1. Data Collection
Online Ruler is intentionally designed with strict data minimization principles. We do not collect, store, transmit, or monetize any personal information, hardware serials, device fingerprints, or measurement inputs.
When you use the calibration tools or drag guides across the ruler canvas, all rendering and computations occur entirely inside your browser's JavaScript runtime engine.
2. Local Storage Usage
To provide a seamless user experience, Online Ruler utilizes your browser's native localStorage API to preserve your custom preferences between sessions. Specifically, we store:
- Calibration PPI Ratio: Your calibrated pixels-per-inch or screen diagonal value.
- Selected Measurement Unit: Centimeters, millimeters, decimal inches, fractional inches, or pixels (px).
- Theme Preference: Dark mode or light mode state.
- Active Orientation & Edge: Top, bottom, left, or right ruler docking selection.
This data stays exclusively on your device. It is never uploaded to any remote database. You can clear this data at any time via your browser settings or by resetting calibration inside the tool.
3. Anonymous Usage & Accounts
Online Ruler does not require user accounts, email sign-ups, or social logins. You are free to use all ruler features, calibration modes, and guides with total anonymity.
4. Third-Party Services
We do not embed third-party tracking networks, analytics monitors (such as Google Analytics or Facebook Pixel), or marketing pixels. The website is hosted on modern high-speed CDN infrastructure that delivers static assets with minimal request headers.
5. Cookies & Tracking Mechanisms
Online Ruler does not use tracking cookies, cross-site beacons, or canvas fingerprinting. All stateful behaviors rely solely on first-party localStorage within your device origin.
6. Children's Privacy (COPPA & GDPR Compliance)
Online Ruler is a safe, educational, and utility-oriented application appropriate for users of all ages. Because we do not collect any personal data whatsoever, we comply fully with the Children’s Online Privacy Protection Act (COPPA) and General Data Protection Regulation (GDPR).
7. Changes to This Privacy Policy
We may periodically update this Privacy Policy to reflect technical enhancements or regulatory requirements. Any modifications will be posted here with a revised "Last updated" date.
8. Contacting Us Regarding Privacy
If you have any questions, suggestions, or concerns regarding this Privacy Policy or the security of Online Ruler, please reach out via our contact page.