Check the contrast ratio between two colors against WCAG AA and AAA standards. Essential for accessible web design.
Calculate the percentage increase or decrease between two values. Essential for financial analysis and growth tracking.
Calculate the percentage difference between any two numbers. Useful for comparing data sets, prices, and measurements.
Simplify ratios to their lowest terms. Enter a ratio in the form a:b and get the simplified version.
Calculate the aspect ratio from width and height dimensions. Find the simplified W:H ratio for images, videos, and screens.
Compare two texts side by side and see additions and deletions highlighted. Essential for version comparison and content review.
Contrast Checker lets you check the contrast ratio between two colors against WCAG AA and AAA standards. Essential for accessible web design.. Everything runs inside your browser — nothing is uploaded to a server. It works on any device with a modern web browser.
Check the contrast ratio between two colors against WCAG AA and AAA standards. Essential for accessible web design. It's ideal for developers, designers, and anyone who needs to check the contrast ratio between two colors against wcag aa and aaa standards without installing software or sending data to external servers.
Direct text entry, file upload, or URL-based input — depending on the tool. Paste or type your content directly into the provided editor area.
Yes. After the initial page load, Contrast Checker runs entirely on your device with no internet connection needed. All processing is done locally.
Yes, this tool is completely free. No credit card or registration is required for standard usage.
All processing happens 100% locally in your browser. Your data is never uploaded to any server.
Yes. Once the page has loaded, the tool runs entirely offline without requiring an internet connection.
Standard tools are unlimited. Pro tools allow free daily usage with an option to upgrade.
Any modern web browser (Chrome, Firefox, Safari, Edge) on desktop or mobile. No installation needed.
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