Privacy Policy

Last updated: December 25, 2025

This Privacy Policy describes how the Free Online STL Viewer ("the Service") handles your information. Your privacy is critically important to us. This Service is designed with your privacy in mind, particularly regarding your personal data and the 3D model files you interact with.

1. Data We DO NOT Collect or Store

The core principle of our Free Online STL Viewer is client-side processing. This means:

  • Your STL Files: When you upload or drag-and-drop an STL file into the viewer, the file is processed directly within your web browser. Your STL files are never uploaded to our servers or any third-party servers. They remain on your device throughout the viewing process.
  • Personal Identifiable Information (PII): We do not collect any personally identifiable information from you, such as your name, email address, IP address, or location data, while you use the core viewing functionality of the Service.
  • Usage Data: We do not track individual user behavior or collect detailed usage analytics.

2. How We Process Your Files (Local Processing)

The processing of your 3D model files occurs entirely on your device using JavaScript and the Three.js library. This approach ensures:

  • Maximum Privacy: Your sensitive design files never leave your computer, protecting your intellectual property and confidential data.
  • Speed: Processing locally often means faster loading times as there's no server upload/download involved.
  • Security: By keeping your files on your device, we eliminate the risk of server-side data breaches related to your uploaded models.

3. Cookies and Tracking Technologies

The Free Online STL Viewer does not use traditional cookies or other tracking technologies (like web beacons or pixels) to collect personal data or track your activity across different websites. We aim to provide a service that respects your privacy without invasive tracking.

However, your browser may store minimal, non-identifying information necessary for the application to function correctly (e.g., browser-specific cache for faster loading of static assets like our stylesheet or JavaScript libraries from CDNs). This is standard browser behavior and is not used by us for tracking purposes.

4. Third-Party Services

This Service utilizes the following third-party services, primarily for delivering necessary libraries:

  • CDN (Content Delivery Network) for Three.js: We use unpkg.com to serve the Three.js library and its addons. CDNs may have their own privacy policies regarding access logs, but they do not receive your STL files or any personal data from our Service.

We do not integrate with analytics services (like Google Analytics) or advertising networks that would typically collect user data.

5. Your Rights

Since we do not collect or store your personal data, many standard data subject rights (like access, rectification, erasure) do not directly apply in the traditional sense. However, we uphold your fundamental right to privacy by design.

  • Control over your data: You retain full control over your STL files as they are processed on your device. You can delete them from your local machine at any time.
  • Opt-out: Simply by not using the Service, you are opting out of any interaction with it.

6. Changes to This Privacy Policy

We may update our Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page. You are advised to review this Privacy Policy periodically for any changes. Changes to this Privacy Policy are effective when they are posted on this page.

7. Contact Us

If you have any questions about this Privacy Policy, please contact us:

Website Owner: Jalal Achkoune, passionate Computer Engineer from Morocco.

Thank you for choosing the Free Online STL Viewer. We are committed to providing a secure and private experience for all our users.