Privacy Policy
Last Updated: September 6, 2026
This Privacy Policy explains what data Online Ruler uses, where it is stored, and what you can control. The ruler runs in your browser and is designed to work without sending your measurements to our servers.
Information We Collect
Online Ruler does not require an account. The core ruler runs locally and does not ask you to upload images or measurement files. For convenience, your browser stores ruler settings on your device, including PPI, unit, display mode, snap preference, and calibration details (time, method, reference label/length). Calibration data may also include a simple device signature (devicePixelRatio and screen width/height) to detect when calibration might be stale.
The site may set a first-party language preference cookie (NEXT_LOCALE) so it can show your selected language on later visits.
How We Use Your Information
Local settings are used to remember your preferences between visits and to help show when a saved calibration may no longer match your current display environment. Measurements are calculated in your browser from your current settings.
Information Sharing
We do not sell or share measurement data because Online Ruler does not transmit your measurements as part of its core functionality. Like most websites, the hosting provider may process standard server logs (such as IP address and user agent) for security and reliability.
Analytics and Advertising Services
The following third-party scripts load on every page and may process standard device, browser, network, and usage data. Our application code does not intentionally send ruler coordinates, selection dimensions, calibrated PPI, or your chosen reference object to these services.
- Umami is used for aggregate traffic statistics and site improvement.
- Google Analytics is used to understand page usage and improve the website.
- Google AdSense is loaded for site verification and advertising. Google and its partners may use cookies, local storage, IP addresses, device or browser identifiers, and web beacons to serve, measure, and personalize ads, depending on settings and consent choices.
How Google uses data on partner sites · Google Ads Settings
Data Security
Local settings are protected by your browser and device. You should treat your device as the security boundary: if someone has access to your browser profile, they may be able to see or clear locally stored settings.
Your Rights
You control locally stored settings. You can clear them by removing this site's data in your browser settings. Using private/incognito mode may prevent settings from being saved.
Contact Us
If you have any questions about this Privacy Policy, please contact us.