Contrast ratio
WCAG contrast ranges from 1:1 (no contrast) to 21:1 (black on white).
Color Contrast Checker
Calculate the WCAG contrast ratio between a foreground and background color.
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● ● ●COLOR-CONTRAST-CHECKER_TOOL● LIVE
Run Color Contrast CheckerEnter your requirements below. We will calculate the result instantly and show the closest relevant HostGraber option when available.
RESULTYour result
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UNDERSTAND THE TOOL
What is Color Contrast Checker?
WCAG defines minimum contrast ratios so text remains readable for users with low vision or color-perception differences.
Use it while choosing brand colors, button states or text-on-background combinations for accessible interfaces.
READ THE OUTPUT
How to understand your results
Three signals that matter most when interpreting this tool.
Text size matters
Large text has a lower minimum contrast requirement than normal body text.
AA vs AAA
AA is the common compliance target; AAA is a stricter, optional enhancement.
HOSTGRABER EXPERT GUIDE
Designing readable color combinations
Contrast ratio is calculated from the relative luminance of two colors, independent of hue, so two very different-looking color pairs can share the same ratio. Meeting WCAG thresholds materially improves readability for low-vision users and in bright environments.
Check primary text, links, form labels and disabled states against their backgrounds, and prefer AA compliance as a baseline, moving to AAA for critical reading content where practical.
PRACTICAL GUIDE
Getting a reliable answer from this tool
Generators save time, but generated values still need safe deployment practices. Review the output before using it in production, keep secrets out of public repositories and test configuration changes in a reversible way.
For server automation and security material, use least privilege, backups and change control. A correctly generated value can still cause downtime if it is applied in the wrong place or without validation.
GO FROM DIAGNOSIS TO SOLUTION
Build it better with HostGraber
Found a configuration problem or planning your next deployment? These HostGraber services are the most relevant next steps for this tool.
THREE SIMPLE STEPS
Use Color Contrast Checker in seconds
01
Enter the details
Provide the domain, IP address, workload, server specification or calculator inputs requested by the tool.
02
Run the check
HostGraber validates the input and processes the request using the appropriate DNS, network, SSL or calculation logic.
03
Act on the result
Review the output, copy it when needed, compare related checks and use the linked HostGraber resources for the next step.
COMMON QUESTIONS
Color Contrast Checker FAQ
Clear answers for common color contrast checker questions.
What contrast ratio do I need for body text?+
WCAG AA requires at least 4.5:1 for normal text and 3:1 for large text.
What counts as large text?+
Text at least 18pt, or 14pt bold, generally qualifies for the large-text threshold.
Does this check color blindness specifically?+
No. It checks luminance contrast, which helps overall readability but does not model every color-vision difference.
FROM TOOL TO INFRASTRUCTURE
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