Invoiceo

Free tool · India

Free GSTIN validator

Paste a GST number to see at once whether it is built correctly, which state it belongs to and what PAN it carries. It catches the mistyped digit before it reaches an invoice.

15 characters: state code, PAN, a counter, the letter Z and a check character.

What the check covers

  • Length and characters: exactly 15 letters and digits.
  • The state code: the first two digits must be a code the GST system uses.
  • The PAN shape: five letters, four digits, one letter.
  • The 14th character: always Z.
  • The check character: the last character must match the other fourteen.

Questions people ask

Does this tell me whether a GSTIN is registered or active?

No. It checks that the number is built correctly: 15 characters, a real state code, a PAN-shaped middle, the letter Z, and a last character that matches the other fourteen. A number can pass all of that and still be cancelled or never have been issued. To confirm that, use the 'Search Taxpayer' tool on the GST portal.

What is inside a GSTIN?

The first two digits are the state code. The next ten are the business's PAN. The 13th counts how many registrations that PAN has in the state. The 14th is the letter Z. The 15th is a check character worked out from the other fourteen, which is how most typing mistakes are caught.

Is the number sent anywhere?

No. The check runs in your browser and nothing you type is sent to our server or stored.

What does the fourth character of the PAN mean?

It says what kind of holder the PAN belongs to: P for an individual, C for a company, F for a firm or LLP, H for a Hindu undivided family, A for an association of persons, B for a body of individuals, G for a government body, J for an artificial juridical person, L for a local authority and T for a trust.

Checked against the official sources

Last reviewed on 11 October 2026. Tax rules and limits change, and we cannot see your whole situation, so treat this page as a guide, not advice. If something here looks out of date, the official pages below are the ones to trust, and we would be grateful if you told us.

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