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Use a passkey whenever a service supports one and you have a clear recovery route. A passkey is a FIDO credential built from a public–private cryptographic key pair. A password is a reusable secret that you type or autofill. During passkey sign-in, the service sends a challenge and your phone, computer or security key proves it holds the matching private credential after you unlock that authenticator with a biometric, PIN or pattern. The private credential is not typed into the website.
Passkeys are designed to resist phishing and eliminate password reuse for that account, but they do not remove every security or recovery risk. Your practical experience depends on whether the service supports passkeys, where the credential is stored, whether it syncs to your other devices and what happens if you lose access to your authenticator.
Passkeys and passwords: the essential difference
A password is a secret string known by you and verified by a service. You enter it into a sign-in page, or a password manager fills it in. If the same password is reused elsewhere, a breach or phishing attack can expose multiple accounts.
A passkey is an authentication credential based on FIDO standards. During registration, the service receives a public key; the corresponding private key remains with an authenticator or an approved credential provider. FIDO describes passkeys as credentials that can be stored on a phone, computer or hardware security key and used with the same device-unlock process you already use, such as biometrics, a PIN or a pattern. FIDO Alliance passkeys overview
#1 Best Overall
- POWERFUL SECURITY KEY: The YubiKey 5C NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5C NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5C NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
The visible unlock prompt is not the passkey itself. Face recognition, a fingerprint, Windows Hello, a device PIN or a pattern authorizes the authenticator to use the private key. The biometric data or PIN is not sent to the website as a replacement password.
| Question | Password | Passkey |
|---|---|---|
| What does the service verify? | A supplied secret, usually text. | A cryptographic proof made with the private key matching the registered public key. |
| What does the user provide? | The password itself, typed or autofilled. | Approval on an enrolled phone, computer or security key. |
| Can a copied value be reused at another site? | Yes, especially when people reuse passwords. | The credential is created for a particular service context and is not a reusable text secret. |
| What happens if the sign-in page is a fake? | You can be tricked into entering the password. | The authenticator is designed to authenticate only the legitimate service context. |
Passkeys do not make every account “unhackable.” Device theft, a compromised credential-provider account, weak recovery methods and insecure fallback sign-ins can still matter.
How passkey sign-in works
1. Registration creates a key pair
When you choose “Create a passkey” in an account’s security settings, the browser and service use WebAuthn to request a new credential. The authenticator generates a private key and a mathematically related public key. The service stores the public key and related account information; the private key stays protected by the authenticator or provider.
Because the service does not receive the private key, a database theft does not expose a text password that can simply be tried on other sites. The exact storage and backup behavior depends on whether the passkey is device-bound or synchronized by a provider.
2. The service sends a challenge
At sign-in, the service sends a fresh, site-specific challenge. The browser passes that request to the authenticator. CTAP supports communication between browsers or operating systems and authenticators, including external security keys. FIDO User Authentication Specifications
3. You authorize the authenticator
Your phone, computer or security key asks for the local action required by its security policy. That might be a fingerprint, face scan, device PIN, pattern or a touch on a hardware key. The authenticator uses the private key to sign the challenge only after this authorization.
4. The service verifies the proof
The service checks the signature with the public key it registered earlier and confirms that the credential is being used for the expected website or app. A successful check proves possession of the private credential without transmitting it to the site.
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Rank #2
- POWERFUL SECURITY KEY: The Security Key C NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key C NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key C NFC via USB-C and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
This exchange is why a passkey is fundamentally different from a password saved in a different-looking field: the website receives a proof generated for that sign-in, not a reusable secret.
Are passkeys safer than passwords?
For the risks that come from password entry, reuse and phishing, passkeys are generally the stronger default. They are designed to bind authentication to the legitimate service context, so a lookalike site cannot simply collect a passkey in the way it collects typed text. Apple’s explanation of passkey security and Microsoft’s passkey guidance describe this phishing-resistant design.
The improvement has boundaries:
- A service must implement passkeys correctly before you can use one.
- An attacker who gains control of your device, credential-provider account or recovery email may still reach the account.
- A password or another fallback method may remain exploitable if the service leaves it enabled.
- Loss of every authenticator can create an access problem unless you have a synchronized copy, another enrolled authenticator or a documented recovery route.
Think of passkeys as reducing a major class of attacks, not as a guarantee that the entire account lifecycle is secure.
