How the free fastbillgen tools work
The free document generators, calculators and templates run in your browser. A signed-in workspace is separate and stores only the records you choose to save there.
From form to PDF
- Open a generator such as Invoice Generator. The page and its PDF code download to your browser.
- Enter your business and customer details. The free generator holds them on your device while you work. Some reusable form details may also be saved in this browser's local storage; clearing browser data removes them.
- Check the on-page preview, then choose Download. The browser builds the PDF and saves it to your device. The free generator does not upload the document fields or finished PDF to our server.
If a long invoice spans more than one page, the export paginates its line items. When a PDF font cannot represent a character, the exporter may render that text as an image to preserve its visible appearance. Image text is not selectable or searchable in the resulting PDF, so inspect the export before sending it.
Calculators show their working
A calculator such as Profit Margin Calculator reads the numbers you enter, evaluates the formula in the browser and shows the inputs and result. VAT and GST rates depend on location, supply type and date. The rate shown is a starting point to check against the relevant tax authority, not a determination of what your transaction legally requires.
When data does leave your device
Opening any page sends an ordinary request to our web host, and advertising services may process their own request data. The document fields of the free tools are not sent with those requests. If you choose the signed-in workspace, customer, invoice, payment and other records you save there are stored on our server so you can reopen them. Read Privacy for the distinction and Pricing for the workspace plans.
What the tools cannot do
The free tools do not synchronize completed documents across devices. They do not file invoices with a tax authority, register Indian e-invoices, or decide which tax rate applies. The site does not install an offline app, so load the page while connected; a browser may keep an already opened tab working for a time, but that is not an offline guarantee.
Before a release, the build checks that the free tool engines do not make outbound requests and drives the generators and calculators with synthetic inputs in a browser. This checks the product's implementation; it does not replace your review of the finished document or current tax guidance.