Invoice Generator

Is this invoice legally valid in my country?

The tool produces a document layout, not a compliance check. Rules for invoices differ by country and are not covered here: invoice numbering sequences, tax or VAT/GST registration numbers, required wording such as “tax invoice”, seller and buyer address rules, and what must be shown for reverse-charge or exempt sales. There is no field for a tax ID, so add one to your address line or notes if your jurisdiction needs it, and ask an accountant what applies to you.

How are subtotal, tax and total calculated?

Each line amount is quantity × rate, the subtotal is the sum of all line amounts, tax is subtotal × tax rate ÷ 100, and the total is subtotal plus tax. There is a single tax rate for the whole invoice, applied to the full subtotal; per-line rates, tax-inclusive pricing and compound taxes are not supported. The tax row appears only when the rate is above zero.

What happens if I type a comma or a currency symbol in a quantity or rate?

The fields are read as plain decimal numbers, so reading stops at the first character that is not part of one. Typing “1,000” as a quantity is read as 1, and “abc” in the tax field is read as 0. Type 1000 without a separator and no symbol. Anything that cannot be read counts as zero.

Can I add a discount line?

Yes, by giving a line a description and a negative rate, such as “Early-payment discount”, quantity 1, rate -100. It reduces the subtotal before tax is added. Negative amounts are printed with the sign after the symbol, for example €-100.00. A negative-rate line with no description is left off the printed invoice but is still counted in the subtotal, so always describe such a line.

Which lines are shown on the printed invoice?

Up to eight lines can be entered. A line is printed if it has a description or a rate above zero; a completely empty line is dropped. Totals are computed from the unrounded line amounts, while each line is shown rounded to two decimals, so a column of displayed amounts can differ from the printed subtotal by a cent. With three units at 0.335 on each of two lines, each shows 1.01 and the subtotal shows 2.01.

Which currencies are available, and does the tool convert between them?

USD ($), EUR (€), GBP (£), INR (₹), AUD (A$) and CAD (C$). The choice only changes the symbol placed before numbers. No exchange rates are used, and every currency is shown with a comma thousands separator and a decimal point, two decimals.

Are my invoice details saved?

The page keeps them in memory while it is open, and the code contains no storage calls, so reloading the page returns it to the starting values. Download the PDF before you leave. The invoice number starts as INV-001 and the dates start as today and thirty days ahead, but all three are ordinary text boxes you can overwrite.

How does the PDF download work, and what about the logo?

The Download PDF button calls the browser’s print function, and a print stylesheet hides everything except the invoice preview, so you choose “Save as PDF” in the print dialog. A PNG, JPG or SVG logo up to 2 MB is embedded in the page. The Modern template draws the logo in the coloured header as a white silhouette, so a logo that depends on its own colours loses them there; the other templates show it unchanged.