GSTIN Validator & Lookup
Validate a 15-character GSTIN offline — format, the official mod-36 check digit, the state and the embedded PAN — then open the official GST portal search with the GSTIN already copied to read the legal name, status and address.
15 characters · format NNAAAAANNNNANZN · press Enter to look up
Frequently asked questions
Does this confirm the GSTIN is registered?
The format, check digit, state and PAN are validated offline in your browser. To confirm registration, press “Open official GST search” — it opens gst.gov.in with the GSTIN copied; you type the captcha there and the portal shows the legal name, status, address and return filings.
What is the GSTIN check digit?
The 15th character is a checksum computed from the first 14 using an official mod-36 algorithm. If it does not match, the GSTIN has a typo or is invalid.
What does a GSTIN contain?
Characters 1–2 are the state code, 3–12 are the PAN of the business, 13 is the entity/registration number for that PAN in the state, 14 is "Z" by default, and 15 is the checksum.
Stop calculating GST by hand
Our offline desktop app does this on every invoice — correct CGST/SGST/IGST, GSTIN validation, HSN/SAC and filing-ready returns. Try it free for 14 days.