Merge PDF Files

1. Add two or more PDF files, or drop a folder of them in.
2. Put them in the order you want using the arrows. The list order is exactly the page order in the result — not the order you selected them in.
3. Merge, then save the combined document.

You can keep adding files after the first selection, so building a document from several folders is straightforward.

Pages are copied from one document into another with their contents intact. Text stays text — selectable, searchable, and sharp at any zoom. Images keep their original resolution. Vector graphics remain vector.

There is no re-encoding step anywhere in the process, which is why merging is one of the few PDF operations that is genuinely lossless.

Page content transfers faithfully. Document-level features are a different matter, and it is worth knowing before you delete your originals:

• Bookmarks and the document outline are generally not carried across.
• Internal links that pointed to specific pages may break, because those pages have new numbers in the merged file.
• Form fields can be dropped, and two documents with identically named fields will conflict.
• Digital signatures are invalidated. This is by design: a signature certifies one exact document, so any change to it must break the seal.

For ordinary documents — reports, scans, invoices, contracts to send on — none of this applies. Keep the originals until you have checked the result.

PDFs carry two different kinds of password, and they behave differently here. A file with an owner password — restrictions on printing or copying, but it opens freely — merges normally. A file with a user password, which demands a password before it will open at all, cannot be merged until you remove that password in your PDF reader.

No limit is imposed. The real constraint is memory, since every document must be open at once while pages are copied. Ordinary text PDFs merge in the hundreds without trouble. Scanned documents are much heavier per page, because each page is a full-resolution image, so very large scan batches are better done in groups.

A large share of the people who need to combine two PDFs are on a computer they are not allowed to install software on: a work laptop under IT policy, a university machine, a library terminal, a borrowed desktop.

Nothing is installed here and nothing needs to be. The page is the program, it runs inside the tab that is already open, and closing the tab is the uninstall. No administrator password, no approval ticket, no trial that expires.

The jobs this comes up for are always the same handful: pages scanned one at a time that need to become one document, a contract whose signed page arrived separately, receipts for an expense claim, statements for a mortgage application, a passport and a proof of address that a form wants as a single upload.

For that last case in particular, check the order before you save. Documents scanned in a feeder often come out reversed, and the list above lets you move any file up or down before merging rather than finding out afterwards.

The documents people merge are contracts, invoices, medical records, bank statements and identity documents for applications. Uploading those to an unknown server means trusting a stranger with the retention, access control and breach history of files you would not email to a colleague.

Here the merge happens inside your browser and no file is transmitted. There is no server copy to retain, no queue to sit in, and nothing to leak — which also means the tool works with your connection switched off.