for large text.

2What is WCAG AAA?

WCAG AAA is the highest accessibility level, requiring 7:1 for normal text and 4.5:1 for large text. AA is the minimum standard.

3Does low contrast affect all users?

Yes. Low contrast text is harder to read for everyone, especially users with low vision, color blindness, or in bright lighting conditions.

4How do I fix contrast issues?

Increase the difference between text and background colors. The report shows exact ratios and suggests minimum color adjustments for compliance.

Why Use ZiaSign's Check Contrast Tool?

ZiaSign's contrast checker analyzes text-to-background color contrast ratios throughout your PDF. Verify WCAG AA and AAA compliance. Identify low-contrast text that may be difficult to read for users with low vision.

Check WCAG AA and AAA contrast ratios
Identify low-contrast text elements
Per-page contrast analysis
Essential for accessibility compliance

Also known as: pdf contrast check · wcag contrast ratio · pdf accessibility contrast · text contrast checker

Switching from another platform?

See how ZiaSign compares on pricing, limits, and contract workflows before you commit.

ZiaSign vs DocuSign

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ZiaSign vs Adobe Sign

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ZiaSign vs PandaDoc

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ZiaSign vs Smallpdf

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ZiaSign vs iLovePDF

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ZiaSign vs PDF24

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ZiaSign vs Sejda

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Popular Ways to Use Check Contrast

Jump straight to the query-specific guide that matches what you are trying to do, then open the tool when you are ready.

Check PDF Color Contrast for Readability

Verify text-to-background contrast ratios meet WCAG accessibility standards

Open guide
Browse all 139 use-case guides

Why teams stay with ZiaSign after the first PDF fix

The strongest tool pages do not just solve one file problem. They make the next contract easier to prepare, route, sign, track, and trust.

Secure file handling by default

Files are processed securely and automatically deleted after 1 hour, so quick PDF jobs do not turn into unmanaged storage risk.

A practical next step when the file is ready

Start with one file task, then use the workspace, e-signature flow, or one of 139 guides when your document needs another step.

Clear access boundaries as work grows

Anonymous tools cover quick fixes. A free account adds workspace continuity, while Basic, Pro, and Max add capacity or advanced PDF tooling.

Related PDF Tools

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View all 118 tools

40

No-signup PDF tools

33

More with a free account

118

PDF tools on Pro

1 hour

Job-result retention

Quick PDF tools, workspace continuity, e-signature workflows, and plan-based PDF capacity in one platform.

Need the full PDF tool catalogue?

Pro unlocks all 118 PDF tools. Max includes the same tools with five times Pro's operating capacity for batch and multi-file work.

Compare Pro and MaxBrowse 139 Use-Case Guides

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