Free GST Billing Software for Small Businesses
InstaInvoice brings billing, stock, payments and GST reports together, so you enter each sale once and everything else updates by itself: stock goes down, the customer's balance goes up, and your GSTR-1 is ready at month end.
Use it in any browser on your laptop, tablet or phone, or install the Windows app to bill completely offline.
Free forever for billing · No credit card · Works on mobile, laptop and Windows
Highlights
Fast counter billing
Barcode scanning, product search, price lists and thermal receipts.
Stock that stays right
Every invoice updates stock; multiple warehouses, batches and expiry dates.
Know who owes you
Part payments, aging report, client ledger and WhatsApp reminders.
GST returns ready
GSTR-1 and GSTR-3B summaries with JSON for the portal and Excel export.
Who it is for
- Retail shops and supermarkets that need quick billing and receipts
- Wholesalers and distributors with price lists, delivery challans and credit sales
- Traders and manufacturers raising purchase orders and sales orders
- Pharmacies tracking batches and expiry dates
- Mobile and electronics stores tracking serial numbers and IMEI
- Consultants, agencies and freelancers billing services with SAC codes
Everything a GST business needs
Beyond invoices you can create quotations, proforma invoices, sales orders, delivery challans, credit notes, debit notes and purchase orders, and record purchase bills and expenses so your Input Tax Credit is not missed. Reports include the sales register, profit and loss and a balance sheet.
How to do it with InstaInvoice
- 1Create a free account and enter your business and GST details.
- 2Import or add your products and customers (CSV import is supported).
- 3Bill from the browser or the Windows app; stock and balances update automatically.
- 4At month end, download GSTR-1 and GSTR-3B data for your return.
Frequently asked questions
Which GST billing software is free?
InstaInvoice is free for GST billing with unlimited invoices and PDF downloads. CRM and inventory modules are optional paid plans.
Does it work offline?
Yes. The Windows desktop app works without internet and keeps your data on your computer.
Can I file GSTR-1 from it?
It prepares your GSTR-1 data, including B2B, B2C, credit and debit notes and the HSN summary, as JSON you can upload on the GST portal.
Is my data safe?
Each account can see only its own data, connections are encrypted, and you can download a full backup at any time.
Can I use it on my phone?
Yes. It works in the browser on Android and iPhone, with nothing to install.