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Prepare the files before merging
A clean merge starts before you open a PDF tool. Rename files so their order is obvious: 01-cover.pdf, 02-contract.pdf, 03-attachments.pdf, and so on. This prevents mistakes when several files have similar names.
Open each PDF quickly before merging. Check that pages are upright, complete, and not password-protected. Fixing those issues after merging is possible, but it is slower.
Choose an order that matches how the reader will use it
Put the most important document first. For applications, that might be the application form. For invoices, it might be the invoice followed by receipts. For contracts, it is usually the agreement followed by appendices.
If the final PDF will be reviewed by another person, make the order boring and predictable. Reviewers should not have to hunt for the main document.
Review the merged result
After merging, scroll through the final PDF from start to finish. Confirm that every file appears once, pages are in the expected order, and page rotations still make sense.
If the file becomes too large after merging, compress the final PDF only after you confirm the page order. That keeps the workflow simple and avoids repeated compression passes.