Questions? We have answers.

In what order will my merged PDF files appear?
Once you add the files you’d like to combine, you can drag and drop them into your preferred order. The top file in your list will appear first in the merged PDF file.
How many pages can I include in a merged PDF?
The Acrobat Merge PDFs tool lets you create a merged, single PDF document of up to 1,500 pages. You can combine up to 100 files, with each individual file limited to 500 pages.
Can I delete and reorder pages after I merge files?

When you combine PDF files with the Acrobat PDF merge tool, you can reorder, add, or delete files before you merge them into a single PDF. Sign in if you need to reorganize individual pages in your merged PDF. You can add, delete, move, or rotate PDF pages as needed until your content is in the desired order. When ready, share your merged file with others for viewing or commenting. Anyone can view the file in any web browser like Google Chrome using their preferred operating system, including Mac, Windows, and Linux.

You can also try Adobe Acrobat Pro for free for seven days to create PDFs, edit PDFs with PDF editor tools, add page numbers, insert bookmarks or watermarks, split PDF files, secure PDFs with passwords, convert PNG and other image files to and from PDF, and convert PDFs to and from Microsoft PowerPoint, Excel, and Word documents.