Arrange source PDFs before combining them, distinguish file order from page order and verify the boundaries between documents in the merged result.
Decide how the reader should progress
A combined PDF should have an intentional sequence. A project pack might place a cover document before a report and supporting images. A set of lessons might follow a numbered progression. Write down the order when filenames alone do not make it clear.
Check revisions carefully. Including an old draft before a corrected version can confuse the reader even if every page is technically present. Remove unnecessary alternatives from your selection before starting the merge.
Reorder documents in the list
Select your files in Merge PDF and review the displayed names and page counts. Drag a document to its new position, or use Move up and Move down. The movement buttons provide a practical option for touch devices and keyboard users.
Do not assume the order in your operating system's file picker will be the final order. The list inside the tool is the sequence used for export. If you add another document later, place it where it belongs before generating the result.
Handle internal page changes separately
Reordering a PDF moves the whole file. It does not alter the sequence of pages within that source. For example, moving a ten-page report below a two-page introduction preserves the report's internal page order.
Use Split PDF if you want to extract or reorder a specific selection first. Save that new selection, check it, and then add it to Merge PDF as a separate source. Keep the original document so that an incorrect selection can be recreated.
Check every joining point
After merging, open the saved PDF and inspect each boundary. If the first file has two pages, the next document should start at file position three, regardless of the page numbers printed on the sheets. Review the final page as well. Correct ordering should be confirmed in the actual download, not only in the list that existed before the last edit.