Why Is Bitwarden Considered an Open Source Password Manager?
Bitwarden is considered an open source password manager because its source code is publicly available, which lets anyone inspect, audit, and verify the security claims behind the product rather than taking them on trust. That transparency is paired with end-to-end encryption, so the credentials, passkeys, and other sensitive information you store are protected in a way that doesn't depend on the vendor's word alone. If your main question is "can I check for myself what this software actually does with my data," open source is the property that makes that possible.
What "open source" actually means here
Open source means the code that runs the product is published and readable. In practice, for a password manager, that changes what you can verify:
- Security claims become checkable. Instead of a marketing statement that data is encrypted, you (or an independent researcher) can read how encryption is implemented.
- Independent verification is possible. Bitwarden's site states it has "independently verified security claims," which is only meaningful when there's public code to verify against.
- Community scrutiny is continuous. Bugs and weaknesses can be found and reported by people outside the company, not only by internal teams.
This is the core difference from a closed-source password manager, where the same features may exist but the mechanism is hidden.
The encryption layer that sits on top
Open source and end-to-end encryption are separate properties, and Bitwarden relies on both:
| Property | What it gives you | Why it matters |
|---|---|---|
| Open source code | Anyone can inspect how it works | Security claims can be independently checked |
| End-to-end encryption | Your vault contents are encrypted so they aren't readable in transit or at rest by the service | Protection doesn't rely on trusting the vendor's handling |
The site describes Bitwarden as "the open source, end-to-end encrypted platform that scales with you," and frames the vault as the single place where credentials, passkeys, and sensitive information are stored. The combination is the point: encryption protects the data, and open code lets you confirm the protection is real.
Why transparency matters more for a password manager
A password manager holds the keys to everything else you use. That makes "trust me" a weak guarantee compared with "check for yourself." Open source shifts the basis of trust:
- You are not relying solely on the company's description of its own security.
- A public codebase invites review by people with no incentive to defend the product.
- Problems can surface through community channels rather than staying internal.
Bitwarden's site notes a community of 100,000+ members across GitHub, forums, and Reddit, which is the practical mechanism behind that scrutiny — a large group of people with access to the code and a place to discuss it.
Who this matters for
- Individuals who want to verify a security tool rather than assume it, and who value being able to inspect the software protecting their logins.
- Teams and enterprises that need to justify a security choice internally and prefer a product whose claims can be examined.
- Anyone comparing password managers where the deciding factor is transparency rather than a feature checklist.
If your priority is simply the shortest setup path and you're comfortable trusting a vendor's statements, open source may not be the deciding factor for you. If your priority is being able to check the mechanism yourself, it likely is.
How to confirm it yourself
- Look for the public code. Bitwarden's site points to community activity on GitHub, which is where the source lives and where issues are discussed.
- Read the security claims and look for the "independently verified" language. The site states its claims are independently verified — the value of that statement depends on the code being public, which it is.
- Check the encryption description. The site describes the vault as end-to-end encrypted; confirm what that covers (credentials, passkeys, sensitive information) against your own needs.
- Start with the free tier to evaluate. The site offers "Get Started Free," so you can test the product before committing to a paid plan.
A common snag: people treat "open source" as automatically meaning "more secure." It doesn't — it means the security is verifiable. The encryption still has to be implemented correctly, which is exactly why independent verification and a large reviewing community matter.
The short version
Bitwarden is called an open source password manager because its code is public, its security claims can be independently verified, and it combines that transparency with end-to-end encryption for stored credentials and sensitive information. For buyers who want to check rather than trust, that combination — public code plus encryption plus a 100,000+ member community — is the reason it stands apart from closed-source alternatives.