Free tools
GST tools for Indian businesses
Search HSN codes, validate GSTIN format, and remove GST from totals — free in the browser. Save history and bill offline in the PocketGST app.
GST Calculator
Add or remove GST instantly with live CGST/SGST and total breakdown.
Try toolHSN Code Lookup
Search HSN/SAC codes with GST rates for goods and services.
Try toolGSTIN Validator
Verify GSTIN format, checksum, state code, and PAN.
Try toolReverse GST Calculator
Remove GST from an inclusive total — CGST/SGST or IGST split.
Try toolGST State Codes
Full list of 2-digit GST state codes — find the state behind any GSTIN.
Try toolGST Late Fee Calculator
Estimate GSTR-1/3B late fee and 18% interest for delayed filing.
Try toolDiscount + GST Calculator
Apply a discount, then add GST to get the final billable amount.
Try toolGSTIN Format Explainer
Decode the 15 characters of any GST number — state, PAN, checksum.
Try tool
All tools offline in PocketGST
HSN search, GSTIN checks on invoices, GST math with history — no internet at the counter or on site.