Upload a PDF and pick the output sheet size. The tool lays two consecutive pages onto each landscape sheet, scaling each to fit, and downloads the combined PDF.
2-up means two document pages are printed on a single physical sheet, side by side. It is a common way to save paper for drafts and handouts.
Yes. Each page is shrunk to fit its half of the sheet while keeping its aspect ratio, so nothing is stretched or cut off.
The final sheet simply holds one page on the left and leaves the right half blank.