About this tool.

My Mouse DPI is a free, open-source web tool that accurately measures your mouse's DPI (Dots Per Inch) using modern browser APIs. No downloads, no sign-ups, no tracking.

Why we built this.

Most online DPI testers track cursor position on screen, which is inherently inaccurate due to OS mouse acceleration, screen edge clipping, and sub-pixel rounding. We wanted something better.

Our tool uses the Pointer Lock API to capture raw mouse movement data directly from the hardware sensor. Combined with screen calibration for accurate distance reference, this approach delivers the most precise browser-based DPI measurement possible.

Privacy.

This tool runs entirely in your browser. No data is sent to any server. Your calibration settings are stored only in your browser's localStorage. We don't use cookies, analytics, or tracking scripts.

Browser support.

The DPI analyzer requires the Pointer Lock API, which is supported in all modern browsers: