Set up your input
Choose a batch size, then select a sample to see its twelve digits multiplied by weights 13 through 2.
Little helpers for test data
Thai ID test number generator
Generate 13-digit test numbers with a correct checksum and a calculation breakdown. No identity verification.
Results
Your results will appear here.
How to use
Review and adjust
Use the main button to see the result. Adjust your input and run it again. Processing stays in this browser.
Use the result
Copy the result into your test system. Where download buttons are shown, files are created from the current result in your browser. Inputs and outputs are not saved or uploaded.
Try these examples
Test input handling
Use one sample to test a form that checks the final digit.
Test presentation and integration
Download 1,000 samples as JSON to test string inputs. Checksums do not establish identity or issuance.
References and limits
checkDigit = (11 − (sum % 11)) % 10
Sample numbers may coincide with real numbers. A correct checksum or matching format does not prove issuance or identity.
Check digit arithmetic example (Thammasat University)