Turkish ID Format Check: Algorithm Validation Guide
One wrong digit in an ID number can reject an application. This tool checks algorithmic consistency of the 11-digit number: first digit non-zero, digits 10 and 11 follow check rules. Processing stays on-device. Important: not an official identity lookup.
Step by step
- Type the 11-digit number into the box.
- Confirm the first digit is non-zero.
- Press check to run the digit-10 and digit-11 rules.
- Expect a valid verdict; compare digits one by one on error.
- Transfer the correct number to the form.
Example scenario
An applicant types the number into a form. The tool confirms a non-zero first digit and valid check digits. The verdict is valid. In another try with a wrong final digit, it reports invalid. The digits are compared with the ID card and corrected.
Check your result
Confirm 11 digits with non-zero first digit. Compare against the ID document. This is not official verification; use original documents for applications.
Frequently asked questions
Official lookup?
No, algorithmic consistency only.
First digit zero?
Never; leading zero is invalid.
How is digit 10 derived?
From odd and even position sum rules.
Foreign IDs?
No, numbers starting with 99 follow other rules.
Data sent?
No, checking is browser-local.
Open the tool: Turkish ID Format Check →
Keep an original copy before processing your file. Examples are illustrative; results depend on your document.