Privacy

Last updated: 13 November 2026

Without an account

Glossarium works without an account. The dictionary is downloaded once and then works on your device, even offline. Your saved words, lists, notes, history, progress and settings are kept only in your browser on this device. Nothing you look up is sent anywhere. There is no advertising and no tracking.

With "Sign in with Google" (optional)

If you choose to sign in, Glossarium uses Google Firebase so that your words are the same on all your devices. Then:

• Your Google account details that Google shares with the app: your name, email address, profile picture and a user ID. They are used only to sign you in and to show who is signed in.
• A copy of "My words": saved words, lists, notes, words marked as known, recent look-ups, practice progress and badges. It is stored in Google Cloud Firestore in Zürich, Switzerland (region europe-west6), in one record that only you can read or change.
• Your settings, the words you type into the search and your use of the dictionary are not sent.

Google acts as the service provider for sign-in and storage (Firebase privacy and security). Signing in may involve servers outside Switzerland that Google uses for its sign-in service.

Deleting your data

Open My words or Settings → Data in the app and choose Delete my account. This deletes your account and the copy of your words on the server at once. Sign out stops copying; the words stay on your device. To remove everything from a device, clear the site's data in your browser settings.

Who is responsible

Glossarium is a private project by Heitor Pais, Zürich. For questions about your data, write to the email address shown on the Google sign-in screen as the app's contact.