Contrast Checker

Check WCAG color contrast ratios.

Aa

Large Text Preview

Normal text preview — The quick brown fox jumps over the lazy dog.

12.68
Contrast Ratio
WCAG AA
✓ Normal Text (≥4.5)✓ Large Text (≥3.0)
WCAG AAA
✓ Normal Text (≥7.0)✓ Large Text (≥4.5)

WCAG 2.1

Check AA and AAA compliance levels.

Live Preview

See text on background in real-time.

Color Picker

Pick foreground and background colors.

Client-side

All processing in your browser. No data uploaded.

About Contrast Checker

WCAG Contrast Checker instantly calculates the contrast ratio between any two colors and tells you whether that combination meets the Web Content Accessibility Guidelines (WCAG 2.1) for legibility. Accessible color contrast is essential for users with low vision or color-blindness and is a core requirement for legal compliance in many jurisdictions. WCAG defines two conformance levels: AA (the minimum acceptable standard) requires a ratio of at least 4.5:1 for normal text and 3:1 for large text, while AAA (the enhanced level) demands 7:1 for normal text and 4.5:1 for large text. Enter your foreground (text) and background colors using the color pickers or HEX input fields, and the tool computes the ratio in real time. A live preview shows sample text so you can judge readability at a glance, not just by numbers alone.

How to Use Contrast Checker

  1. Click the "Text Color" picker or type a HEX value to set your foreground color.
  2. Click the "Background" picker or type a HEX value to set your background color.
  3. Read the contrast ratio displayed prominently in the center — green means accessible, yellow means marginal, red means failing.
  4. Check the WCAG AA and AAA result badges to see exactly which levels pass or fail.
  5. Use the swap button (⇄) to quickly reverse the foreground and background colors.
  6. Adjust one or both colors until all required WCAG badges show a pass checkmark.

Frequently Asked Questions

What contrast ratio do I need to pass WCAG AA?

Normal body text needs a ratio of at least 4.5:1. Large text (18pt/24px or 14pt/18.67px bold) needs at least 3:1.

What is the difference between WCAG AA and AAA?

AA is the widely adopted minimum standard. AAA is the enhanced level requiring higher ratios (7:1 for normal text) and is typically targeted by government and healthcare sites.

My ratio is 4.2 — how do I fix it?

Darken the text color or lighten the background (or vice versa) until the ratio reaches 4.5. Even small adjustments to lightness can push a near-miss to a pass.

Does this tool handle semi-transparent colors?

The tool works with opaque HEX colors. If you are using rgba with transparency, first calculate the effective blended color on its background before testing.

Can I test colors for non-text elements like icons?

WCAG 1.4.11 (Non-text Contrast) requires a 3:1 ratio for UI components and icons. Use the Large Text AA badge as a proxy for that requirement.

The Complete Guide to Contrast Checker: Free & Fast Online Utility

Professional, secure, client-side Contrast Checker designed for developers, designers, and digital creators

In modern digital workflows, speed, accuracy, and security are paramount. Contrast Checker is built to solve your daily challenges: Check WCAG color contrast ratios.. Instead of installing heavy desktop programs or writing custom conversion scripts, you can accomplish your tasks instantly on Metoolzy with zero friction.

Why Choose Metoolzy's Contrast Checker?

  • Lightning Fast Execution: Real-time processing in milliseconds to accelerate your daily workflow.
  • 100% Private & Secure: Client-side execution ensures your data never leaves your browser or touches external servers.
  • Completely Free Forever: No paywalls, no subscription traps, and no account registration required.
  • Clean & Modern UI: Thoughtfully designed for seamless usability across desktop, tablet, and mobile browsers.

How to Use Contrast Checker in 3 Simple Steps

  1. Open the Contrast Checker page on Metoolzy.
  2. Enter or paste your raw input into the workspace, or upload your source file.
  3. Inspect the real-time output and click Copy or Download to use your result.

Feature Comparison Table

Feature Metoolzy Contrast Checker Standard Online Tools Desktop Software
Pricing 100% Free Forever Often freemium / Ads-heavy Costly recurring license
Data Privacy Client-side local execution May store data on cloud servers Local processing
Speed Instantaneous (<100ms) Subject to server latency Hardware dependent
Installation Zero installation needed Zero installation Requires disk space & setup

Practical Applications & Use Cases

  • Software Engineers: Streamline data transformation, debugging, and format validation in development workflows.
  • UI/UX Designers: Quick utilities for color, format, and interface asset optimization.
  • Content Creators & Marketers: Format and structure digital assets efficiently without specialized tools.

Frequently Asked Questions (FAQ)

Does Contrast Checker store or log my confidential data?

No. Metoolzy processes everything locally inside your browser using client-side JavaScript. Nothing is sent to our servers.

Can I use this tool on my mobile phone or tablet?

Yes, our interface is fully responsive and optimized for touch devices.

Are there any usage quotas or limits?

No, you have unlimited free access with no restrictions.