Passkeys versus passwords on the decisions that matter
| Decision axis | Passwords | Passkeys | What to do |
|---|---|---|---|
| Phishing | A convincing fake sign-in page can capture the typed secret. | Designed to authenticate only in the legitimate service context. | Prefer a passkey when the account offers one. |
| Reuse and breach impact | Reused passwords can be tested against many accounts. Even a unique password must be protected as a secret. | Each service gets a key-pair credential; the private key is not disclosed as text during sign-in. | Use unique, manager-generated passwords where passkeys are unavailable. |
| Daily convenience | Requires typing or autofill and remembering a secret unless managed. | Usually one local unlock gesture or PIN. | Check that the chosen unlock method is usable for everyone who needs the account. |
| Cross-device access | Possible anywhere you can reach your password manager or remember the password. | Depends on synchronization, cross-device handoff or another enrolled authenticator. | Confirm access on the devices you actually use. |
| Loss and recovery | Usually follows the service’s password-reset process. | Depends on synced copies, backup authenticators and the service’s recovery process. | Set up recovery before removing another sign-in method. |
| Availability | Still supported by most services. | Available only where the service has implemented it, with varying fallback rules. | Keep a viable fallback for accounts that require one. |
Synced and device-bound passkeys
Synced passkeys
A synchronized passkey is made available on more than one device through a platform or third-party credential provider. If you replace a phone, the provider may restore the credential after you sign in to the provider on the new device. This can make everyday access easier and reduce the chance that one lost device locks you out.
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Synchronization introduces a provider dependency. You must protect the provider account, understand its recovery process and verify that it works across your operating systems and browsers. FIDO’s consumer deployment guidance discusses synced passkeys and the decisions involved in provider ecosystems. FIDO synced-passkey deployment guidance, May 31, 2024
Device-bound passkeys
A device-bound passkey remains tied to one authenticator. It can limit where the credential exists and may suit organizations or individuals with strict device-control requirements. The trade-off is operational: losing, resetting or replacing that authenticator can remove your only route unless you registered another one or the service offers recovery.
Neither model is automatically best. Choose according to your threat model, the importance of the account, the devices you carry and your ability to maintain backup access. Enterprise guidance treats synced and device-bound credentials as choices to evaluate against those requirements. FIDO enterprise passkey deployment introduction
Rank #3
- POWERFUL SECURITY KEY: The YubiKey 5 NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5 NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5 NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
Do you need a security key?
No. Most people can begin with a phone or computer that supports passkeys. An external FIDO2 security key is an optional authenticator for people who want a separate physical device, need a key-based workflow or must meet an organization’s policy. FIDO specifies external authenticators that can connect over USB, NFC or Bluetooth Low Energy. FIDO authentication specifications
Before buying a key, verify all of the following:
- The account supports external FIDO credentials, not only platform passkeys.
- Your operating system and browser support the key’s connection method.
- The service allows more than one key or another recovery method.
- The key’s form factor works with the devices where you will sign in.
- You can store a spare key securely if the primary one is lost.
A security key is not a prerequisite for passkeys and is not a substitute for planning recovery.
How to create and use a passkey
Labels differ by service, but the process normally follows this sequence.
- Open the official account settings. Sign in through the service’s real app or by typing its known web address. Look under Security, Sign-in methods, Authentication or Passkeys.
- Choose the passkey option. Common labels include Create a passkey, Add passkey or Set up passwordless sign-in. If the option is missing, the service may not support passkeys for your account, region or administrator policy.
- Review the storage prompt. Note whether the credential will be saved to the device, synchronized by a platform credential manager or handled by another provider. Do not continue until you know how you would reach it on a replacement device.
- Authorize creation locally. Complete the fingerprint, face, PIN, pattern or security-key action requested by your device.
- Name or record the authenticator if asked. A label such as “main phone” or “USB key” helps you identify what to remove later if that device is lost.
- Test a fresh sign-in. Sign out, return to the service’s official sign-in page and choose the passkey option. Confirm that the expected device or provider appears and that the local unlock prompt completes the sign-in.
- Add a second route. Enroll another authenticator or confirm the account’s recovery method before deleting a password or resetting a device.
When to use a passkey
Choose a passkey when all three conditions are true: the service supports it, you can identify where it will be stored, and you have a workable recovery route. This is especially useful for email, financial, work and social accounts that attract phishing attempts or contain information used to reset other accounts.
For a high-value account, enroll a second authenticator if the service permits it. A second phone, computer or external key can be more useful than relying on a single device that may be lost, damaged or wiped.
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Use a password when the service has not implemented passkeys, when a particular device cannot access your passkey provider or when the service’s recovery process requires a password. Generate a long, unique password and store it in a reputable password manager rather than reusing a secret.
Do not treat a password as permanently inferior in every situation. A unique password protected by a manager and combined with an additional authentication factor is a practical fallback while services migrate. The immediate danger is reuse and phishing, not the mere existence of a password.
Rank #4
- POWERFUL SECURITY KEY: The Security Key NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key NFC via USB-A and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
Should you delete your passwords?
Usually, no—not immediately. First verify that the passkey works on every device you need, that another authenticator or recovery method is available and that the service does not require the password for account recovery, API access or a particular older client.
After that check, follow the service’s documented option for disabling password sign-in if it provides one. Some accounts continue to require a password even after adding a passkey; others let an administrator enforce passwordless access. Removing a fallback can reduce attack surface, but it can also make recovery harder if your passkey access fails.
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If the passkey is synchronized
Install or open the same credential provider on a replacement device and complete that provider’s account-recovery process. The passkey may become available after synchronization, but the exact behavior depends on the provider and its protections. Keep the provider account itself secured and maintain its recovery options.
