Catches typos and fakes the same way the GSTN portal does — state code, PAN format, check digit math. We don’t send anything to a server; the maths runs in your browser.
Format: SS (state) + PAN (10) + N (entity#) + Z + C (check digit)
How this works.GSTIN check-digit math (mod-36 weighted alternating) catches single-character typos — it’s the same check the GSTN portal applies before lookup. Use this before adding a vendor to your accounting system.
Need live GSTN lookup, vendor whitelisting, or batch PAN verification?
Our customer dashboard verifies vendor GSTINs in real-time, flags blacklisted vendors, and reconciles your GSTR-2A/2B with claimed input credit. Free for the first month.