How to Lock Your Aadhaar Biometrics and Check Who Used Your Aadhaar

A neighbour of ours runs a small grocery shop. One day he noticed small withdrawals from his bank account that he never made – no OTP, no card used. It turned out someone had misused his fingerprint data through an Aadhaar-based payment system.

That story made me check my own Aadhaar settings, and I realised how few people know about two simple, free tools from UIDAI: biometric locking and authentication history. Both take a few minutes. Here’s how to use them – through official channels only.

Quick note: UIDAI updates its portal and app layout from time to time. If a button has moved, look for the same option name, and always check uidai.gov.in for current steps.

Why Lock Your Biometrics?

Your Aadhaar biometrics – fingerprints and iris – can be used to verify your identity for things like bank KYC, SIM verification, and AePS (Aadhaar Enabled Payment System), which lets people withdraw cash using just their Aadhaar number and fingerprint at banking correspondent points.

AePS is genuinely useful, especially in rural areas. But if someone gets your Aadhaar number and manages to fake your fingerprint (for example, from a fingerprint copied off a document or a property registration paper), they could try to misuse it.

Locking your biometrics means nobody – including you – can use your fingerprint or iris for Aadhaar authentication until you unlock it. Your Aadhaar still works for OTP-based verification and as an ID document.

Before You Start

You’ll need:

• Your Aadhaar number (or Virtual ID).
• Access to the mobile number linked to your Aadhaar – you’ll receive OTPs on it.

If your mobile number isn’t linked or is outdated, you’ll need to update it at an Aadhaar Seva Kendra or authorised enrolment/update centre first. This can’t be done fully online.

How to Lock Biometrics on the myAadhaar Portal

1. Go to the official site myaadhaar.uidai.gov.in (type it yourself; don’t click links from SMS).
2. Click Login and enter your Aadhaar number and the captcha.
3. Enter the OTP sent to your registered mobile.
4. Look for Lock/Unlock Biometrics in the services list.
5. Read the note, tick the checkbox, and choose to lock.
6. Confirm. You should see a success message.

That’s it. Your biometrics are now locked.

How to Lock Biometrics Using the mAadhaar App

1. Download mAadhaar from the Play Store or App Store. Check that the developer is UIDAI (Unique Identification Authority of India).
2. Register your Aadhaar profile with OTP verification.
3. In the app, look for Biometric Lock (or a similar option under My Aadhaar / Services).
4. Enable it and confirm with OTP.

UIDAI has also been rolling out a newer Aadhaar app; if you see an updated official app, check its settings for the same lock option.

What Happens When You Need Your Fingerprint?

Sometimes you’ll need biometric authentication – a new SIM card, bank KYC, or a government service.

You can temporarily unlock biometrics from the portal or app. Typically, the unlock is for a short window, after which biometrics lock again automatically. You can also choose to disable the lock completely if you prefer.

Practical tip: if you’re going to a bank or mobile store for KYC, unlock just before you reach the counter.

How to Check Your Aadhaar Authentication History

This shows you when and how your Aadhaar was used for authentication – biometric, OTP or demographic – and by which agency (bank, telecom, etc.).

On the myAadhaar portal

1. Log in to myaadhaar.uidai.gov.in with OTP.
2. Find Authentication History.
3. Choose the authentication type (All, Biometric, OTP, etc.) and a date range.
4. View the list.

On the mAadhaar app

Look for Authentication History in the app’s services and follow the same steps.

What to look for

• Dates and times you don’t recognise.
• Agencies you’ve never dealt with.
• Biometric authentications when you didn’t give your fingerprint anywhere.

If you see something suspicious, act quickly (see below).

Lock Your Aadhaar Number Itself (Optional, Stronger)

UIDAI also offers an Aadhaar Lock (sometimes called UID lock). When locked, your Aadhaar number can’t be used for authentication at all. You’d use a Virtual ID (VID) – a temporary 16-digit number linked to your Aadhaar – instead, where VID is accepted.

To do this:
1. Generate a Virtual ID first from the myAadhaar portal or mAadhaar app.
2. Then use the Lock/Unlock Aadhaar option and follow the steps.

This is stronger, but less convenient. Many people find biometric lock enough. If you do lock your Aadhaar, keep your VID details safe – you’ll need them to unlock. Check the current process on uidai.gov.in before you do this.

Use Masked Aadhaar for Sharing

Every hotel, gym, and housing society wants a copy of your Aadhaar. You don’t always need to give the full number.

A Masked Aadhaar shows only the last four digits of your Aadhaar number. You can download it from the myAadhaar portal:

1. Log in → Download Aadhaar.
2. Choose Masked Aadhaar option.
3. Download the PDF. It’s password-protected – the password format is explained on the download page (typically based on your name and birth year).

Use masked Aadhaar wherever the full number isn’t legally required. Some places, like for certain government benefits, may still need the full number.

Also: when giving a photocopy, write the purpose and date across it – “For KYC at XYZ only, 06/10/2026”. It discourages misuse.

If You Spot Misuse

1. Lock your biometrics immediately if you haven’t already.
2. Contact UIDAI: call the toll-free helpline 1947, or email help@uidai.gov.in. You can also raise a grievance on the UIDAI website.
3. If money was taken, call your bank immediately using the official number, and report to the cybercrime helpline 1930 or cybercrime.gov.in.
4. Keep screenshots of the authentication history entries.

Common Questions People Have

“Will locking biometrics stop my ration or pension?”
If those services use your fingerprint for verification, you’ll need to unlock biometrics temporarily when you go. Plan ahead.

“Can I lock biometrics without a linked mobile number?”
No, OTP to the registered mobile is required. Update your mobile number at an Aadhaar centre first.

“Will banks still work normally?”
Yes. Net banking, UPI, cards and cheques have nothing to do with Aadhaar biometrics. Only fingerprint-based Aadhaar authentication is affected.

Safety Reminders

• UIDAI won’t call you asking for your OTP. Never share it.
• Only use uidai.gov.in and myaadhaar.uidai.gov.in, and the official UIDAI apps.
• Be careful where you leave Aadhaar photocopies. Shred old ones.
• Avoid uploading Aadhaar to random apps or chatbots.

A Simple Routine I Follow

To keep this low-effort, here’s what I do:

1. Biometrics stay locked by default. I unlock only when a bank, telecom store or government office actually needs my fingerprint.
2. Every couple of months, I log in to the myAadhaar portal and glance at the authentication history. It takes two minutes.
3. I share masked Aadhaar with hotels, gyms and societies, unless they genuinely need the full number.
4. I’ve helped my parents do the same, because they’re more likely to be targeted by fraud calls and AePS misuse.

It’s not complicated. The main thing is just doing it once and making the check a habit.

FAQ

Is locking Aadhaar biometrics free?
Yes, it’s free through the myAadhaar portal and official app.

Can I still use Aadhaar OTP after locking biometrics?
Yes. Biometric lock only blocks fingerprint and iris authentication.

How far back does Aadhaar authentication history go?
The portal shows a limited period of past records. Check the date range options on the portal for the current limit.

What is the UIDAI helpline number?
1947 (toll-free). You can also email help@uidai.gov.in.