Aadhaar Number Validator

Validate your 12-digit Aadhaar number instantly using the Verhoeff checksum algorithm. Check format and checksum validity.

Input

Enter 12 digits. Spaces are automatically handled.

Result

Enter an Aadhaar number and click Validate to see results.

About Aadhaar Validation

This tool validates Aadhaar numbers using the Verhoeff checksum algorithm, the same algorithm used by UIDAI. It checks both the 12-digit format and the mathematical checksum to detect typos and transcription errors.

📘 How Aadhaar numbers work
  • Aadhaar is a 12-digit unique identity number issued by UIDAI.
  • The last digit is a checksum digit computed using the Verhoeff algorithm.
  • The algorithm detects all single-digit errors and all adjacent transposition errors (e.g., swapping 45 → 54).
  • UIDAI officially recommends this algorithm for validation.
🔐 Privacy & security
  • All validation runs locally in your browser.
  • No Aadhaar data is sent to any server.
  • This tool does not verify if an Aadhaar number is actually issued — only if it passes checksum validation.
  • Never share your Aadhaar number publicly or with untrusted parties.

Related: UPI Validator . UPI QR Generator . PAN Validator

Frequently Asked Questions

Is this tool free to use?

Yes. All UpTools calculators are completely free, with no sign-ups required.

Is my data private?

Yes. All validation runs locally in your browser. Nothing is uploaded to any server.

Does it work on mobile?

Yes. All tools are mobile-responsive and work on any device — phone, tablet, or desktop.

Can I use this offline?

Most tools work offline after the initial page load. No internet needed for calculations.

📐 How This Tool Works

The Verhoeff algorithm uses three lookup tables:

  • D — multiplication table for checksum computation
  • P — permutation table for positional weighting
  • inverse — for final check digit verification

The checksum is computed from right to left, processing each digit through the permutation and multiplication tables.

Also try: Calculator · UPI Validator · PAN Validator

✅ Do's and ❌ Don'ts for Aadhaar Safety

✅ Do's

  • ✅ Do verify Aadhaar numbers before sharing with trusted parties.
  • ✅ Do use virtual Aadhaar (VID) for sharing instead of actual number.
  • ✅ Do lock your biometrics on the UIDAI portal when not in use.
  • ✅ Do report suspicious Aadhaar misuse to UIDAI immediately.

❌ Don'ts

  • ❌ Don't share your Aadhaar number publicly on social media.
  • ❌ Don't give your Aadhaar to unverified websites or apps.
  • ❌ Don't ignore SMS or email alerts about Aadhaar authentication.
  • ❌ Don't use photocopies of Aadhaar for KYC — use digital copies.