Best Practices for Anonymous Authentication

Anonymous Firebase Authentication can reduce onboarding friction by letting users try an app without immediately creating a password-based or federated account, while still giving developers a stable UID to associate with cloud-stored data such as Firestore records. Users can later convert their anonymous account into a permanent account by linking credentials such as Google, Apple, or email/password, preserving the original UID and all related data. Because anonymous accounts cannot be recovered after sign-out or used across devices, apps should prompt users to upgrade when they reach features that benefit from a persistent identity, such as sharing content. Developers should also remove abandoned anonymous accounts and their associated data, restrict sensitive capabilities through client logic, Security Rules, and Cloud Functions, and use Firebase App Check rather than anonymous authentication to verify that requests originate from a legitimate app.

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