the best hardware security keys for 2FA in 2025

If you still use SMS codes or authenticator apps for two-factor authentication, you're safer than someone with no 2FA at all — but you're still vulnerable to phishing. A hardware security key fixes that.

Here's why: a hardware key uses the possession factor — you physically own the device that signs the authentication request. No one can trick you into typing a code on a fake login page because the key won't sign for the wrong domain.2 That's the core promise of FIDO2 and WebAuthn, and it's why security keys are considered phishing-proof.

We've gathered the best options for different needs, from advanced users to people who just want a simple, affordable second factor.

1. YubiKey 5 NFC — best overall / advanced

Best for: anyone who wants the widest protocol support, including FIDO2, U2F, OTP, PGP, and Smart Card.

The YubiKey 5 series is the industry standard for a reason. It supports more authentication protocols than any competitor — FIDO2/WebAuthn, FIDO U2F, one-time passwords (OTP), PGP signing, and Smart Card (PIV) functionality.1 If you're a developer, security professional, or just someone who wants a single key that works everywhere, this is it.

It comes in USB-A and USB-C variants, with or without NFC for mobile use. The NFC version lets you tap your phone for authentication on iOS and Android.

Trade-off: It's more expensive than simpler keys, and most people won't use the advanced PGP or Smart Card features.

Check price on Yubico

2. Yubico Security Key C NFC — best budget / simple

Best for: anyone who wants a no-fuss, affordable hardware key that just works.

If you don't need OTP or PGP, the Yubico Security Key C NFC is the smarter buy. It's the same hardware quality as the YubiKey 5 but limited to FIDO2/WebAuthn and U2F — which is exactly what most websites and services support.1

Wirecutter calls it the best choice because it's affordable and works with "just about every site that supports security keys."1 It's also available with USB-C or USB-A, and the NFC variant works with phones.

Trade-off: No OTP or PGP support. If you ever need those, you'll have to upgrade.

3. Google Titan Security Key — best for passkey storage

Best for: people deep in the Google ecosystem who want onboard passkey storage.

The redesigned Google Titan Security Key supports FIDO2 and FIDO U2F, and it can store up to 250 passkeys onboard.3 That's a big deal as passkeys (the passwordless replacement for passwords) become more common across Google, Apple, and Microsoft platforms.

It comes as a bundle with both USB-A and USB-C connectors, plus Bluetooth for devices without USB ports. The build quality is solid, and it integrates tightly with Google's Advanced Protection Program.

Trade-off: Bluetooth adds complexity and a battery requirement. If you don't need passkey storage, the simpler Yubico Security Key is a better value.

4. Google Authenticator — best free software alternative

Best for: sites that don't support hardware security keys yet.

Not every service supports FIDO2 or WebAuthn. For those, Google Authenticator is the reliable, free fallback. It generates time-based one-time passwords (TOTP) on your phone — no internet connection required.

It's not phishing-proof (a fake site can still ask for your code and forward it), but it's far better than SMS. Use it as a secondary factor for accounts that don't accept hardware keys, and pair it with a hardware key everywhere else.

Trade-off: No phishing resistance. No cloud backup by default (you need to manually transfer accounts between devices).

comparison at a glance

why you need a hardware key (and a backup)

The single biggest threat to online accounts isn't a weak password — it's phishing. SMS codes can be intercepted via SIM-swapping. Authenticator app codes can be stolen by a convincing fake login page. Hardware keys prevent both because the cryptographic challenge is tied to the domain you're actually visiting.2

Always buy two keys. Register both with every service that supports them. Keep one on your keychain and one in a safe place. If you lose your primary key, the backup is your only way back in without going through account recovery (which can take days).

the bottom line

• Get the YubiKey 5 NFC if you want the most capable key on the market.
• Get the Yubico Security Key C NFC if you want a simple, affordable key that covers 90% of use cases.
• Get the Google Titan if you're all-in on passkeys and the Google ecosystem.
• Keep Google Authenticator as a free fallback for sites that don't support hardware keys.

Disclosure: AskBuy earns a commission if you purchase through the links above. This doesn't affect our recommendations — we only recommend what we'd use ourselves.