Privacy Policy
Last Updated: September 2026 · GDPR & CCPA Compliant
Your privacy is paramount when using Online Ruler (RealLineal.com). This Privacy Policy explains our commitment to transparency, technical minimization, and why our software operates entirely on the "Privacy by Design" model.
1. 100% Client-Side Processing (Zero Data Transmission)
Every screen measurement, coordinate calculation, credit-card calibration slider adjustment, and guide line placement occurs strictly inside your browser's local sandbox. No camera streams, screen snapshots, physical dimensions, or measured data are ever transmitted to our servers or third parties.
2. Browser Local Storage (Preferences)
To prevent you from having to recalibrate your display on every visit, Online Ruler uses standard browser storage (localStorage) solely to persist your client configurations:
online_lineal_css_ppi: Your calibrated physical screen pixel density.online_lineal_unit: Selected default measurement unit (cm, mm, in, px).online_lineal_edges: Active visibility toggles for the 4 screen rulers.online_lineal_theme: Dark or light color scheme preference.
These keys reside solely on your device. You can purge them at any time by clearing your browser cache.
3. Zero Tracking Cookies or Ad Networks
We do not utilize cross-site tracking cookies, behavioral ad pixels, or third-party fingerprinting. Essential infrastructure logs (such as IP address and user-agent) are processed strictly for DDoS defense and CDN reliability, and are regularly purged and anonymized.
4. Your Rights Under GDPR & CCPA
Because we store no identifiable personal records or account databases, we do not monetize or hold personal profiles. If you have questions regarding our technical privacy guarantees or wish to request data verification, you may reach out via our contact page.