Biometric Door Lock Buying Guide: Fingerprint, Card, and Camera Access Explained

Biometric door locks store a fingerprint template, card credential, or face scan, then unlock when the live scan matches — no keys or codes required.

Keys get copied, lost, and lent out. A biometric lock remembers specific people and can tell you who arrived and when, which is why these locks have moved into front doors. What matters before buying: how each method authenticates you, where each fails, and the monthly bill.

How Fingerprint, Card, And Camera Locks Work

Fingerprint locks convert your print into a mathematical template matched against credentials stored in the lock’s memory. That template is data, not a photo, and a good lock never uploads it to the cloud. The trade-off: dry, cracked fingertips from winter weather or manual work read poorly, and FIPS fingerprint sensors are designed to be re-enrolled for a different person, not borrowed.

Card and fob access uses the same proximity technology as an office badge — fastest when hands are full, easiest to hand to a dog walker or contractor. But a lost card is a lost credential, so card systems live or die by how quickly you can delete that card from the app.

Camera locks add visual confirmation. Avigilon’s explainer on biometric access control describes how these systems use 2D or 3D face images for authentication, and a 3D scan resists a printed photo far better than 2D. Expect camera locks to cost more, draw more power, and raise more privacy questions than fingerprint-only models.

eufy’s Video Smart Lock Line

It bundles fingerprint, app, voice, keypad, and physical key entry, records locally, and skips any monthly fee — eufy stores footage on the device instead of charging you to watch it.

PCMag’s review of the eufy Video Smart Lock covers installation, the app, and daily unlocking — worth reading, because a lock that frustrates you at 7 a.m. gets ripped out fast.

Once you’ve picked an access method, our tested roundup of the best biometric door locks walks through the models that held up.

What Decides Whether A Biometric Lock Is Worth Buying

Four questions settle it: does the lock work when the battery dies, who can you delete access for without rekeying, where does the video go, and does anything require a subscription?

• Battery and fallback: check for a physical key or backup power point. A dead lock that strands you outside is the failure everyone underestimates.
• Credential management: the app should add and remove fingerprints and cards in seconds, not minutes.
• Local versus cloud storage: local recording means no recurring fee and footage that stays in your house. Cloud means easier remote viewing and someone else’s server holding your video.
• Gate to name: if your door frame is metal or Wi-Fi barely reaches the porch, smart features may fail where the mechanical lock wouldn’t. Test connectivity at the door before buying.

On shared or rental doors, confirm the lock replaces the existing deadbolt without new drilling. Most video locks follow the standard deadbolt footprint, but not all.

Frequently Asked Questions

Can a fingerprint lock be fooled?

Sensors verify the live finger against a stored template rather than comparing pictures, so lifted prints are hard to use. The realistic failure is the reverse: your own finger failing to read on a cold, dry morning.

Do biometric locks need Wi-Fi?

No. Fingerprint and keypad unlocking works entirely offline inside the lock. Wi-Fi is only needed for remote app access, live video, and notifications — so a lock can still open your door during an internet outage.

What happens when the battery dies?

Most video locks warn you in the app and on the lock itself well before the battery is spent. Keep a physical key stored somewhere other than inside the house, and check whether the model accepts a temporary power source.