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GSTIN Format Validator
Check if a GSTIN follows the correct 15-character format — not an official verification
This tool validates GSTIN format only. It does not verify if the GSTIN is actually registered on the GST portal.
Enter 15-character GSTIN. Format: 2 digits state code + 10 PAN characters + 3 check characters.
GSTIN Breakdown
| Position | 1–2 | 3–7 | 8–11 | 12 | 13 | 14 | 15 |
|---|---|---|---|---|---|---|---|
| Value | |||||||
| Meaning | State code | PAN alpha | PAN digits | PAN check | Entity no. | Fixed Z | Check code |
How to use
- Enter a GSTIN in the input field above.
- The tool instantly validates the format and shows a breakdown.
- View the state code mapped to the Indian state.
- Check the entity number type (regular taxpayer, composition dealer, etc.).
GSTIN Structure
| Pos 1–2 | State code (01–37) based on Indian state |
| Pos 3–12 | PAN of the business entity |
| Pos 13 | Entity number — 1–9 (registrations) or Z (composition dealer) |
| Pos 14 | Fixed check digit — always Z |
| Pos 15 | Check code (alphanumeric) — internal verification digit |