Invoice Generator

How to use the Invoice Generator

1. Enter your business details and the customer’s details, then set the invoice number, dates and currency.
2. Add a line item for each product or service with a description, quantity and unit price. Add an overall discount and a tax rate if they apply.
3. Check the preview. Totals update as you type, and anything that needs fixing is listed above the preview.
4. Click “Print / Save as PDF” and choose “Save as PDF” as the destination in your browser’s print dialog.

Good to know

• Calculation order: line amount = quantity × unit price, rounded to the currency’s smallest unit; subtotal = sum of lines; discount comes off the subtotal; tax is applied to the discounted subtotal; total = subtotal − discount + tax.
• Rounding is half away from zero (so 0.5 of a cent rounds up). Quantity and unit price accept up to 4 decimals, tax up to 3, a percentage discount up to 2.
• There is one overall discount (a percentage or a fixed amount), not a discount per line. A fixed discount larger than the subtotal is rejected rather than silently reduced.
• Currencies use their standard minor units: two decimals for most, none for Japanese yen. Amounts are displayed with US-style number formatting.
• Nothing is saved. Your invoice lives only in this page, so closing or reloading it clears it. Use “Save as PDF” to keep a copy.
• This is a template, not tax or legal advice. It does not check that an invoice meets the invoicing, tax or e-invoicing requirements of any country; that remains your responsibility.

Examples

Tax is charged after the discount

Subtotal 100.00, 10% discount (−10.00), tax 8.25% on the remaining 90.00 = 7.43 (7.425 rounded up). Total 97.43.

Quantities with decimals

1.5 hours at 19.99 = 29.985, rounded to 29.99 on that line. Rounding happens once per line, so the lines always add up to the subtotal shown.

No floating-point surprises

0.10 + 0.20 gives exactly 0.30, and 3 × 33.33 gives exactly 99.99, because amounts are calculated as whole cents (or whole yen) rather than with floating-point numbers.

Frequently asked questions