Last updated: October 29, 2026.
What the tools store
The ruler and calculator run in your browser. Your calibration value, chosen unit and ruler edges are saved in your browser’s local storage on your device so they are ready next time. They are not sent to us. You can clear them at any time with Reset calibration or by clearing your browser data.
What we do not collect
We do not ask for an account, and we do not receive the measurements you take or the objects you measure.
Contact form
If you use the contact form, we receive the name, email address and message you enter, and we use them only to reply to you.
Server logs and cookies
Like most websites, our hosting provider may keep standard server logs such as IP address, browser type and pages visited, for security and to keep the site running. Our website may set technical cookies needed for it to work.
Third parties
We do not sell your data. If we add analytics or advertising in the future, we will update this page first.
Contact
Questions about privacy? Use our contact page.