The short version: we collect almost nothing, and we never sell or share your data. OnlineRuler runs entirely in your browser — your calibration settings never leave your device.
OnlineRuler ("we", "our", "the service") is committed to protecting your privacy. This policy explains what information we collect, how we use it, and your rights when using onlineruler.co.
We do not require you to create an account or provide any personal information to use OnlineRuler.
The ruler tool runs entirely in your browser. Any calibration data (your screen PPI, chosen calibration method, theme preference) is stored only in your browser's localStorage and never transmitted to our servers.
We may collect the following non-personal, aggregated data through standard server logs and analytics:
OnlineRuler does not use advertising cookies or third-party tracking cookies. We use localStorage (not cookies) to remember your calibration and theme preference between visits. This data never leaves your device.
You can clear this data at any time by clearing your browser's site data for onlineruler.co.
We do not load fonts, analytics scripts, or resources from third-party providers on this page. All typefaces used are system fonts already installed on your device, so no external requests are made and no data is shared with font providers.
We do not embed social media widgets, advertising networks, or any other third-party trackers.
We do not store personal data on our servers. Server access logs, if retained, are kept for no longer than 90 days and are used solely to diagnose technical issues.
OnlineRuler is a general-purpose tool suitable for all ages. We do not knowingly collect any personal information from children under 13.
Because we do not collect identifiable personal data, there is typically nothing for us to retrieve, correct, or delete on your behalf. If you have concerns, please contact us and we will respond promptly.
If you are located in the European Economic Area, you have the right to access, rectify, or erase any personal data we hold, and to lodge a complaint with your local supervisory authority.
We may update this Privacy Policy from time to time. The "Last updated" date at the top of this page reflects the most recent revision. Continued use of the service after changes are posted constitutes acceptance of the revised policy.
Questions about this Privacy Policy? We're happy to help.