Contrast Checker Online — No Login, No Sign-Up Required
Tired of tools that force you to create an account before you can do anything? FlexyPdf's Contrast Checker requires zero registration. No email address, no password, no social media login, no "sign up to continue" popups. You open the page, use the tool, and you are done. Your privacy is protected because we never collect personal information — there is no account to create, no profile to manage, and no marketing emails to unsubscribe from. This makes our Contrast Checker ideal for quick one-time tasks and for users who value their privacy.
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.