Every spreadsheet becomes a table in the PDF, with its name. These are not Excel's print breaks: we break when the page is full, and the screen shows it first.
What it does not do: Formulas are not recalculated and charts are not carried over. Every column has the same width: a workbook with twenty columns will come out cramped. What this tool does not do, and it is the main thing: reproduce the original layout. It reads the CONTENT of the file and lays it out again with our typography, on A4. Margins, fonts, sizes, colours, columns, headers and footers are not carried over, and page breaks fall elsewhere. Images and charts are not carried over either, and the screen counts what is missing before you save. Finally, our font writes Western Europe: a document in Greek, Russian or Chinese would come out empty, and the screen says so.
Nothing is uploaded. Cut your network connection once this page has loaded: the tool keeps working. How to check it yourself.