Bitwarden is a freemium open-source password management service that is used to store sensitive information, such as website credentials, in an encrypted vault.

[9][10] Client functionalities include 2FA login, passwordless login, biometric unlock, passkey management, a random password generator, a password strength testing tool, login/form/app autofill, the ability to sync across unlimited platforms and devices, storage of an unlimited number of items, and storing a variety of information including credit cards.

Inside the vault, a user can save logins (username and password combination, passkeys and TOTP seeds), cards (debit and credit), identities (billing data and other information concerning an individual) and secure notes (free-form text).

[20] Bitwarden can be operated on web interfaces, desktop applications (Windows, MacOS, and Linux), browser extensions (Chrome, Firefox, Safari, Edge, Opera, Vivaldi, Arc, Brave and Tor), or mobile apps (Android, iOS, iPadOS and watchOS).

[33][31] In June 2018, Cliqz performed a privacy and security review of the Bitwarden for Firefox browser extension and concluded that it would not negatively impact their users.

"In March 2018, Bitwarden's web vault was criticized for embedding unconstrained third-party JavaScript from BootstrapCDN, Braintree, Google, and Stripe.

"[48] Critics have praised the features offered in the software's free version, and the low price of the premium tier compared to other managers.

[49][53] Nevertheless, Tom's guide found some features to be less intuitive than they could be,[49] while PC Magazine criticized the high price of the business tier.

[54] Mobilesyrup was disappointed by the simplistic graphics of the user interface, and felt that it was missing a few features found in competitors' offerings.

[50] Bitwarden debuted in August 2016 with an initial release of mobile applications for iOS and Android, browser extensions for Chrome and Opera, and a web vault.

[55] In February 2017, the Brave web browser began including the Bitwarden extension as an optional replacement password manager.

[65] Passwordless.dev provided an open source solution allowing developers to easily implement passwordless authentication based on the standards WebAuthn and FIDO2.