Merge PDF
Merge PDF files into one document in the order you set, with each file's bookmarks and filled form fields carried across and a bookmark added for every file.
The merged document
PDFs
Drop PDFs here
Two or more · whole files, in the order you arrange them — nothing uploads
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The order
Pages
What the merge carries
One PDF
How to use
- Drop the PDFs on the box or press Choose files. Add more at the foot of the list brings in another, and it joins the end.
- Put them in order with each row's grip. Drag it, or focus it and press the arrow keys; the number in front of each name is its place in the finished file.
- Tick Number the merged document if the pages need numbers, then pick a format and press one of the nine spots on the page grid.
- Press Merge PDFs. A bar names the file being copied, and Cancel stops it with the list left as it was.
- Look over the result in the page well, then press Download. Changing the list or the numbers afterwards turns the button into Merge again.
About this tool
Merge PDF files the way you'd sort a paper stack. Add everything at once and each file becomes a numbered row saying what it brings: pages, size, how many bookmarks and how many filled form fields. Drag a row by its grip, or focus the grip and use the arrow keys, Home and End. The page total above the button moves as the list does, so you know how long the finished document is before anything is written.
Press Merge PDFs and the result opens on the page instead of downloading straight away. A rail of thumbnails runs along it, and the first page of every file carries that file's name. Check the seams there before you press Download. Bookmarks come across too: each file gets one of its own, with the bookmarks it already had tucked underneath. Filled forms keep their answers, and when two files use the same field name, the later one is put under its file's name so the two values never overwrite each other.
What a real merge looks like
Say an 8-page contract with three bookmarks, a 3-page annex with two filled fields and a one-page scanned receipt. The rows read 8 pages · 3 bookmarks, 3 pages · 2 filled form fields and 1 page, and the total says 12 pages from 3 files. Merging gives contract-2026-merged.pdf: the rail marks pages 1, 9 and 12, and the result counts 6 bookmarks and 2 fields.
If the annex was saved with an open password, its row says so and the button changes to Merge 2 PDFs. The other two still merge, and Unlock signed-annex.pdf takes you to the tool that removes the password.
Good to know
- Whole files only. Every page of every source goes in, in list order. To pull pages 3 to 7 out of one of them first, Split & Organize PDF does that, and the result comes back here.
- A file that needs a password to open can't be merged until it is unlocked, and a signature that was valid in one of the sources will not validate in the merged copy, because the bytes it signed have changed.
Frequently asked questions
Do bookmarks survive the merge?
Yes. Each file gets a top-level bookmark with its name, pointing at its first page, and the bookmarks it already carried sit under it, still pointing at the same pages in their new place.
What happens to filled form fields?
They come across with their values and stay editable. If two files both have a field called signer.name, the second one becomes witness-form.signer.name, named after its file, so filling one never changes the other.
Can I put the same PDF in twice?
Yes, on purpose. Nothing filters duplicates out, so the same divider page can go between every chapter by adding it again each time.
One of the files is password-protected.
Its row says it needs its open password and the rest still merge. Unlock PDF removes the password if you know it; add the unlocked copy back to the list and it joins in.
Does the numbering restart for each file?
No. Numbers are stamped on the merged document, so a three-file merge counts 1 upward across the whole thing. Numbers already printed on the source pages stay where they were, since merging copies pages rather than redrawing them.
Does merging squash the scans or drop image quality?
Pages are copied object by object into the new document rather than re-rendered, so a scanned page keeps the resolution and compression it arrived with. Nothing is stamped on top either, apart from page numbers if you asked for them.
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