Create a single-signature saddle-stitch booklet from any normal, one-page-at-a-time PDF. Choose A4 or US Letter output and left- or right-side binding. Each source page is scaled proportionally into half a landscape sheet, centered, and never cropped.
The tool reads and rewrites the PDF on your device. It makes a separate download, leaves your original unchanged, and never sends the document to CanDoYa. The first-sheet preview shows both printed sides before you create the file.