An Aadhaar number is always 12 digits and never starts with 0 or 1. Type a number above to test it against the official structure and generate a safely masked copy showing only the last 4 digits. This is an information guide only — it cannot verify whether any number is a real Aadhaar.
What is the structure of an Aadhaar number?
Aadhaar is a 12-digit unique identity number issued by the Unique Identification Authority of India (UIDAI). Unlike some national ID numbers, an Aadhaar number encodes nothing about you: it does not contain your birth date, gender, or region. It is a random number drawn from a pool, with one structural rule — the first digit is never 0 or 1. So a 12-digit number starting with 0 or 1 cannot be a genuine Aadhaar, while one starting with 2–9 is at least structurally possible.
The number is printed in groups of four (XXXX XXXX XXXX) purely for readability, and UIDAI also issues a 16-digit Virtual ID (VID) that you can use instead of your Aadhaar number for authentication, so the real number stays hidden. Keep in mind that many older documents repeat common myths — there is no publicly documented checksum or digit-meaning scheme for Aadhaar, and any website claiming to “decode” your Aadhaar digits is inventing it.
Why should I mask my Aadhaar number?
Your Aadhaar number, combined with a fingerprint or OTP, can authenticate you — which makes a full, unmasked copy valuable to fraudsters. UIDAI itself recommends sharing only masked Aadhaar (showing just the last 4 digits, e.g. XXXX XXXX 1234) wherever the full number is not legally required: job applications, rental agreements, hotel check-ins, and casual photocopy requests. Masking is not paranoia; it is the officially recommended default.
You can download an officially masked e-Aadhaar from UIDAI’s portals, which prints the masked number with a digital signature — far more trustworthy than blacking out digits with a marker yourself. For everyday copies, the masking demo above produces the same XXXX XXXX 1234 presentation.
How do I mask an Aadhaar number?
Enter the 12 digits above and the tool replaces the first eight with X’s, leaving the last four visible. That is exactly the format UIDAI uses for masked Aadhaar. When you photocopy an Aadhaar card, write the purpose and date across the copy in your own handwriting (“for rental agreement, 8 Oct 2026”) — a classic, low-tech defence against the copy being reused elsewhere.
Does this tool verify Aadhaar numbers?
No. Nothing on this page can tell you whether a number is a real, issued Aadhaar or who it belongs to — and any site that claims to do that without UIDAI authorisation is lying. Genuine verification only happens through UIDAI’s own channels: the “Verify Aadhaar Number” facility on UIDAI’s official portal, authorised Authentication User Agencies (banks, telecom operators doing e-KYC), and the mAadhaar app. If someone asks you to “verify” an Aadhaar on an unknown website, refuse.
Where is Aadhaar used?
Aadhaar is the backbone of Indian identity verification: opening bank accounts, getting a SIM card, filing taxes (it must be linked with PAN), receiving LPG subsidy and other direct benefit transfers, and e-KYC for mutual funds and brokerages. Because it is so widely used, UIDAI allows you to lock your biometrics through its portal or the mAadhaar app, so the number alone cannot be abused for biometric authentication — a step worth taking if you rarely use fingerprint authentication.
What are this guide’s limitations?
The structural check (12 digits, first digit 2–9) is necessary but not sufficient: it filters out obvious fakes but cannot confirm a real Aadhaar, detect a deactivated number, or identify the holder. Rules and recommended practices change — UIDAI updates its guidance periodically, so treat this page as a starting point and confirm anything consequential on UIDAI’s official channels. And never publish your full Aadhaar number online, including in screenshots of this page’s demo: use a sample number if you are just experimenting.
Frequently asked questions
How many digits are in an Aadhaar number?
Twelve. It is printed as three groups of four digits (XXXX XXXX XXXX). A genuine Aadhaar never starts with 0 or 1 — the first digit is always 2–9.
What is masked Aadhaar?
A version of your Aadhaar showing only the last 4 digits (XXXX XXXX 1234), recommended by UIDAI for everyday sharing. You can download an officially masked e-Aadhaar from UIDAI's portals.
Can this page check if my Aadhaar is valid?
No. It only checks the number's structure. Real verification happens through UIDAI's official ‘Verify Aadhaar Number’ facility or authorised e-KYC providers.
Does the Aadhaar number contain my date of birth?
No. The 12 digits encode no personal information — no birth date, gender or region. It is effectively a random identifier.
What is a Virtual ID (VID)?
A temporary 16-digit number linked to your Aadhaar that you can use for authentication instead of revealing your actual Aadhaar number. You can generate one through UIDAI's portal or the mAadhaar app.
Is my Aadhaar data stored on this site?
No. The masking demo runs entirely in your browser; nothing you type is sent to any server or stored. Still, use a sample number when experimenting.