Generate random valid-format Aadhaar Number numbers for testing
Paste a Aadhaar Number below to check whether it has a valid format and correct checksum.
Aadhaar (meaning "foundation" in Sanskrit) is a 12-digit unique identity number issued by the Unique Identification Authority of India (UIDAI) to residents of India. Launched in 2009, it is the world's largest biometric identity system, linking fingerprint, iris, and photograph data to a single number. Aadhaar is used for opening bank accounts, filing taxes, receiving government subsidies under the Direct Benefit Transfer scheme, and accessing a growing range of digital services.
An Aadhaar number is a 12-digit string with no embedded demographic information โ unlike China's Resident ID, it does not encode birth date, gender, or location. The first digit is always between 2 and 9 (0 and 1 are reserved and never assigned). Numbers are typically displayed in three groups of four digits (XXXX XXXX XXXX) for readability. A Masked Aadhaar, where only the last four digits are visible, is the approved form for use when full disclosure is unnecessary.
The 12th digit of every Aadhaar number is a Verhoeff check digit, computed using the algorithm developed by Jacobus Verhoeff in 1969. It applies three mathematical tables โ a multiplication table based on the dihedral group D5, a permutation table, and an inverse table โ iteratively over the digits in reverse order. The Verhoeff algorithm detects all single-digit errors and all adjacent transposition errors, making it significantly more robust than simple modulo-based checksums used in most other national IDs.
Indian fintech, healthtech, and government services increasingly rely on Aadhaar-based e-KYC and authentication APIs. Developers building these integrations need valid-format Aadhaar numbers to test input fields, masking behavior (displaying XXXX XXXX 1234), QR code parsing, and API request schemas. Because real Aadhaar numbers are sensitive personal data protected under India's Aadhaar Act and the PDPB, using randomly generated but structurally valid fake numbers is both the safe and legally compliant approach.
The Aadhaar ecosystem underpins India's digital public infrastructure, including UPI payments, DigiLocker document storage, PMJAY health insurance, and the CoWIN vaccination platform. Developers integrating with these services need to simulate Aadhaar flows in staging environments. A fake Aadhaar number with a correct Verhoeff checksum can pass client-side validation libraries, enabling thorough integration testing across the entire India Stack without exposing real citizen identifiers.