How Online Ruler uses cookies and browser storage, and how to control them
Last updated 2026/09/02
Cookies are small text files that a website places on your device. Browser
storage (such as localStorage) is a similar mechanism that lets a site keep
settings on your device without sending them to a server.
The Site itself does not set any cookies. It uses localStorage for
settings that make the tools work between visits:
| Item | Purpose | Lifetime |
|---|---|---|
| Screen calibration | Remembers the pixels-per-inch value so the ruler stays actual size | Until you clear site data |
| Unit and layout preferences | Remembers the unit (cm, mm, inches) and ruler options you chose | Until you clear site data |
| Theme | Remembers whether you chose light or dark mode | Until you clear site data |
None of this data is sent to us or to third parties.
When advertising or analytics is enabled for this deployment, third parties may set cookies on your device:
IDE and _gcl_*) to serve and
measure ads and, where permitted, to personalise them based on your browsing
history. See How Google uses cookies._ga and _ga_* from Google Analytics)
help us understand aggregate traffic, such as which tools are used most.These cookies are controlled by the third party, not by us.
Blocking cookies does not affect the measuring tools themselves.
We may update this policy from time to time. The date at the top of this page shows the latest revision.
If you have questions about this policy, use the contact details published in the site footer.