How to Lock Your Aadhaar Biometrics, and What Still Works After
An OTP-backed biometric lock stops anyone using your fingerprint on your Aadhaar. How to switch it on, unlock it when needed, and what it leaves alone.
You can lock your Aadhaar biometrics on UIDAI's myAadhaar portal or the official Aadhaar app using a one-time password (OTP) sent to your registered mobile number. Once the lock is on, nobody can use your fingerprint, iris or face to authenticate against your Aadhaar number, which closes the door on the cloned-fingerprint withdrawals that the Home Ministry's cybercrime coordination centre warned states about in 2023. According to reporting on the lock, OTP-based Aadhaar verification, UPI, net banking and card payments keep working as normal.
- What happens when biometrics are locked?
- Why bother locking them?
- How do I lock my Aadhaar biometrics?
- How do I unlock biometrics when a counter needs them?
- Is the Aadhaar lock the same as the biometric lock?
- How do I know if someone has used my Aadhaar?
What happens when biometrics are locked?
UIDAI describes the biometric lock as a service that lets an Aadhaar holder lock and temporarily unlock their biometrics. It covers fingerprints, iris and face. While it is on, no entity can run a biometric Aadhaar authentication on your number, and any service that tries gets error code 330, which means the biometrics are locked. The lock stays on until you either unlock it temporarily or disable the locking system altogether.
What it leaves alone matters just as much, according to published explainers on the lock:
- OTP-based Aadhaar verification still works.
- UPI payments are not affected.
- Net banking and debit or credit card payments carry on as before.
Why bother locking them?
The Aadhaar Enabled Payment System (AePS) lets someone withdraw cash or transfer funds with nothing more than an Aadhaar number and a fingerprint. In February 2023 the Indian Cyber Crime Coordination Centre (I4C) warned states that criminals were downloading fingerprints from property documents uploaded to state registry websites, cloning them and using the copies for AePS withdrawals, and asked states to mask fingerprints on documents they publish. I4C data later showed biometric cloning and AePS frauds made up 11% of cyber-enabled financial crimes in 2023, and I4C's chief said most AePS frauds originated in parts of Jharkhand and Bihar.
That is a long way from Kochi, but a cloned fingerprint does not care which state its owner lives in. The lock costs nothing and takes a few taps, so our view is simple: switch it on, and leave it on.
How do I lock my Aadhaar biometrics?
You need a mobile number registered with Aadhaar, because every lock and unlock is confirmed by OTP. If your number is not registered, sort that out first at an Aadhaar centre; our guide to Aadhaar enrolment and updates in Kochi covers where to go.
| Route | What you do |
|---|---|
| myAadhaar portal | Log in with your Aadhaar number and OTP, open the Lock / Unlock Biometrics service, confirm with the OTP sent to your registered mobile and switch the lock on. |
| Aadhaar app | Set up the app (language, Aadhaar number, SIM selection, face authentication and a 6-digit PIN), then use its one-click biometric lock and unlock. |
| No registered mobile | Visit an Aadhaar enrolment centre or Aadhaar Seva Kendra. |
UIDAI replaced the older mAadhaar app with the new Aadhaar app at the start of July 2026, so if mAadhaar is still on your phone, install the new app instead rather than hunting for the menu in the old one.
How do I unlock biometrics when a counter needs them?
Use the same portal or app, confirm with an OTP and choose a temporary unlock. The unlock is temporary; banking and tax guides say it lasts about 10 minutes before the lock switches itself back on, so unlock just before you reach any counter that asks for your fingerprint against Aadhaar, not the night before. It is a small irritation, and that small irritation is exactly what stops a stranger at a micro-ATM in another state.
Is the Aadhaar lock the same as the biometric lock?
No. The Aadhaar (UID) lock is the heavier option: it blocks every kind of authentication using your Aadhaar number, including biometric, demographic and OTP. To use it you need a 16-digit Virtual ID (VID), which you can generate on myAadhaar or by texting GVID followed by the last 4 or 8 digits of your Aadhaar to 1947, and you unlock with your latest VID. For most people the biometric lock is the right balance; the full UID lock suits someone who rarely uses Aadhaar at all.
How do I know if someone has used my Aadhaar?
UIDAI emails your registered address every time it receives a biometric or OTP authentication request, and the Aadhaar app has an authentication history screen. If you see a request you did not make:
- Call the UIDAI helpline on 1947 or write to help@uidai.gov.in.
- If money has left your account, call 1930 straight away and file a complaint on cybercrime.gov.in under financial fraud. Our step-by-step on what to do after cyber fraud in Ernakulam explains the first hour.
The same habits protect you against the other scams doing the rounds; our explainer on how to spot a digital arrest scam is worth ten minutes. More plain-language safety guides live in Tech & AI.
Written By
Haila Kochi Editorial Team
Part of the Haila Kochi editorial team, covering the food, business, lifestyle, and people that make Kochi what it is.
