Tax · Free tool
GSTIN Validator
Verify the format and checksum of any 15-character Indian GSTIN. Decodes state code and the embedded PAN to confirm everything ties up.
How GSTIN is structured
A GSTIN is 15 characters: 2-digit state code + 10-char PAN + 1 entity number + Z + checksum. The checksum uses a base-36 weighted sum, so a typo anywhere in the GSTIN typically produces an invalid checksum.
This validator catches format errors and checksum mismatches. For confirming the GSTIN actually exists in the GST registry, use the official GST portal's “Search Taxpayer” feature.