Start with the final order
Before merging, decide how the final PDF should read. Put cover pages, forms, receipts, appendices, or supporting documents in the exact order you want readers to see them.
A merge tool is best when several finished PDFs need to become one file for email, an upload form, a print packet, or record keeping. Sorting the files first means you are not reopening and rebuilding the document afterward.
- Add all the PDF files
- Move files up or down into reading order
- Download one combined PDF
Watch page size and orientation
Merging keeps each source file's own page size and orientation, so combining an A4 report with a US Letter scan or a landscape spreadsheet leaves a document whose pages jump between shapes. That is fine for an internal archive but looks untidy in something you send out.
If consistency matters, standardise the sources before merging — re-export the odd one at the same page size, or rotate a landscape scan — so the final file reads smoothly from start to finish.
Check the result, then fix in one pass
Open the merged PDF and skim the first page, every join between files, and the final page. The joins are where problems hide: a duplicated cover, a blank trailing page, or a section that landed in the wrong place.
If something needs to move or go, use the split or page-organizer tool on the merged file rather than re-merging from scratch, and keep the original files until you have confirmed the combined document is right.