How to Use the Color Contrast Checker

2. How to use the Color Contrast Checker

Here is the whole process, step by step. It takes less than a minute from opening the tool to seeing your result.

1. 1Fill in the Text color, Background fields.
2. 2Your result appears on the page.

Press the "⇄ Swap colors" button and your result appears on the page.

Everything runs in your browser — your files and text never leave your device.

3. What you can do with it

• Run the tool with the "⇄ Swap colors" button when your input is ready.

4. Tips for best results

1. Your text never leaves your device — The tool runs entirely in your browser using JavaScript. Nothing is uploaded, so you can paste private documents without worry. That also means there is no account to create and no file to upload.
2. It works on your phone too — Open the tool in any modern browser on Android or iPhone. The layout adjusts to the screen and everything works the same way on a small screen as on a desktop.

Related tools

More developer tools you may like — all free, no signup.

• Diff Checker — Compare two texts or code files side by side and highlight added and removed lines and words. · how-to guide
• HEX to RGB Color Converter — Convert colors between HEX, RGB, HSL and CMYK with a live picker and CSS-ready output. · how-to guide
• JSON Formatter & Validator — Format, beautify, validate and minify JSON with clear error messages and line numbers. · how-to guide
• Base64 Encode / Decode — Encode text to Base64 or decode Base64 back to text, with full UTF-8 and URL-safe support. · how-to guide
• URL Encode / Decode — Percent-encode text for safe use in URLs and query strings, or decode encoded URLs. · how-to guide
• UUID Generator — Generate cryptographically secure random UUID v4 / GUID values in bulk. · how-to guide