Merge 2 PDF Files 2026 — Free Online

Combine two PDFs into one. The order they end up in is the order you add them, and you can drag either one to swap it before merging. Nothing is uploaded — the files are read and rewritten inside this tab.

Order is the thing to get right

With two files there is only one decision to make and it is easy to make backwards. The file at the top of the list becomes the front of the document; drag either one to change it before you merge.

The common cases run in a predictable direction. A covering letter goes in front of a report. A signed signature page goes behind the agreement it belongs to. A bank statement for March goes after February. If you are not sure, the page count shown against each file usually settles it.

Nothing is altered on the way through. Pages are copied rather than re-rendered, so text stays selectable, images keep their resolution, and a scanned page comes out exactly as it went in.

  • Top of the list is the front of the merged document
  • Drag to swap before merging; there is no undo afterwards
  • Pages are copied, never re-encoded

When the two files do not match

Different page sizes are fine and more common than people expect — an A4 report with a Letter-sized appendix merges without complaint. Each page keeps its own dimensions, so the result has pages of two sizes rather than one stretched to fit the other.

That is the right behaviour for archiving and for printing to a printer that respects page size, and it is worth knowing before you send it to someone who will print it on a single tray.

Orientation behaves the same way. A landscape spreadsheet page keeps its orientation inside a portrait document.

What comes out the other side

One file containing every page of both, in the order shown, with a contents entry for each source file so you can jump between them in any reader's sidebar.

If either file had bookmarks of its own, those come across too, nested under the file they belong to and pointing at the right pages in the merged document.

Frequently Asked Questions

Which file ends up first?

The one at the top of the list, which is the one you added first. Drag either file to change the order before merging.

Can I merge PDFs of different page sizes?

Yes. Each page keeps its own dimensions, so an A4 document merged with a Letter-sized one produces a file with pages of both sizes rather than stretching either.

Does merging reduce quality?

No. Pages are copied rather than re-rendered, so text stays selectable and images keep their original resolution. Merging the same file repeatedly does not degrade it.

Can I undo a merge?

The merged file is new and your originals are untouched on your machine, so there is nothing to undo — merge again in a different order if you got it wrong.

Is there a file size limit?

None imposed here. Nothing is uploaded, so there is no service tier and no queue; the practical limit is your own machine.

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