Drop a multi-page TIFF above, get one PDF back with every page kept, in order.
Scanners produce this format by default, and almost nothing opens it. Feed twenty sheets through a document feeder and most scanners write a single .tif holding all twenty pages. It is a sensible design: one file, one document, nothing lost. Then the file reaches someone who needs to read it, and the browser, the upload form and the email preview all refuse it.
Every page becomes a page. A ten-page scan arrives as a ten-page PDF, in the order the scanner wrote them. That is the whole reason this door exists, and it is what separates it from converting the file to an image, where only the first page can come out.
Each page is sized to its own scan, and nothing is cropped or given an invented white margin around a sheet that was never quite A4.
The pages are redrawn on the way in. PDF has no room for the TIFF container itself, and each page is re-encoded as a high-quality JPEG. On scanned text, forms and receipts the difference is invisible; for archival work where every pixel is the point, TIFF to PNG keeps the original exactly.
Size: uncompressed scans commonly run 20 to 50MB per page, and the same page inside the PDF lands in the hundreds of kilobytes.
Scans bind in the order you drop them, and a numbered batch arrives in sequence.