# Passkeys vs FIDO2 Security Keys: What's the Difference?

> Passkeys and FIDO2 hardware security keys are both WebAuthn credentials, but they differ in portability, assurance and where they belong. A clear comparison and when to use each.

Source: https://playciso.com/blog/passkeys-vs-fido2-security-keys · Published: 2026-09-26 · Publisher: PlayCISO (https://playciso.com)

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"Should we use passkeys or FIDO2 security keys?" is one of the most common identity questions right now, and it is slightly the wrong question — because they are not different standards. Both are FIDO2/WebAuthn credentials. Both authenticate you by proving you control a private key that is cryptographically bound to a specific website origin, which is exactly the property that makes both of them phishing-resistant. What actually differs is portability and assurance. ## The one thing they share (and why it matters) A FIDO2/WebAuthn credential — whether you call it a passkey or a security key — will only release for the origin it was registered with. Lure a user to a lookalike domain and the browser simply will not produce the credential. There is no code to read out, no push to approve, nothing for an adversary-in-the-middle kit to relay. That origin binding is the whole game, and both forms have it. ## Where they differ Synced passkeysHardware security keys FormSoftware credential in a cloud keychainPhysical token (USB/NFC/Bluetooth) PortabilitySyncs across the user's devicesDevice-bound; does not sync AssuranceStrong; also depends on the cloud accountHighest; key never leaves the device Best forGeneral workforce, consumers, broad adoptionAdministrators, privileged and high-risk roles Cost / logisticsEffectively free; no hardware to shipPer-key cost; provisioning and spares ## How to choose - Everyone gets passkeys. They are the adoption engine: no hardware to ship, they sync, and they are dramatically more phishing-resistant than passwords or OTP. - Privileged accounts get hardware keys. For administrators and anyone who can move money, change infrastructure or access crown-jewel data, the device-bound guarantee of a hardware key is worth the logistics. - Register two per user. A platform passkey plus a roaming key removes the lockout problem and is itself a resilience control. - Kill the fallback. Neither form helps if a phishable SMS/OTP path is still enabled on the same account. ## The short answer It is not passkeys versus keys — it is passkeys for the many, hardware keys for the few, both under one FIDO2/WebAuthn programme. For compliance-driven rollouts see [FIDO2 for NIS2](/blog/fido2-nis2-compliance) and [FIDO2 for DORA](/blog/fido2-dora-compliance), and the full [options assessment](/blog/fido2-passkeys-benefits-options-assessment). Quantify where weak authentication sits today with the free [Identity Risk tool →](/tools/identity-risk) ## Frequently asked questions **Are passkeys and FIDO2 keys the same?** They are two forms of the same FIDO2/WebAuthn standard — both origin-bound and phishing-resistant. Passkeys usually sync via a cloud keychain; hardware keys are device-bound and do not sync. **Which is more secure?** Hardware keys give the highest, device-bound assurance (ideal for admins); synced passkeys are strongly phishing-resistant and best for broad adoption. **Can we use both?** Yes — passkeys for the workforce, hardware keys for privileged accounts, two authenticators per user. **Do device-bound passkeys exist?** Yes — a passkey can be device-bound or synced; whether it syncs is a separate, often policy-controlled property.