Privacy Policy
Last updated: April 2026
Overview
AGS4 Viewer is a browser extension for viewing and validating AGS4 geotechnical data files. It runs entirely within your browser.
Data Collection
This extension does not collect, transmit, or store any personal data or user information.
Data Processing
All file processing (parsing, validation, viewing, diffing) happens locally in your browser. No data is sent to any external server.
When previewing a Gmail attachment, the extension reads the attachment bytes in the current tab only so that the AGS content can be rendered inline. Those bytes stay in your browser and are never transmitted by this extension.
Permissions
The extension requests the following permissions, used solely for the described purposes:
- Host permissions (all URLs): to detect AGS file links on webpages, provide hover hints for AGS terminology, and preview email attachments.
- Downloads: to detect when AGS files are downloaded and offer to open them in the viewer.
- Storage: to save user preferences such as the hover-hints toggle, download interception setting, and validation rule toggles. Stored locally in the browser only.
- Context menus: to add right-click options for field lookup and viewer access.
- Active tab: to interact with the current page for field detection and Gmail preview.
Third-Party Services
This extension does not use any third-party analytics, tracking, or data processing services.
Changes
Any changes to this privacy policy will be reflected in the extension update notes.
Contact
For questions about this privacy policy, open an issue on the project's GitHub repository.