A GSTIN is a 15-character GST identification number: 2-digit state code + 10-character PAN + entity digit + Z + checksum.

GSTIN Validator & Decoder

Q: How is a GSTIN validated?

By checking its structure and recomputing the official base-36 checksum over the first 14 characters.

Q: What does the GSTIN tell me?

The state (first 2 digits), the holder PAN (characters 3-12) and the taxpayer type.

Check whether a GST number (GSTIN) is valid and decode it instantly — the format and the official checksum are verified, then we show the state, the embedded PAN and the taxpayer type. Free, no signup.

Developers — the free GSTIN API:

GET https://api.apibharat.com/v1/gst/validate/27AAPCS1234A1Z5

Frequently asked questions

What is a GSTIN?

A GSTIN (Goods and Services Tax Identification Number) is a 15-character ID for a GST-registered business: 2-digit state code + 10-character PAN + 1 entity digit + 'Z' + 1 checksum character.

How is a GSTIN validated?

We check the structure and recompute the official checksum (a base-36 algorithm over the first 14 characters). This confirms the number is well-formed — it does not confirm it is registered with the GST department.

What does the GSTIN tell me?

The first two digits give the state, characters 3–12 are the holder's PAN, and the 4th character of that PAN reveals the taxpayer type (individual, company, HUF, firm, etc.).