Aadhaar Number Validator
Aadhaar Number Validator: free, instant and private. The checksum catches the common mistakes — a mistyped digit or two swapped digits — without any database lookup.
How the Aadhaar Number Validator works
The Aadhaar Number Validator takes Aadhaar number and returns the answer instantly — no button to hunt for, no page reload. The checksum catches the common mistakes — a mistyped digit or two swapped digits — without any database lookup. UIDAI itself recommends sharing only the masked Aadhaar (last 4 digits) wherever possible.
Enter your own numbers to replace the example values; the result panel updates as you type. Everything runs in this single page, so nothing you enter leaves your device.
Formula used
12 digits, first 2–9, final digit is a Verhoeff checksum
| Symbol | Meaning |
|---|---|
| Verhoeff check | the same error-detecting code used by credit cards, tuned to catch transposed digits |
The checksum catches the common mistakes — a mistyped digit or two swapped digits — without any database lookup. UIDAI itself recommends sharing only the masked Aadhaar (last 4 digits) wherever possible.
Inputs used: Aadhaar number.
Worked example
Take the default example — aadhaar number of 234123412346:
- Verdict: true
- Details: Checksum valid (Verhoeff) · format 12 digits
Frequently asked questions
- What formula does the Aadhaar Number Validator use?
- It uses 12 digits, first 2–9, final digit is a Verhoeff checksum, where Verhoeff check is the the same error-detecting code used by credit cards, tuned to catch transposed digits.
- Is the Aadhaar Number Validator free?
- Yes. There is no signup, no usage limit and no watermark — the calculator runs entirely in your browser.
- How do I read the result?
- The checksum catches the common mistakes — a mistyped digit or two swapped digits — without any database lookup. UIDAI itself recommends sharing only the masked Aadhaar (last 4 digits) wherever possible.
- Does the Aadhaar Number Validator store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.