Cookie Policy
Last updated: August 22, 2026
Screen Ruler does not use cookies — no session cookies, no advertising cookies, no third-party tracking cookies. Nothing is set in your browser's cookie jar by this site.
Cookies vs. local storage
These two are often confused, so to be precise: a cookie is a small piece of data sent to a server with every request, typically used to identify a visitor across page loads. Local storage is different — it's a browser-only storage area that a page can read and write, but which is never automatically sent anywhere.
Screen Ruler uses local storage, not cookies, to remember one thing: the pixels-per-millimeter value from your last screen calibration, so you don't have to redo it every visit. That value never leaves your browser.
What's stored
| Name | Type | Purpose | Sent to a server? |
|---|---|---|---|
screenRulerCalibration_v1 | localStorage | Remembers your screen's calibration | No |
Third-party requests
This page loads the Inter typeface from Google Fonts, which involves a request to Google's servers for the font files. Google may set its own cookies or log request data under its own policies — see our Privacy Policy for details.
Managing local storage
You can clear the stored calibration at any time through your browser's site settings (usually under "Site data" or "Storage" in your browser's privacy settings), or by using your browser's private/incognito mode, which discards it automatically when you close the window.