If the passkey is device-bound
Use another authenticator already registered with the service, such as a second computer or security key. If none exists, use the service’s official recovery process. You may need a password, verified email, identity checks or administrator assistance.
If the phone was stolen
Use another trusted device to revoke the lost device or remove its passkey from the account. Change the credential-provider password if the provider account may be exposed, review active sessions and contact the service if you cannot revoke access yourself. A device lock reduces the chance that a thief can authorize the authenticator, but it is not a reason to skip account cleanup.
Recovery planning checklist
- Identify the provider or device that stores each important passkey.
- Register a second authenticator where the service allows it.
- Confirm the service’s password-reset or account-recovery path while you are still signed in.
- Keep a unique password for services that still require one.
- Record which devices are enrolled so you can revoke a lost device quickly.
- For external keys, keep a spare in a separate secure location and test it before an emergency.
- Review recovery email addresses, phone numbers and administrator contacts for accuracy.
Common problems and fixes
The passkey option is missing
Check the service’s official help page and account-security settings. Support may be limited by account type, administrator policy, browser, operating system or region. If no passkey option exists, use a unique password and another supported factor.
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The wrong device appears
Check which credential provider is active, whether synchronization is enabled and whether the browser is signed in to the expected platform account. On a shared computer, select the intended provider explicitly rather than approving an unfamiliar prompt.
Best Value
- FIDO2 & Passkey Ready: Business-ready and FIDO2 L1 certified. This key is supported by major management suites and is ideal for both individual and enterprise deployment. Works seamlessly with Gmail, Facebook, GitHub, Dropbox, Coinbase, and more.
- Universal Connectivity (USB-A ): Features a built-in USB-A connector—simply unfold the key and plug it into your compatible PC or laptop for seamless authentication on the go.
- Dedicated Manager App: Use the Thetis Manager App for the initial hardware PIN setup. Setting the PIN on the device first ensures a smooth registration process. Once the PIN is configured, you can begin registering the key across your favorite FIDO2-compatible online services.
- Ultra-Durable & Portable: Featuring a rotating metal cover, this key is water, crush, and tamper-resistant. It fits easily on a keychain and requires no batteries or network connectivity.
- Check FIDO2 compatibility before purchase - Known limitations: ID Austria is not supported (requires FIDO2 Level 2). Windows Hello login only works with Windows Enterprise editions that support Entra ID, and NFC is NOT supported.
The passkey works on one device but not another
Confirm that both devices use a supported browser and operating system, that the provider is available on both and that the account is synchronized. If the credential is device-bound, enroll the second device separately instead of expecting it to appear automatically.
You cannot complete the biometric prompt
Use the device PIN or another offered unlock method if the authenticator permits it. Make sure the device itself is unlocked and that its local security settings allow passkey use. If accessibility needs make the prompt unsuitable, enroll an authenticator with a more workable interaction.
Recovery asks for a password you no longer have
Do not remove the last working fallback until you have tested recovery. Use the service’s documented reset route or an already registered authenticator. For managed work accounts, contact the administrator rather than creating an unapproved workaround.
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Passkey sign-in normally keeps biometric processing on the local device; the website receives the cryptographic result, not your fingerprint or face image. The exact data handled by a platform or provider is governed by that provider’s design and privacy terms, so review them for accounts with heightened privacy requirements.
Passkeys can reduce typing and help people who struggle to remember complex secrets, but a biometric prompt, small security-key touch area or device PIN may not suit everyone. Offer more than one authenticator or an accessible fallback where possible. Test the complete sign-in and recovery flow with the people who will use the account, not only with the administrator who created it.
What businesses and administrators should decide
Organizations should define whether synchronized credentials are acceptable, which authenticators are approved, how many must be enrolled and how lost devices are revoked. Device-bound credentials can provide tighter control, while synchronized credentials may reduce help-desk lockouts. The decision should reflect the organization’s threat model, device-management capabilities and recovery obligations rather than a blanket preference for one type.
Document the enrollment and recovery process before enforcing passwordless sign-in. Microsoft Entra’s passkey FAQ illustrates that provider behavior and supported scenarios vary, so administrators should verify the exact policies for their tenant and authenticator choices. Microsoft Entra passkey FAQ
A practical decision framework
- Does the service offer passkeys? If not, use a unique password managed securely and any additional factor the service supports.
- Can you reach the passkey on every device you need? Check synchronization, provider support and cross-device sign-in before relying on it.
- What is your recovery route? Enroll another authenticator or verify the service’s recovery process while your current session still works.
- Do you need a separate physical authenticator? Consider a compatible FIDO2 security key only when its hardware workflow solves a real requirement.
- Can you safely remove the password? Remove it only after testing sign-in, recovery and all required clients or integrations.
Bottom line: which should you choose?
Passkeys are the better default wherever they are supported and recoverable. Their public-key design prevents the site from receiving a reusable secret and is built to resist phishing. Passwords remain necessary for unsupported services and as carefully managed fallbacks. The safest migration is gradual: create the passkey, verify where it is stored, enroll backup access, test recovery and only then decide whether the service’s password can be disabled.
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