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GSTIN Format Checker
Check whether a GST Identification Number (GSTIN) matches the official 15-character format — state code, PAN, entity code, and checksum position.
15 characters, e.g. 27AAPFU0939F1ZV
Format check
Valid format
- State code
- 27
- PAN portion
- AAPFU0939F
- Entity code
- 1
This only checks the structural format of the GSTIN — it does not verify the checksum digit or confirm the number is actually registered. To confirm a GSTIN is real and active, search it on the official GST portal (services.gst.gov.in).