English interface
Thai ID number format checker
Check the length and check digit without sending the number anywhere.
ReviewedCheck before reuse
Saves this tool's name on this device only (up to 20). No form values.
Only visible result text is included. Form fields are not read. Review sensitive values before sharing.
How to use it
- Enter the 13 digits.
- Review the format and check-digit result.
- Use the result only to catch typing errors.
Important limitation
A valid result does not confirm identity, citizenship, card status or existence in a government database.
The interactive form is fully localized in English.
Reviewed 2026-08-26; next review 2027-02-26.
Core calculations, cited sources and main examples have been reviewed within the stated scope.
Recorded updates
Site changelogReview history
Dates describe the review scope recorded below. A page update does not mean every source was checked again.
- Last recorded source/method review
Core calculations, cited sources and main examples have been reviewed within the stated scope.