How to combine PDFs in the right order
A merge joins whole documents in file order. It does not sort their contents by date, remove duplicates or choose which pages belong in your submission. Decide the sequence before opening Merge PDF.
Try a merge you can check
Download the two-page practice PDF and its A4 version. Add the Letter source first and the A4 version second. Choose Merge PDFs. The result should have four pages: two Letter pages, then two A4 pages. The wording intentionally repeats because the second file is a resized version, not an extra section.
- Choose two or more unencrypted PDFs, up to 100 files and 50 MB combined.
- Use the arrows beside the filenames to put the files in order. Inspect the first page of similarly named files before merging.
- Download the merged PDF. Open its preview and check the transition between each pair of source files.
- Confirm that the output page count equals the sum of the input counts. A merge does not automatically remove a repeated cover.
Download the four-page result produced by this browser workflow and compare it with your own run. Check page sizes as well as wording.
Whole files, selected pages or a contents page?
For pages 2–4 from a longer appendix, extract that section first, then merge it. For page order such as 3, 1, 2 inside one PDF, use Organize PDF. For labelled sections and a new clickable contents sheet, follow the separate application-pack workflow.
Check document features, not only page appearance
A correctly displayed page does not establish that document-level bookmarks, tags, form fields or signatures survived. Keep signed originals. If a recipient needs an interactive form or accessible tagged document, use its recommended workflow and verify those features after merging. A merged file can also exceed an upload limit; check its size before submitting.
A practical handoff check
Open the downloaded copy rather than the original. Check its cover, each section boundary and final page, then use a filename that identifies the finished version. Follow the recipient's document-order rules even if a different order looks neater.
Updated October 29, 2026 · PDF Tools Club. Examples use synthetic documents; keep your own originals.