Start with a document map
Before merging, list the files in the exact order a reviewer should read them. Put cover letters, summaries, invoices, appendices, and evidence files into a simple sequence before touching the PDF tool.
Rename files with a two-digit prefix such as 01-cover-letter.pdf and 02-invoice.pdf. This avoids accidental alphabetical sorting problems and makes the merged file easier to rebuild later.
Preserve page numbers and headings
If the source documents already have page numbers, avoid adding a second page-number layer unless the recipient specifically needs one. Duplicate page numbers are confusing in legal, academic, and accounting reviews.
For long packets, add a short table of contents or bookmark list after merging. Even a plain first page with section names can make a large PDF feel intentional instead of dumped together.
Watch file size and image quality
Merging scanned documents can create very large PDFs. Compress after merging, not before, so you can check the final quality once and avoid repeatedly degrading the same pages.
If signatures, stamps, diagrams, or small print matter, inspect those pages at 100 percent zoom after compression. A file that looks fine in thumbnail view may be unreadable when printed.
Protect sensitive attachments
Remove duplicate bank statements, old ID scans, blank forms, and draft pages before merging. A final PDF often travels farther than the source files, so it should contain only what the recipient needs.
If the merged file contains private data, use real redaction before sharing. Drawing a black box over text is not enough if the text remains selectable underneath.