Contrast Checker
Check WCAG contrast ratio between any two colors with AA and AAA pass/fail for normal and large text.
WCAG 2.1 relative luminance formula, computed live as you adjust colors.
About Contrast Checker
Check WCAG contrast ratio between any two colors with AA and AAA pass/fail for normal and large text.
Contrast Checker is designed to be open-and-go: everything runs in the page with clear on-screen controls, and results appear immediately without any setup.
How to Use Contrast Checker
- Open the tool and allow any permission it asks for (only if needed).
- Follow the on-screen controls to run the task.
- Review the result shown live on the page.
- Copy, save or share the output as required.
Key Features
- No installation or account — just open the page and use it.
- Clear, guided interface that works on desktop and mobile.
- Everything runs locally in your browser for privacy and speed.
Frequently Asked Questions
Do I need to install anything for Contrast Checker?
No. Contrast Checker runs entirely in your web browser — there is nothing to download, install or configure.
Is Contrast Checker free to use?
Yes. Contrast Checker is completely free with unlimited use — no account, download or payment required.
Is my data uploaded to a server?
No. Contrast Checker runs entirely in your browser. Your inputs are never sent to our servers or stored anywhere.
Does Contrast Checker work on mobile?
Yes. The interface is fully responsive and works in any modern browser on Android, iPhone, tablets and desktops.
Related Utility Tools
Quotation Generator
Create professional quotations and estimates for clients. Generate PDF quotes instantly.
Receipt Generator
Generate receipts for payments and purchases. Create professional receipts instantly.
QR Payment Generator
Generate QR codes for payments. Create UPI and payment QR codes easily.
Social Media Post Scheduler
Plan and schedule your social media posts. Create a content calendar.