Free · Client-side

Thai ID / TIN Validator

Instantly validate any 13-digit Thai ID or Tax ID. Real-time checksum (mod-11) with full digit breakdown. 100% client-side — no data leaves your browser.

13-Digit Thai ID / TIN

0/13 digits

Type all 13 digits — checksum is validated in real time.

Thai ID Structure

Digits	Meaning	Example
1	Holder type code (0=juristic, 1=citizen born after 1984, 2=before 1984, 3=naturalized, 4=foreign permanent, 5=foreign temporary, 6=no status, 7=special, 8=alien/refugee)	3
2–5	Registration district / tax office code	1001
6–12	Sequential number within the district	0012345
13	Mod-11 checksum digit (auto-calculated)	8

Privacy: This tool runs entirely in your browser using JavaScript. No data is sent to any server. Nothing is logged or stored.

Also check company info

Use the Company Lookup tool to fetch registered name, address, and VAT status from the Thai Revenue Department.

Check Company Info