Is it really free - any limits or watermark?
Yes. Unlimited invoices, no sign-up, no account, and no watermark on your PDF. It's a free tool by Trebots.
How does CGST/SGST vs IGST work?
It's automatic from the Place of supply. Same state as the seller → the GST rate splits into CGST + SGST (half each, e.g. 18% → 9% + 9%). Different state → a single IGST at the full rate. You never calculate it by hand.
Can I invoice foreign clients / in another currency?
Yes. Pick a currency (USD, EUR, GBP, AED, and more) and set Place of supply → Outside India (Export). Exports are treated as inter-state IGST, usually 0% under LUT/bond. Amounts are shown in the chosen currency - no exchange-rate conversion is applied.
Are my invoices saved or uploaded anywhere?
Your invoice data is never uploaded to any server - everything runs in your browser. For convenience, an in-progress draft is auto-saved locally on this device only (in your browser's storage) so you don't lose work if the tab closes. It's never sent anywhere; you can wipe it anytime with Clear draft or Reset, and clearing your browser data removes it too.
What makes a valid GST tax invoice?
Seller name, address & GSTIN; a unique sequential invoice number and date; buyer details; place of supply; per-item description, HSN/SAC, quantity, rate and taxable value; the tax rate and amount (CGST/SGST or IGST); the grand total; and the amount in words. This tool builds the invoice around those fields.
Do I need GST registration to use this?
The tool is free for anyone, but to issue a tax invoice and actually charge CGST/SGST/IGST your business must be registered under GST. Registration is generally required once turnover crosses ₹40 lakh for goods or ₹20 lakh for services (lower in some special-category states). If you're not registered, you shouldn't charge GST. Confirm your status with a tax professional.
Tax invoice vs bill of supply - which does this create?
This produces a tax invoice - what a GST-registered business issues when charging GST. A bill of supply is issued instead by composition-scheme dealers or for exempt/nil-rated goods, where no GST is charged. If that's you, the heading and rules differ - check with your CA before using this format.
What are HSN and SAC codes - do I need them?
HSN (Harmonized System of Nomenclature) codes classify goods; SAC (Services Accounting Code) codes classify services. GST requires them on tax invoices, with the number of digits based on your turnover (typically 4 digits up to ₹5 crore, 6 digits above). Enter the code for each item - if you're unsure, check the GST portal or ask your accountant.
How should I number my invoices?
GST requires invoice numbers to be unique and consecutive within a financial year, up to 16 characters (letters, numbers, / and - allowed). The tool suggests something like INV-2026-001, but you keep your own running sequence - don't skip or repeat numbers.
Which GST rates can I use?
Set the rate per line item, or choose Custom for any percentage. After the September 2025 rate rationalisation, GST centres on two main slabs - 5% and 18% - alongside nil-rated goods and a 40% rate on select luxury and "sin" items; a few special rates (such as 3% on gold) still apply. Because you pick the rate per item, the tool stays correct as slabs are revised - just apply what's current for your goods or services, and confirm with your accountant if unsure.
Can I add a logo, bank details, discounts and notes?
Yes. Upload your logo, add bank / UPI / payment details, apply a per-line discount (GST is calculated on the discounted amount, as the law requires), and include notes or terms. Everything you add appears on the live preview and the downloaded PDF.
Does it work on my phone, and can I reopen an invoice later?
It works on any modern phone, tablet or computer - the form and A4 preview adapt to your screen. Your latest draft is saved locally on this device, so if you reload or accidentally close the tab it's restored automatically - but only in this browser. It's still best to download the PDF, since clearing your browser data or switching devices loses it. To start over, use Reset (or the “Try a sample invoice” button).