Cookie Policy
What Are Cookies?
Cookies are small text files placed on your computer or mobile device when visiting websites. They help remember user preferences and analyze site traffic.
Types of Cookies We Use
Essential cookies support basic functionality and calibration persistence. Analytics and advertising cookies (from partners like Google AdSense) help us monetize and improve the free tool.
Local Storage & Calibration Data
In addition to cookies, Online Ruler utilizes browser localStorage to store your screen calibration preferences (e.g. online_ruler_px_per_mm, online_ruler_unit, and online_ruler_theme). This data is client-side only and never sent to our servers.