GSTIN validator — format, checksum and state
Paste a GSTIN and check its format and checksum, and decode the state and embedded PAN. It validates in your browser (0 uploads, works offline).
How to use it
- Enter your figures in the fields above.
- The result and the formula used appear instantly.
- Copy or Download the result.
FAQ
How do I validate a GSTIN for free?
Paste the 15-character GSTIN and this page checks its structure and the official GSTN checksum in your browser, with no upload — and decodes the state code and the embedded PAN. A valid checksum means it is well-formed, not that the business is registered.
Does a valid checksum mean the business exists?
No — only that the number is correctly formed and its check digit is right, so it is not a typo. Confirming the business is actually registered requires the GST portal; this is an offline format and checksum check.
Is the GSTIN uploaded?
No. Validation runs entirely on your device against the public checksum algorithm; nothing is transmitted, and it works offline.
What do the parts of a GSTIN mean?
The first two digits are the state code, the next ten are the holder's PAN, the thirteenth is the entity number, the fourteenth is Z, and the last is the checksum.
Limits
Checks format, checksum, state and PAN. It does not query the GST portal for registration status.
Related
The PAN validator checks a PAN; the GST state-codes tool lists every state code.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.