What checksum does this use?

It uses the standard Israeli ID checksum, a Luhn variant — each of the 9 digits is multiplied alternately by 1 and 2 starting from the left, two-digit products are reduced by 9, and the number is valid when the total is divisible by 10.

How accurate is the result?

A valid checksum confirms the number is well-formed, but it does not mean the number is issued or belongs to anyone — it has no link to any government database.

Why are shorter numbers padded with zeros?

A Teudat Zehut is always 9 digits, but leading zeros are often dropped when written. The validator left-pads any shorter input to 9 digits before running the checksum, so a number like 1234567 is treated as 001234567.

How is the two-digit product reduced?

When a digit multiplied by 2 gives a two-digit result (e.g. 8 × 2 = 16), the digits are summed (1 + 6 = 7), which is equivalent to subtracting 9. This is the same digit-sum step used in the Luhn algorithm.

Does the number reveal age or gender?

No. Unlike some national IDs, the Israeli Teudat Zehut is essentially a sequential number with a check digit. It does not encode date of birth, gender or place of registration.

Is my ID number sent anywhere?

No. The validator is privacy-first — all processing happens locally in your browser and the number never leaves your device.

Israel Teudat Zehut (ID) Validator

Israel Teudat Zehut (ID) validator

Validate an Israeli Teudat Zehut (תעודת זהות) number — the 9-digit national identity number. This helps developers and data-entry teams catch typos in forms and records before submission, without ever contacting a government system.

How it works

The tool left-pads shorter input to 9 digits, then applies the standard Israeli checksum, a Luhn variant:

Multiply each digit, left to right, alternately by 1 and 2 (first digit ×1, second ×2, and so on).
If any product is two digits, subtract 9 (equivalently, sum its digits).
Add all the results. The number is valid when the total is divisible by 10.

Example

For 123456782, weights 1,2,1,2,1,2,1,2,1 give: 1, 4, 3, 8, 5, 12→3, 7, 16→7, 2. Summing: 1 + 4 + 3 + 8 + 5 + 3 + 7 + 7 + 2 = 40, which is divisible by 10, so the checksum is valid.

It is privacy-first: nothing leaves your browser. A valid checksum only means the number is well-formed — it carries no link to any government database and the number encodes no date of birth or gender.