One file
Merge PDF files
Drop two or more PDFs. The first file in the picker is page 1 of the result. Bookmarks that only made sense in one file are not rebuilt.
How to use it
Pick several files
Hold Ctrl or Shift in the file dialog, or drop a stack.
Order
The picker order is the page order. Re-select if you need a different sequence.
Download one PDF
Info metadata comes from the first file.
FAQ
Is there a page limit?
The cap is size (20 MB per file, eight files), not page count. Very large page trees can still time out.
Are forms and outlines preserved?
Page content and resources are. Interactive structure across files is not rebuilt.