How it works
- 01
Add your PDFs
Drop them in any order, from anywhere on disk. A password-protected file stops the merge with a message that says so.
- 02
Set the order
Drag a card, use the arrows, or press Sort A to Z. Remove a file if it does not belong.
- 03
Merge and download
You get one PDF. With Add bookmarks per file on, a bookmark marks where each source file begins.
What merging preserves
Merging copies each page as it is and draws nothing again. Text stays selectable, vector artwork stays sharp, and embedded fonts come along unchanged. Page sizes are kept by default, so an A4 report and a US Letter appendix can share one document at their own sizes.
Normalise to A4 or Letter scales every page to fit one size. It draws each page into the new one, so text stays sharp, but links and form fields are dropped. Keep the original sizes if you need them.
A few things change either way. Form fields with the same name can collide across files, so Flatten form fields is there to turn them into plain page content. The title of each file cannot be merged, so the output takes your output filename as its title. Digital signatures do not survive a merge, because the signed bytes no longer exist in the new file.
- Files per merge
- No fixed limit, and you set the order.
- Page count
- No cap. Your browser's memory sets the limit, and a big merge takes longer.
- Encryption
- Password-protected PDFs need unlocking first.
- Bookmarks
- One outline entry per source file, marking where it begins.