Is my file uploaded to a server?

No. This tool runs entirely in your browser via WebAssembly — your file never leaves your device. You can verify this in your browser's DevTools Network tab.

What is saddle-stitch imposition?

Pages are reordered so that when printed double-sided and folded in half, they read in the correct sequence. The first and last pages land on the outer cover.

Why are blank pages added to my booklet?

A saddle-stitch booklet requires a page count that is a multiple of 4. If your PDF has, say, 6 pages, 2 blank pages are added automatically to complete the final sheet.

PDF Booklet

Reorder pages for double-sided printing and folding — nothing is uploaded.

Local processing — your files never leave your browser