Free GST Number Verifier — Validate Any GSTIN

Enter a 15-character GSTIN to check its structure and checksum, and to read off the state, PAN and entity code it encodes. Free, instant, no signup.

Example: 27AAPFU0939F1ZV

How a GSTIN is built

A GSTIN (Goods & Services Tax Identification Number) is a 15-character code derived from your PAN:

  • Digits 1–2 — state code.
  • Characters 3–12 — the 10-character PAN of the business.
  • Character 13 — entity number (how many registrations the PAN holds in that state).
  • Character 14 — normally the letter ‘Z’.
  • Character 15 — a checksum digit that this tool re-computes to flag typos.

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