For as long as most of us can remember, logging into an online account has meant typing a password.

But that is starting to change. More websites and apps now offer passkeys, allowing you to sign in with your fingerprint, face recognition, or device PIN instead of remembering another password.

So, how do passkeys actually work, and what makes them different from the passwords we’ve been using for years?

What Are Passkeys?

Passkeys are a way to sign in to websites and apps without typing a traditional password. They are based on FIDO authentication standards and use your device to prove that you are the person who should have access to the account.

When you create a passkey, your device generates a pair of cryptographic keys. One key is kept private on your device or within your passkey provider, while the other is shared with the website or service.

When you sign in later, your device uses the private key to respond to a security challenge from the website. You normally just unlock your device with a fingerprint, face scan, PIN, or similar method.

The complicated cryptography happens in the background. You simply get logged in.

How Do Passwords Work?

Passwords are much more familiar.

You create a secret combination of letters, numbers, or symbols and enter it when you want to log in. Properly designed services don’t normally store your password as plain text; they use password hashing and other security measures to verify it.

The problem is that passwords are shared secrets. You have to enter that secret into a website, which creates opportunities for phishing, password theft, and reuse across multiple accounts.

A strong, unique password combined with multi-factor authentication can still provide good protection. But you still have to remember and protect the password itself.

Passkeys vs Passwords: What’s the Difference?

The simplest difference is how you prove that you own an account.

Passkeys are designed to be phishing-resistant because the credential is associated with the legitimate website or app. A fake website generally cannot simply collect your passkey the way it can collect a password.

Are Passkeys Really Passwordless?

For the website or app you’re signing into, generally yes.

But that doesn’t mean passwords disappear from your entire digital life. Your phone, computer, or passkey provider may still use a password or another security method to protect your account.

Some passkeys can also be synced across devices through supported credential managers. Others can be tied to a specific device or physical security key.

So when people say “passwordless,” they are usually talking about the login experience for the particular service supporting the passkey.

Why Are Passkeys Considered More Secure?

One of the biggest advantages of passkeys is that there’s no password for a phishing website to simply collect.

The private key stays protected, while the website receives and stores the public key. During login, cryptographic verification is used instead of sending a password that can be copied.

Passkeys are also designed to work with the legitimate website’s identity, which helps protect against common phishing attacks.

Of course, passkeys aren’t magic. Keeping your devices secure, protecting your main account, and having a sensible recovery method are still important.

What Happens If You Lose Your Device?

This depends on how the passkey is stored.

Some synced passkeys can be backed up and made available on other supported devices. Others can be device-bound, meaning the credential remains tied to a particular device or security key.

That’s why it’s worth checking how a service handles account recovery before making a passkey your only login option.

Which Should You Use?

The choice isn’t always as simple as “passwords are bad and passkeys are good.”

If a website supports passkeys, they provide a convenient way to sign in while addressing several common password weaknesses. If it doesn’t, use a strong, unique password and enable multi-factor authentication whenever possible.

The important thing is to avoid reusing the same password across important accounts and to keep your recovery options secure.

Conclusion

Passkeys are changing the way people log into online services. Instead of repeatedly typing a password, you can use your device to prove that you have the correct cryptographic credential.

Passwords are still widely used, and they aren’t disappearing overnight. But passkeys offer a different approach to login security—one designed to make phishing and stolen credentials much harder to exploit.

For users, the experience can be surprisingly simple: unlock your device, and you’re in.

External Sources/Links

• FIDO Alliance — Passkeys — Official overview of passkeys, their security model, syncing, and use cases.

• Google for Developers — Passkeys — Technical and user-focused explanation of how passkeys work.

• NIST — How Do I Create a Good Password? — Guidance on passwords, MFA, and passkeys.

• FIDO Alliance — Authentication Specifications — Background on FIDO2, WebAuthn, and CTAP.

 

FAQs

Are passkeys better than passwords?

Passkeys are designed to address several weaknesses of passwords, particularly phishing and credential reuse. However, account recovery and device security still matter.

Can passkeys be hacked?

No authentication method makes an account completely immune to attack. Passkeys are designed to make certain attacks, particularly phishing and credential theft, significantly harder.