How to Combine Multiple PDFs Into One File

Job applications, contract packages, invoices with supporting docs — at some point you end up with related files scattered across separate PDFs that need to go out as one. Merging them is quick. Which method makes sense depends on what you have available.

Fastest option: use a browser tool

EditPDF's merge tool runs entirely in your browser — the files never leave your device. Add them, drag into the right order, click merge, download. About 30 seconds once everything is open.

Order matters. Double-check before you click merge, because fixing it afterwards means starting over.

On a Mac: Preview does this for free

Open the first PDF in Preview, go to View then Thumbnails to get the sidebar, then drag another PDF's file icon from Finder directly into that sidebar at the position you want it. Add more files the same way, then File and Export as PDF.

Nothing in the Preview interface suggests this is possible, which is why most people don't know about it. But it works completely offline and it's fast once you know the trick.

Two things worth checking before you send

Scroll through the merged file. Confirm the page count adds up. A blank page, a missing section, or a file that merged in the wrong orientation is easy to miss when you're moving quickly.

Check the file size. Merging large PDFs just adds their sizes together, and if the combined file is over 10 MB you may hit email limits. Running it through EditPDF's compressor afterwards usually brings it down significantly without any visible change.