Privacy policy

GERIX Library app, by Gerix AMN. Last updated: 8 October 2026.

GERIX Library is a personal PDF library that works on your phone without internet. This page explains, in plain words, what the app keeps and what it does not.

What the app keeps on your phone

• A copy of the PDFs you add, in a private folder of the app, and a small cover image of each one.
• The text inside the PDFs, so that search works.
• The name, category, tags and description you give each PDF, your favourites and the last page you read.
• Your categories and your choices: theme, language, dark reading, lock.
• If you turn on the lock, the PIN is never stored as you type it: the app keeps only an encrypted digest of it, from which the PIN cannot be worked out.

All of this stays on your phone. Your PDFs and their text are never sent to any server, there are no accounts or passwords, and Android's automatic cloud backup is turned off for this app.

Text recognition

When a PDF is made of photos, the app reads the text of the pages with Google's text recognition (ML Kit), which runs on the phone itself. The pages are not sent to the internet.

Fingerprint

The fingerprint and the phone's screen lock are handled by Android itself. The app only receives the answer "right" or "wrong": it never sees or keeps your fingerprint, your pattern or your phone's code.

Backups and Excel

When you choose "Export backup" or "Export list to Excel", the app creates the file and hands it to Android, and you choose where to save it or who to send it to. The backup includes your PDFs and the library data, but not the PIN.

Ads

The app shows Google AdMob ads so that it can stay free. AdMob may collect device identifiers and information about the ads you have seen, to choose them and to count them. That collection is made by Google and follows its rules: how Google uses information. Google does not receive your PDFs or anything you type in the app.

• Ads never appear while you are reading a PDF.
• The banner appears at the bottom of Home, Library and the categories.
• Now and then, when you close a PDF, a full-screen ad may appear, which closes with the X.

Permissions the app asks for

• Internet and network state: only for the ads. Reading, searching and recognising text work without internet.
• Fingerprint: only if you turn on fingerprint unlock.
• Files: the app does not ask for access to your files. When you add a PDF, you pick it yourself in the Android window, and the app only receives that file.

Children

The app is not meant for children under 13 and does not ask for a real name, age, e-mail, phone number or location.

Deleting your data

Since nothing leaves the phone, you can delete any PDF inside the app, or uninstall the app or clear its data in Android settings so that nothing is left. Note: uninstalling also deletes the PDFs kept inside the app, so export a backup first if you want to keep it.

Contact us

Gerix AMN, Mozambique. E-mail: albertonota2004@gmail.com