BunchTool — Contrast Checker
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👁️ Sample Text Render

This is a large heading (AAA)

This is normal body text to evaluate the WCAG contrast pass scores.

🏆 WCAG Pass Scores
21.0 : 1
AA Normal: PASS
AA Large: PASS
AAA Normal: PASS
AAA Large: PASS
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Contrast Checker —
Free Online Contrast Checker

Our free Contrast Checker provides a professional, high-performance solution to check foreground and background relative luminance ratios against WCAG AA and AAA accessibility scores directly within your browser. Engineered for maximum speed and absolute privacy, the tool operates entirely on the client side using secure local JavaScript processing—meaning your data never leaves your device and is never uploaded to any external server. Whether you are working on a desktop, tablet, or mobile phone, the responsive and premium interface delivers instant real-time results with zero wait times. Designed for daily productivity, it features fully configurable parameters, robust input verification, and offline capability to ensure a seamless, secure workflow.

Extracts exact color hex codes and evaluates contrast accessibility ratings
Determines standard-compliance scores adhering to WCAG 2.1 guidelines
100% secure client-side calculation — your private data never leaves your device
Offline-ready execution with a responsive premium interface for mobile, tablet, and desktop
👁️
InstantLocal Processing
FreeAlways
BrowserComputed
How It Works

Use Contrast Checker in three steps

Step 1
📂
Upload or Input Data

Input your foreground (text) color and background color values using Hex codes.

Step 2
⚙️
Adjust Layout Options

Analyze the WCAG 2.1 contrast ratio scores for normal and large text sizes.

Step 3
🎨
View your result

Review the accessibility pass/fail compliance ratings and export the results if needed.

Why BunchTool

Why use our free Contrast Checker?

🎨
High-Definition Visual Outputs

Generates cohesive color palettes, audits contrast ratios under WCAG 2.1 guidelines, and extracts exact hexadecimal codes.

⚙️
Granular Visual Controls

Adjust border curve dimensions, customize background CSS gradients, configure QR code scale factors, and choose canvas crop margins.

🔒
Secure Client-Side Media Sandbox

Resize, crop, and convert images locally. Absolutely no graphic files are uploaded to any server, ensuring 100% media confidentiality.

FAQ

Frequently asked questions

Is the Contrast Checker free to use?
Yes — completely free with no file-size limits, no daily usage caps and no premium tier. All 247 tools on BunchTool are free forever, with no upsells or paywalls.
Is my data safe and private?
Absolutely. Your data is processed entirely inside your browser using client-side JavaScript. Nothing ever leaves your device or is uploaded to any server.
Does the Contrast Checker work offline?
Yes. Once this page has loaded in your browser, the tool continues to work without an internet connection. Your browser handles all the processing locally on your device.
Are my files sent to any server?
Absolutely not. All processing is strictly local and client-side. Your images and codes never leave your machine.
Is there a usage cap?
No, you can generate as many layouts and convert as many files as you need with no limits.
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