The decision in brief
Security key types differ on how they connect, how they confirm you, how many you keep, and how well they handle wear. Start with the port your devices already have, because that choice narrows everything else. Then decide between a biometric model and a touch-only model. Last, plan a spare, since an account can lock you out if its only key is lost. Work through the checks below in that order.
Connector type
The connector types on a security key decide whether it fits your devices without an adapter. A USB-C plug suits newer laptops and many phones. A USB-A plug suits older desktops and laptops that still use the classic rectangular port. Some keys also use NFC, or near-field communication, a short-range wireless link that works when you tap the key against a supported phone.
A key with several connectors covers more devices, but extra connectors only help if you use each kind of device. In the provider's product details, look for the exact connector list and whether NFC is included. The details vary by model, so check them for each key you consider.
Biometric or touch-only
A biometric sensor reads a fingerprint before the key confirms your sign-in. Touch-only keys ask you to press a button or touch a metal contact instead. A biometric model adds a check that is hard for anyone else to pass, which suits shared desks and devices that others might borrow. Touch-only keys have fewer parts that could wear out, which many people prefer for simple daily use.
A biometric key needs you to enrol a fingerprint first, using a computer or phone, and the fingerprint data then stays on the key itself. If the sensor struggles with a worn or injured finger, you need a backup method. In the provider's documentation, look for how the fingerprint is stored, whether the key still works without it, and what happens if the sensor fails.
How many to buy
Most people benefit from keeping a spare key. An account that depends on a key for sign-in can lock you out if that key is lost or breaks. A spare kept somewhere separate gives you another way in, provided it was registered ahead of time.
Plan the spare before you need it. Register each key with every account that accepts it, then store the spare apart from the main key. Many accounts also let you remove a lost key from their settings, so check that option too. The security key comparison board brings providers together, and each provider's documentation is the place to confirm what it supports.
Durability
A key lives on a keyring or in a bag, so it meets dust, pressure and the occasional drop. Look for a housing that resists cracking and a connector that will not bend easily. Metal bodies can resist wear better than thin plastic, though weight and size matter too.
Some keys add a cover that protects the connector from dirt and scratches. Water and dust resistance are worth checking if the key stays on a bag or a keychain outdoors. In the provider's documentation, look for the construction and any protection against water or dust. Treat those as the provider's own claims rather than a promise that the key will survive every knock.
Who should pick what
Match your situation to the type that fits it.
- Readers with newer laptops and phones: a USB-C key with NFC covers both sets of devices.
- Readers who keep an older desktop: a USB-A key fits the port without an adapter.
- Readers who share a computer: a biometric key adds a check that is hard for anyone but the owner to pass.
- Readers who want simple daily use: a touch-only key with a sturdy body is a practical choice.
- Readers protecting important accounts: a main key, a registered spare, and storage in separate places.
Common questions
- Keys without NFC: will they still work? Yes, on any computer with a matching port, so NFC is optional for many setups.
- Passkeys: do accounts accept them with a key? Many do, and a passkey can sometimes be stored on a key. The passkeys entry covers how that works.
- Losing a key: how do you stay signed in? A registered spare keeps an account reachable while a replacement is ordered. Remove the lost key from each account as soon as you can.
- Checking support: where do you confirm the key types an account accepts? Its security settings name the accepted types, and that is the final word.
- Choosing without a biometric sensor: is it a sound choice? Yes, a touch-only key protects most personal accounts well.