Free Aadhaar Number Validator
Check whether an Aadhaar number is correctly formatted using the Verhoeff algorithm. Validation runs entirely in your browser — the number is never sent to a server.
Learn more: How businesses use Aadhaar validation | Privacy & legal considerations
This tool is free to use and processes all data locally in your browser.
Accurate Validation
Checks length, first-digit constraints, and the Verhoeff checksum — the same algorithm used by UIDAI.
Instant Results
Validation runs in your browser as soon as you submit — no round-trip to a server.
Secure & Private
The number you enter never leaves your device. Nothing is transmitted or stored on our side.
What is Aadhaar Number Validation?
Aadhaar number validation is the process of checking whether a 12-digit Aadhaar number follows the correct format and passes mathematical verification using the Verhoeff algorithm. This checksum algorithm helps detect common errors like typos, transpositions, and invalid digits.
Important: Format validation checks if a number looks valid but does not verify if it has been officially issued by UIDAI or confirm identity. For official identity verification, you need to use UIDAI’s authentication services.
Common Use Cases
- KYC processes: Pre-validate Aadhaar numbers before initiating costly verification procedures
- Payroll systems: Ensure employee Aadhaar numbers are correctly formatted to prevent payment failures
- Form validation: Provide instant feedback to users entering their Aadhaar number
- Data quality: Clean and verify existing database records
Read more: How businesses use Aadhaar validation for KYC, payroll, and onboarding
Privacy and Security
The Aadhaar number you enter never leaves your device. All validation logic runs in your browser — nothing is sent to our servers and nothing is stored on our end. What you type into the input stays in your browser’s memory until you close the tab.
Learn more: Privacy and legal considerations when using Aadhaar data
Frequently Asked Questions
See the FAQ for answers to common questions about how validation works, what the tool can and cannot tell you, and how the numbers are handled.