What this generator does and does not do
It does the arithmetic and gives you a document you can send. Quantity times unit price per line, subtotal, VAT at the rate you set, total. The standard VAT rate in Israel is 18 percent, and the field is editable because zero-rated and exempt cases exist.
What it cannot do is make the result a legal tax invoice. In Israel a tax invoice has to carry a number from an unbroken sequence, it has to be kept in a form that cannot be edited after issue, and above a certain amount it needs an allocation number from the Tax Authority before it is valid for the customer to deduct input VAT. A page that generates a PDF has no way to guarantee any of that. Details are in the invoice checklist and the VAT guide.
How the arithmetic works here
Each line is quantity times unit price. The subtotal is the sum of the lines, VAT is the subtotal times the rate you set, and the total is the two added. Rounding happens once, at the end, on each displayed figure rather than line by line, which is why the lines occasionally look one agora away from adding up exactly.
The rate field is editable rather than fixed at 18 percent because real invoices are not all standard rated. Exports and certain services to foreign residents are zero rated, and an exempt dealer issues documents with no VAT at all. Set the rate to zero for those and the VAT row shows zero rather than disappearing, which is what a zero-rated document should look like.
Quote, proforma, transaction invoice
These three all say here is what it will cost, and none of them is a tax invoice. A quote is an offer, and it commits nobody until accepted. A proforma is a document that looks like an invoice and is explicitly not one, most often sent so a customer can arrange payment or an import. A transaction invoice, חשבון עסקה, is the Israeli document for the same purpose: it demands payment and creates no VAT obligation, and the tax invoice follows when the money arrives.
That last one is why the distinction matters for cash flow. Sending a transaction invoice and issuing the tax invoice on payment means your VAT obligation follows the money instead of running ahead of it. Sending a tax invoice on delivery means you may owe the VAT for a period in which the customer has not paid you yet.
Printing and saving
Use your browser's print dialog and choose save as PDF. The page hides the site header, footer and this explanatory text when printing, so what comes out is the document alone. A4 with default margins is the size everyone expects; if a line wraps awkwardly, shortening the description is a better fix than shrinking the scale.
Nothing you type is sent anywhere. There is no server behind this page, no account, and no storage. That also means nothing is kept: closing the tab loses the invoice, so save the PDF before you navigate away. If you need the same customer details next week, keeping the PDF and retyping is the whole workflow, and it is exactly the point at which real invoicing software starts being worth its monthly cost.
Use this for a quote, a proforma, or a customer who just needs the numbers on paper. When you need a real tax invoice with sequential numbering, a frozen copy of the issued document and allocation numbers requested automatically, move to invoicing software built for Israeli rules.