Free GST Invoice Generator Online

If you run a business or work as a freelancer in India, every sale you make to a GST-registered entity needs a proper GST invoice — not just any bill. Our GST invoice generator lets you create a fully compliant invoice in your browser, free, with automatic CGST, SGST, and IGST calculation, updated for the new GST 2.0 rate slabs.

Fill in your business and customer details, add your line items, and download or print your invoice as a PDF in under two minutes.

What Is a GST Invoice?

A GST invoice is a legal document a registered supplier issues to a buyer, showing the value of goods or services sold along with the GST charged on that sale. It’s different from a regular bill because it must include specific fields mandated under GST law — your GSTIN, the buyer’s GSTIN (if registered), HSN or SAC codes, and a clear breakup of the tax charged.

Getting these details wrong, or leaving them out, can create problems at the time of GST return filing — for both you and your customer, since they may need your invoice to claim input tax credit.

Why You Need a GST-Compliant Invoice

If you’re registered under GST, issuing a proper invoice isn’t optional — it’s a legal requirement for every taxable sale above the prescribed threshold. Beyond compliance, a clean, professional invoice also:

Makes it easier for your customer to claim input tax credit, which keeps them coming back
Creates a clear paper trail for your own GST return filing
Looks more credible than a hand-written or informal bill, especially for freelancers and small businesses building client trust

How to Use Our Free GST Invoice Generator

Enter your business details — name, GSTIN, address, and state.
Enter your customer’s details — name, GSTIN (if they’re registered), address, and state.
Add your line items — description, HSN/SAC code, quantity, rate, and the applicable GST rate.
Toggle “interstate supply” if you’re billing a customer in a different state — this switches the calculation from CGST + SGST to IGST automatically.
Review the live preview, which updates as you type, then click Print / Save as PDF to download your finished invoice.

There’s no sign-up, no software to install, and nothing is sent to a server — everything runs directly in your browser.

Mandatory Fields in a GST Invoice

At a minimum, a valid GST invoice should include:

Invoice number and date
Your legal business name, address, and GSTIN
Customer’s name, address, and GSTIN (where applicable)
HSN code (for goods) or SAC code (for services)
Description, quantity, and rate of each item
Taxable value and GST rate applied
Clear split of CGST, SGST, or IGST as applicable
Total invoice value

Our generator includes every one of these fields by default, so you don’t have to remember the checklist yourself.

CGST vs SGST vs IGST — When Each Applies

This trips up a lot of first-time invoicers, so here’s the short version:

CGST + SGST apply when the sale is within the same state — the tax is split equally between the central and state governments.
IGST applies when the sale is between two different states (or exports) — a single integrated tax that goes to the central government, which then settles it with the destination state.

Our tool handles this automatically: toggle “interstate supply” on or off based on where your customer is registered, and the invoice recalculates the correct tax split for you.

New GST 2.0 Rates You Should Know

India’s GST structure changed significantly with the GST 2.0 reform, effective 22 September 2025. The earlier five-slab system — 0%, 5%, 12%, 18%, and 28% — was simplified:

The 12% slab was merged into 5%
The 28% slab was merged into 18%
A new 40% slab was introduced for select luxury and “sin” goods (like premium vehicles, tobacco, and pan masala)

So as of now, most goods and services fall under just 5% or 18%, with 0% for essentials and 40% reserved for a narrow list of luxury/demerit items. Our GST invoice generator’s rate dropdown reflects this updated structure — always double-check the exact HSN-wise rate for anything unusual, since a handful of special rates (like 3% on gold) still exist outside the main slabs.

Common Mistakes to Avoid in GST Invoicing

Charging CGST/SGST on an interstate sale (or vice versa) — this is one of the most common errors and can create mismatches during return filing.
Missing or incorrect HSN/SAC codes — required for most businesses above the applicable turnover threshold.
Applying an outdated GST rate — with the recent GST 2.0 changes, invoices generated using old templates may still show 12% or 28%, which no longer exist for most items.
Inconsistent invoice numbering — GST invoices should follow a sequential, traceable numbering system for the financial year.

Frequently Asked Questions

Is this GST invoice generator free to use? Yes, completely free, with no account or sign-up required.

Does this tool file my GST return for me? No — it only generates the invoice document itself. You’ll still need to report your sales through your regular GST return filing process (GSTR-1, GSTR-3B, etc.), using your accounting software or a tax professional.

Can I use this for a business that isn’t GST-registered? Yes — if you’re not registered under GST, you can simply leave the GSTIN fields blank and set the GST rate to 0% to generate a standard, non-GST invoice.

What’s the difference between HSN and SAC codes? HSN (Harmonized System of Nomenclature) codes classify goods, while SAC (Services Accounting Code) codes classify services. Both serve the same purpose — identifying exactly what’s being sold for GST rate purposes.

Is my data saved anywhere when I use this tool? No — everything happens locally in your browser. Nothing you type is transmitted to or stored on any server.

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