Ensure Accessible Design with ReadyTools' Color Contrast Checker
Ensure your digital designs are accessible to everyone. Analyze contrast ratios and verify WCAG compliance instantly.
Extract Colors from Image
Upload image
Auto-detects dominant colors
Select Colors
Text Color
#000000
Background Color
#ffffff
Contrast Score
Excellent21.00
Ratio
Normal Text (AA)
PASSNormal Text (AAA)
PASSLarge Text (AA)
PASSUI Components
PASSLive Preview
Modern UI Design
This simulates a real component. Good contrast improves readability for everyone.
Image Placeholder
Color Blindness Simulation
Preview
Readable text example.
Protanopia
Preview
Readable text example.
Deuteranopia
Preview
Readable text example.
Tritanopia
Preview
Readable text example.
Monochromacy
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Design for everyone with perfect color contrast.
Eliminate guesswork and ensure your website is legally compliant and visually accessible. Check contrast ratios, auto-fix failing colors, and extract palettes directly from images in seconds.
Instant WCAG AA & AAA compliance scoring
Extract dominant colors from any uploaded image
Smart auto-correction for failing color combinations
Contrast Analyzer
ExcellentFOREGROUND
#1c274a
BACKGROUND
#FFFFFF
7.14
Contrast Ratio
WCAG AA (Normal Text)
WCAG AAA (Large Text)
Drag & Drop an image here
hero-banner.jpg
Extracted Palette
Extract colors directly from your brand assets.
Don't know the exact HEX codes of your logo or marketing images? Simply drag and drop any image into our tool, and our color extraction algorithm will instantly build a palette and check the contrast between the most dominant colors.
Automatic Dominant Color Detection
Our system analyzes the pixels in your image and mathematically determines the best primary and secondary colors for your background and text.
Instant Contrast Validation
Once extracted, the colors are automatically placed into the contrast checker, letting you know immediately if your brand colors are web-safe.
Everything required for accessible design.
Go beyond simple ratio checking. Our toolset is designed for modern workflows where inclusivity is a requirement, not an afterthought.
Smart Auto-Correction
Failing WCAG tests? Stop guessing which shade of gray works. Our smart auto-fix algorithm instantly calculates the closest accessible shade of your selected color, saving you time while preserving your design intent.
Read More
FAIL 2.1:1Read More
PASS 5.8:1Color Blindness Simulation
Ensure your color choices remain readable for the 300+ million users with visual impairments. We simulate Protanopia, Deuteranopia, Tritanopia, and Achromatopsia in real-time.
Protanopia
Deuteranopia
Tritanopia
Achromatopsia
WCAG Guidelines Built-In
Never memorize compliance ratios again. We automatically grade your colors against the exact legal standards required for AA and AAA accessibility.
AA Normal
4.5:1
AAA Normal
7.0:1
Contextual UI Previews
A contrast ratio is just a number until you see it. Our contextual UI preview shows exactly how your foreground and background choices look on realistic web components, buttons, and text layouts.
Preview Context
See exactly how your chosen colors will look on real interface elements.
Why checking color contrast is critical for modern websites
Digital accessibility is no longer optional. According to the Web Content Accessibility Guidelines (WCAG), text must have a specific contrast ratio against its background to be considered readable. Failing to meet these standards doesn't just frustrate users—it actively blocks people with visual impairments, aging eyes, or even users in bright sunlight from consuming your content.
Our online color contrast checker solves this by mathematically comparing the relative luminance of your foreground and background colors. It provides a score between 1:1 (no contrast) and 21:1 (maximum contrast, like black on white).
Understanding WCAG AA vs AAA
The WCAG defines different levels of conformance. Level AA is the global standard for most commercial websites and legal compliance (such as the ADA in the US). It requires a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. Level AAA is a stricter standard, requiring 7:1 for normal text, often used by government agencies and highly specialized platforms.
Extracting Palettes from Images
Brand guidelines are often delivered as flat images or logos. Our built-in image color extractor uses advanced algorithms to isolate the dominant colors from any uploaded JPG or PNG. This allows developers to instantly convert a visual asset into a web-ready, contrast-tested CSS palette without needing external design software.
Frequently Asked Questions
Answers to common questions about color accessibility and contrast checking.