Privacy Policy — Metric Book Transcriber

Last updated: 2026-03-14

Metric Book Transcriber (“the Add-on”) is an open-source Google Docs™ Editor add-on that helps users transcribe images of metric books (birth, marriage, and death registers) using the Google™ AI (Gemini™) API.

Data the Add-on Accesses

Data	Why	Where it goes
Google AI (Gemini) API key	Required to call the Gemini API on the user’s behalf.	Stored in Google Apps Script User Properties (private per Google account). Never sent anywhere other than Google’s Generative Language API endpoint.
Document content (Context section)	The text under the “Context” heading in the active Google Doc is read to build the transcription prompt.	Sent to the Google AI (Gemini) API as part of the prompt. Not stored elsewhere.
Selected image	The image the user selects for transcription is read from the document.	Sent (base64-encoded) to the Google AI (Gemini) API. Not stored elsewhere.
Google Drive™ folder contents (file names and images)	When using “Import Book from Drive Folder,” the add-on reads image files from the specified folder.	Images are inserted into the user’s Google Doc. File metadata and blobs are processed in memory only.

Data Storage

The API key is stored in Google Apps Script User Properties, which are private to each Google account. Other users of the same add-on cannot access another user’s key.
The add-on does not maintain any external database, server, or persistent storage outside of Google Apps Script User Properties.
The add-on does not store document content, images, or transcription results outside the user’s own Google Doc.

Third-Party Services

The add-on sends data to a single third-party service:

Google AI (Gemini) API (generativelanguage.googleapis.com) — to perform image transcription. The data sent consists of the document Context text and the selected image. Google’s own privacy terms govern how Google processes this data. See Google’s AI Privacy Policy.

The add-on does not send data to any other third-party service.

Analytics and Tracking

The add-on does not collect analytics, telemetry, usage metrics, or tracking data of any kind.

Cookies

The add-on does not use cookies.

The add-on does not share, sell, or transfer user data to any third party except as described above (Google AI API calls initiated by the user).

User Control

Users can delete their stored API key at any time by running PropertiesService.getUserProperties().deleteProperty('GEMINI_API_KEY') in the Apps Script editor console, or by entering a new key through the add-on’s “Set API Key” dialog.
Users can uninstall the add-on at any time, which removes all User Properties associated with it.
The add-on only processes data when the user explicitly triggers a menu action (Transcribe Image or Import Book from Drive Folder). It never runs in the background.

Children’s Privacy

The add-on is not directed at children under the age of 13 and does not knowingly collect personal information from children.

Changes to This Policy

If this policy changes, the updated version will be posted in this repository with a new “Last updated” date.

Contact

For questions about this privacy policy, open an issue at github.com/dekochka/geneascript-gdoc-addon/issues.