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A time-based one-time password app with optional syncing through a Google Account.
Product details checked on 2026-10-31.
Google Authenticator can generate one-time sign-in codes offline, and it also offers optional account sync. Keeping codes only on a device limits cloud exposure but makes a lost phone harder to recover; syncing is more convenient but links the codes to your Google Account. Save each service’s backup codes somewhere separate and secure.
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