pdfpix

Merge PDF files

or drop them here
Choose at least two PDF files first.

Choose two or more PDFs, set their order, and merge them here in the tab. Every page from the first file lands before every page from the second. The result is opened again and checked: page count, page order, page size, and the selectable text on each page against its source. Nothing is uploaded.

How to merge PDF files

  1. Choose the PDFs

    Press Choose PDFs, or drop two or more files on the page. The files are read in this tab and are not sent anywhere.

  2. Put them in order

    Use the arrow buttons to set the file order. Every page from the first file comes before every page from the second, and so on.

  3. Press Merge PDFs

    The browser copies the pages into one new PDF. The progress view replaces the setup while it works.

  4. Read the check, then download

    The merged file is opened again. Its page count, page sizes and selectable text are compared with the source files before the download appears.

Merging PDF files here is free. No account is needed and there is no cap on how often you run it. The page arrives over the web and then works on your own machine, so merging PDF documents online sends nothing to a server.

Page order, and what travels with the pages

The merge is a copy, not a rewrite. Every page from the first file is placed in the output, then every page from the second, in the order the file list shows. Move a file up or down before you press merge and the output follows the new order. Nothing is redrawn, so the text on each page stays selectable and each page keeps the size it had in its source file.

Some things live above the page rather than on it: bookmarks, page labels, named links, attachments and interactive form fields. Those may not survive a page copy. When a chosen file carries interactive form or signature fields, the page shows a notice beside that file before you merge, so you can decide whether to go ahead or keep the original.

Questions

Are my PDFs uploaded to a server?
No. The merge runs in this browser tab. No part of the files is sent anywhere, no account is needed and nothing asks you to sign in.
Which order will the pages use?
The file list is the page order. All pages from the first file come first, followed by all pages from the second file, and so on. You can move a file up or down before you merge.
Does merging keep the text selectable?
Yes. The pages are copied without turning them into pictures. The result is opened again and the selectable text on every page is compared with the matching source page.
What does the merge check cover?
It checks that the result opens, that no page is missing or out of order, that each page keeps its size, and that at least 98% of the source text survived. A failed result is not offered for download.
Can it merge forms, bookmarks or attachments?
Yes. The pages still merge. Interactive fields may stop being editable, and bookmarks, page labels, attachments or named links may not carry into the new file. pdfpix shows a notice beside each affected file before you merge.
How many PDFs can I merge at once?
There is no fixed limit in the page. The practical ceiling is the memory of your browser tab, because every file is held there while the merge runs. Large scanned files reach that ceiling sooner than text documents do.
Does merging make the file bigger?
The output is about the sum of the parts. Merging does not compress anything. If the result is larger than you want, run it through Compress PDF afterwards and name a size in kilobytes.

The other pdfpix tools

All 30 of them run in a browser tab like this one. Each reads its own output back and checks it before offering the download, and none of them needs an account.

Where to go next