Millions of people can now log in to government services using just their face or fingerprint.
This follows the launch of a new passkey feature on the GOV.UK One Login system, which allows users to sign in using a fingerprint, Face ID, or PIN.
The Government said the feature is designed to be faster and more secure than traditional passwords.
Stephanie Peacock, digital government minister, said: "Nobody enjoys hunting for a forgotten password or waiting for a text message code just to check their tax return or renew a document.
"Passkeys mean people can access the services they rely on in seconds, using the same face or fingerprint scan they already use to unlock their phone.
"This is about making government services safer and simpler for everyone, while giving people stronger protection against the fraudsters who target passwords."
The Government said the feature will help protect more than 23 million users from phishing and cyber threats by removing the need for passwords, which can be stolen through fake websites or scam emails.
Passkeys are tied to specific devices and cannot be reused or guessed.
More than 300,000 people have already switched to using passkeys during an initial trial.
The option is now being rolled out to millions of GOV.UK One Login users.
The feature is optional, and users can continue to log in with a password if they prefer.
However, the Government said passkey logins are eight times faster than the traditional sign-in process, which requires a username, password, and two-step verification code.
The passkey system can be used to access a wide range of government services, including tax management, childcare support, state pension checks, and driving licence renewals.
Jonathon Ellison, NCSC Director for National Resilience, said: "The introduction of passkeys for GOV.UK One Login will give users a simpler, faster, and more secure way to sign in to many public-facing government services while leaving password headaches behind.
"Cyber criminals often look for the easiest route to access important accounts, which means login details remain a common target.
"But passkeys offer a highly phishing-resistant alternative to passwords, frustrating attackers and saving the public time.
"We strongly encourage users to set up a passkey for GOV.UK One Login and to do so wherever passkeys are available across digital services.
"By taking this small but significant step, you can help protect your online accounts and raise our collective resilience, making the UK safer."
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