GST-compliant invoices in 30 seconds.
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Yes — fully free, no signup required, no watermark on the PDF. Generate as many invoices as you want. The tool runs entirely in your browser; nothing is stored on our servers.

When seller and buyer are in the same Indian state, GST is split equally into CGST (Central) and SGST (State). When the states are different, the entire GST amount is charged as IGST (Integrated GST). This calculator picks the right split automatically based on the states you select.

HSN (Harmonised System of Nomenclature) is for goods, SAC (Services Accounting Code) is for services. As a freelancer or service provider, you typically use SAC codes (e.g. 998391 for advertising services, 998314 for IT design, 998313 for IT consulting). The HSN/SAC is required if your turnover exceeds ₹5 crore; otherwise it is optional.

A GSTIN is 15 characters: first 2 digits are the state code (e.g. 29 for Karnataka, 27 for Maharashtra), next 10 are the PAN of the business, the 13th is the entity number, the 14th is "Z" by default, and the 15th is a checksum. Example: 29ABCDE1234F1Z5.

Only if your annual turnover crosses ₹20 lakh (₹10 lakh for special-category states). Below that you do not need to register for GST. If you are not GST-registered, leave the GSTIN field blank — the invoice is still valid as a normal invoice.

Yes — a GST-compliant invoice generated here is legally valid as long as it contains the mandatory fields: invoice number, date, seller and buyer details (with GSTIN if applicable), HSN/SAC code (if mandatory for you), description, quantity, rate, and tax breakdown. The PDF this tool generates includes all of these.

Not with this free tool — it generates a PDF for you to download and send manually. If you want auto-saving, automatic payment links inside the invoice, WhatsApp + email delivery, and follow-up reminders, sign up for ClearWork — there is a free plan.