Does the GST invoice tool log into the GST portal?

No. You type GSTIN, HSN, quantity, rate, and tax. The PDF downloads from this tab. It is not a filing and not an e-invoice IRN from NIC.

Are client GSTINs uploaded?

No. Seller, buyer, and line items stay in the browser. Merge and compress invoice packs locally before you upload only to the portal or the client drive.

CGST/SGST or IGST — who decides?

Intra-state supplies split CGST and SGST; inter-state supplies use IGST. The calculator multiplies what you enter. HSN codes and rates remain your responsibility.

Make a GST invoice PDF without uploading your books

Create an Indian GST tax invoice (HSN, CGST/SGST/IGST) in the browser. No GST portal credentials leave this tab.