Contrast Checker
Check Contrast and get a plain-English verdict you can act on.
Workspace
ReadyThat isn’t a valid HEX color
Use a six-digit value such as #0f9d76.
Free online Contrast Checker
Check Contrast and get a plain-English verdict you can act on. The Tools4U Contrast Checker is part of our Design & Color collection of Accessibility utilities. It works online in any modern browser — no download, no sign-up and no file upload, so your data never leaves your device.
How to use
Using Contrast Checker in three steps
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1
Add your input
Paste text, drop a file, or type directly into the workspace.
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2
Run the tool
Choose the options you need and press the action button.
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3
Copy or download
Take the result with one click — nothing is stored anywhere.
Features
Why people use this tool
Instant results
Everything runs locally, so results appear as you type.
Privacy-first
Your input never leaves the browser. No uploads, no logs.
Handles big inputs
Comfortable with large files and long documents.
Always free
No account, no limits, no watermark on results.
FAQ
Frequently asked questions
Is Contrast Checker free to use?
Is my data uploaded to a server when I use Contrast Checker?
Can I use Contrast Checker on mobile?
Do I need to install any software to use Contrast Checker?
Keep going
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