Free GST tool
GSTIN validator
A wrong GSTIN on an invoice means the buyer loses ITC. Check the format, state code, PAN and check digit in one click.
Indicative guidance based on law reviewed as of 13 October 2026. Always confirm against the notification in force and the facts of the case; this is not legal advice.
Check a whole client, not one invoice
Upload a purchase register and see every ineligible credit, rate mismatch and missing-in-2B invoice with the clause behind it.
Or take the 30-day full trial — every Professional feature, 3 GSTINs.