Contrast Checker Online — No Watermark on Output
Many free online tools add watermarks to your output — a logo, a URL, or "made with…" branding that ruins professional documents. FlexyPdf's Contrast Checker never adds watermarks to your files. Every output is clean, unmarked, and ready for professional use. Whether you are preparing documents for clients, creating content for your business, or working on school assignments, your results look exactly as you intended — without any third-party branding. This is not a limited trial feature; watermark-free output is always included at no cost.
How to Use Contrast Checker
Select Colors
Enter or pick your foreground (text) and background colors using HEX codes or the color picker.
View Contrast Ratio
See the contrast ratio displayed prominently along with an overall accessibility rating.
Check WCAG Compliance
Review pass/fail results for each WCAG level: AA Normal, AA Large, AAA Normal, AAA Large, and UI Components.
Features
WCAG 2.1 Compliance
Check against all WCAG contrast requirements for text and UI components.
Live Text Preview
See how your color combination looks with actual text in a preview panel.
Color Swap
Quickly swap foreground and background colors with one click.
Clear Pass/Fail
Visual pass/fail indicators for each WCAG criterion.
Benefits of Using Contrast Checker
Completely Free
Use Contrast Checker without any cost, limits, or hidden fees. No premium plans needed.
No Installation
Works directly in your browser. No software downloads or plugins required.
100% Private
Your files and data are processed locally. Nothing is uploaded to external servers.
Works Everywhere
Compatible with Chrome, Firefox, Safari, Edge on desktop, tablet, and mobile.
No Sign-Up
Start using the tool immediately. No account creation or email verification.
Always Available
Access this tool 24/7 from anywhere in the world, on any device.
Frequently Asked Questions
Complete Your Design Tools Workflow
These free tools work seamlessly with Contrast Checker to handle every step of your workflow.