Online Ruler is designed to respect your privacy completely. We do not collect, store, process, or transmit any personal information, measurement coordinates, or calibration telemetry.
100% Client-Side Execution
All measurement calculations, unit conversions, guide positions, and calibration mathematics run strictly inside your web browser. No measurement dimensions or camera images are ever sent to an external server or API.
Local Storage Usage
We store your selected unit (cm/mm/in/px), theme preference, and screen calibration value solely in your browser's localStorage so your scale is preserved across visits. You can clear this data at any time by clicking Reset or clearing browser site storage.
No Tracking Cookies & No Fingerprinting
The core application does not use tracking cookies, analytics pixels, or third-party fingerprinting scripts.