Format Validation Only: This tool ONLY checks if the Aadhaar number format is mathematically valid using the Verhoeff algorithm.
Not Official Verification: This does NOT verify if the Aadhaar number actually exists or belongs to any person.
No Data Storage: No data is stored, saved, or transmitted. All validation happens locally in your browser.
Official Verification: For official Aadhaar verification, please visit UIDAI Official Portal
Privacy & Security
This tool performs mathematical validation using Verhoeff algorithm. No data is stored or transmitted. All processing happens locally in your browser.
Aadhaar Format Guide
1234 5678 9012
Format Requirements:
• Total 12 digits (no alphabets or special characters)
• First digit cannot be 0 or 1
• Last digit is checksum calculated using Verhoeff algorithm
• Can be entered with or without spaces
• Example valid format: 234567890123
Format validation only. For official verification, visit UIDAI Portal
How to Use
1
Enter Aadhaar Number
Type the 12-digit Aadhaar number in the input field
2
Click Validate
Press the Validate Format button to check the number
3
View Result
See if format is valid or invalid with explanation
4
Verify Officially
Visit UIDAI portal for official verification
Features
Instant Results
Validate in milliseconds
100% Private
All processing in browser
Verhoeff Algorithm
Mathematical checksum
Mobile Friendly
Works on all devices
Unlimited Checks
No limits, free forever
Verhoeff Algorithm
Purpose: Detects single-digit errors and transpositions
Used by: UIDAI for Aadhaar checksum
How it works: Last digit is calculated from first 11 digits
Detection rate: 100% for single errors, 98% for transpositions
Why Use Our Aadhaar Validator?
Instant Validation
Get format validation in milliseconds
100% Private
All processing in your browser
Verhoeff Algorithm
Mathematical checksum validation
Any Device
Works perfectly on all devices
Frequently Asked Questions
What is Aadhaar?
Aadhaar is a 12-digit unique identity number issued by UIDAI to Indian residents based on their biometric and demographic data.
How does the validation work?
Our tool uses the Verhoeff algorithm to check if the last digit (checksum) matches the first 11 digits, ensuring the number format is mathematically valid.
Can I verify if Aadhaar exists?
No, this tool only validates format. For official verification, you must visit the UIDAI portal with OTP authentication.
Is my data safe?
Yes! All validation happens in your browser. No data is stored, saved, or transmitted to any server.
What is Verhoeff algorithm?
Verhoeff algorithm is a checksum formula for error detection. It can detect all single-digit errors and most transposition errors.
Why first digit can't be 0 or 1?
As per UIDAI specifications, Aadhaar numbers cannot start with 0 or 1. This is part of the official format requirements.
How to verify Aadhaar officially?
Visit myaadhaar.uidai.gov.in, enter your Aadhaar number, and verify via OTP sent to registered mobile number.
Is this tool free?
Yes, completely free with unlimited validations. No registration or login required.