Aadhaar Validator

Validate an Aadhaar number format using the Verhoeff checksum algorithm.

Enter 12-digit Aadhaar Number

0/12 digits entered

Disclaimer: This tool only validates the Aadhaar number format using the Verhoeff checksum algorithm. It does NOT verify whether the number is actually issued by UIDAI or linked to a real person. For official verification, visit the UIDAI website.

About the Verhoeff Algorithm

The Verhoeff algorithm is a checksum formula for error detection developed by Jacobus Verhoeff in 1969. Unlike simpler checksum methods, it detects all single-digit errors and all adjacent transposition errors. Aadhaar, India's 12-digit unique identity number, uses this algorithm — the last digit is a Verhoeff checksum computed from the first 11 digits.