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Aadhaar Number Validator

Validates Aadhaar numbers using Verhoeff checksum verification. Checks format rules, detects fake UIDs, and explains Aadhaar number structure. Fully local validation with no data upload.

100% Local Browser Native

How to Use the Aadhaar Number Validator

1. Enter the 12-digit UID

Digits only — Verhoeff checksum decides validity, all local.

2. Read the verdict

Valid/invalid plus format-rule breakdown; fakes fail the checksum.

3. Never share the number

A valid structure is not consent — mask it (XXXX-XXXX-1234) everywhere public.

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Frequently Asked Questions

How does Aadhaar validation work?

Three checks run in sequence with animation: Format (exactly 12 digits, first digit 2–9), Verhoeff checksum (last digit validates the first 11), and Pattern Analysis (all-identical, sequential, and repeating patterns flagged suspicious). The tool checks all of these instantly, caps input at 12 digits, and can generate a valid test number plus XXXX XXXX last-4 mask.

Does a valid number mean a genuine card?

No. Validation proves the number is well-formed, not that UIDAI issued it to the holder. For onboarding or KYC, always verify against UIDAI e-KYC or masked-Aadhaar XML — never trust format alone.

What is masked Aadhaar?

A version showing only the last 4 digits (XXXX-XXXX-1234), downloadable from myAadhaar. Share masked copies wherever full numbers aren't legally required — it limits exposure if the copy leaks.

What should I never do with Aadhaar numbers?

Never publish full numbers, email them unencrypted, or store them in spreadsheets without need. Collect only with consent and a stated purpose, per the Aadhaar Act.

Is the number I check uploaded?

No. Validation runs entirely in your browser via the Verhoeff algorithm. Numbers never leave your device.

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Manually black out the first 8 digits of your 12-digit Aadhaar number on card images by drawing boxes — download the masked copy. Fully local processing.

Last updated October 2026