Use a trusted PDF application with a Combine/Merge function, add the PDFs in the desired order, then save the new combined file.
Step by Step
- Make copies of important originals before editing.
- Open a PDF application that supports combining files.
- Choose its Combine, Merge, or Organize function.
- Add the PDFs.
- Arrange them in the desired order.
- Create the combined PDF and save it with a new filename.
- Open the finished PDF and verify page order and completeness.
If That Doesn't Work
- Avoid uploading confidential documents to an unfamiliar online PDF service.
- If a PDF is digitally signed or protected, combining it may invalidate signatures or be restricted.