Paste any GSTINbelow to instantly check whether it's a well-formed, valid GST number. This tool verifies the 15-character format and recomputes the official check digit, and decodes the state and the embedded PAN. It runs entirely in your browser — nothing is sent anywhere, and it's free with no login.
What this tool checks
- Format — exactly 15 characters in the correct pattern.
- Checksum — the 15th character is a mathematical check digit; we recompute it to catch typos and made-up numbers.
- State — decoded from the first two digits.
- PAN — characters 3–12 are the business's PAN.
What it can't tell you
A valid checksum means the number is well-formed— not that the GSTIN is live, or that the business is real and active. For that you need to check the GST portal's live status, filing history and legal name. See how to verify a GSTIN online — or let SupplierProof do the whole check (GST status, filings, directors, charges and an AI risk verdict) in one step.