Combining PDFs is mostly about order and naming. Do both deliberately and one merged file is easier to share, submit, and find later.
The merged file reads in the order the files sit in the list — number the sources and the result follows.
Merging PDFs sounds trivial until the filename problem catches up with you. The files combine fine — but if the pages are jumbled or the result is named “final-final.pdf”, you've traded several files for one you can't find.
Order is the whole job
The merged document reads in exactly the order the files sit in the list. That's the one decision that matters, and it's easy to get wrong on page 3 of a 20-page merge.
A practical habit: number the source files before merging — scan-1.pdf, scan-2.pdf, scan-3.pdf — so the list order matches the reading order and is obvious at a glance.
When merging is the right move
Merging is the right move when the combined file has one job: a single submission, a single share link, one attachment an examiner or a client actually opens. Three related documents with three names is three chances for one of them to be missed.
Step by step
The whole job, in order:
- Open the GainUtility PDF merger.
- Add the source files in reading order — if it matters, rename them with numbers first so there's no guesswork.
- Drag to reorder in the list if anything lands wrong.
- Merge and download, then rename the result with the subject first: scan-all.pdf instead of final.pdf.
- Open the merged file once and flip through it before sending it anywhere.