Merge PDF

Pick two or more PDFs and they become a single document. The files stack in the order you add them, and the merged result appears on the right so you can page through it before downloading. Drag more files in at any time and they join the end of the list.

How do I get the files in the right order?

The list keeps the order you added the files in. Each row has an up and a down arrow to move that file, and an X to drop it. Every change rebuilds the merged PDF, so what you see in the preview is what you get in the download.

Each row also shows the file’s page count and size, which helps when two scans have similar names. The merged document takes all the pages of the first file, then all the pages of the second, and so on.

If you merge a single file, the download keeps that file’s name. With several files the result is called merged.pdf.

Does merging change the pages?

Pages are copied over as they are. A page keeps its own size and rotation, so an A4 report followed by a US Letter invoice comes out with an A4 page and a Letter page rather than one size forced on both. Text stays text, and images are not re-compressed.

Password-protected PDFs can’t be opened here, and a damaged file will be reported instead of silently skipped. If a file is rejected, remove it and try again with a version that opens normally in a PDF reader.

Are my files uploaded anywhere?

No. The merge happens in the page itself, using pdf-lib, which runs in your browser. Nothing is sent to a server, so a signed contract or a stack of bank statements stays on your machine. The preview uses your browser’s own PDF viewer on a copy held in memory. Close the tab and everything is gone.

PDF is an open standard, ISO 32000, which is why the same file opens the same way across readers.

Most people reach for this when a form only accepts one attachment: a scanned passport plus a proof of address, a month of receipts for an expense claim, or the chapters of a report that were written separately.