1. Client-Side Calculation Guarantee (Zero Server Transmission)
Unlike legacy conversion websites that send your inputs to a remote server for processing, KM to Miles Online runs every calculation directly inside your client's local browser runtime (via vanilla JavaScript).
When you enter a distance in kilometers, adjust your running pace per mile, or scrub the speed converter slider:
No HTTP POST or GET requests carrying your calculation numbers are dispatched to our servers.
No backend server or application database receives, evaluates, or logs your numbers.
Privacy by Architecture: Because our website has no calculation backend, we cannot see what distances you calculate, what running paces you target, or what speeds you convert. Your data remains strictly on your device.
2. Information We Do Not Collect or Store
We do not collect, store, or sell any personal data. Specifically:
- No User Accounts: We do not offer or require user registration, logins, passwords, or personal profiles.
- No Calculation Logging: We do not log individual conversions, race times, or geographic travel plans.
- No Invasive Tracking Cookies: We do not set third-party cross-site advertising cookies or behavioral tracking beacons.
- No Data Monetization: We do not sell, rent, or lease user data to third-party advertisers or data brokers.
3. Transparent Analytics & Web Metrics Disclosure
To maintain server uptime, monitor bandwidth consumption, and understand high-traffic conversion pairs, we may collect lightweight, anonymized aggregate telemetry.
These aggregated metrics may include:
- Total page views and aggregated referral sources (e.g. search engines or direct visits).
- Approximate geographic region at the country or state level (derived from anonymized IP addresses).
- Technical device characteristics: browser type, screen resolution category, and operating system (e.g., Chrome on Windows).
These aggregate metrics are never joined with individual identities, never used to build personal browsing profiles, and fully honor Do Not Track (DNT) and Global Privacy Control (GPC) browser headers.
4. Browser Local Storage Utilization
Our application utilizes your browser's local storage (localStorage) for one single purpose:
km_theme: Remembers whether you prefer Dark Theme or Light Theme across visits.
This preference value is stored purely on your local machine and is never transmitted to any external server. You can clear your local storage at any time through your browser's privacy settings without impacting tool functionality.
5. Third-Party CDNs & Fonts
To ensure rapid page delivery and crisp typography, KM to Miles Online loads select static assets over encrypted HTTPS:
- Google Fonts: Serves the Outfit and JetBrains Mono typefaces directly from Google's content delivery network without setting tracking cookies.
- Edge CDN Hosting: Delivers static HTML, CSS, and SVG assets through distributed edge caching servers.
6. Children's Privacy (COPPA & GDPR-K)
KM to Miles Online is an educational and mathematical utility suitable for all ages. We do not knowingly collect or maintain any personal information from children under the age of 13 (under COPPA) or under the age of 16 (under EU GDPR). Because our website collects no personal data from any visitor, children can safely utilize our calculators for math homework, athletic training, and science projects.
7. Changes to This Privacy Policy
We may occasionally update this Privacy Policy to reflect technical enhancements or statutory updates. Any revisions will be published on this page with an updated effective date. Continued use of the website following revisions represents acknowledgment of the updated policy.
8. Contacting Us Regarding Privacy
If you have any questions, suggestions, or concerns regarding our privacy practices or client-side calculation architecture, please reach out to our privacy desk: