PDF tool
Merge PDF
Drop in as many PDFs as you like, put them in the right order, and get one file back. The work happens in this page — the documents are never sent anywhere.
Drop PDF files here
Or press to choose them. Add more at any time.
nothing is uploaded — this page does the work
What this actually does
Each document you add is opened, its pages are copied into a new empty document one after another, and the result is saved. Nothing is re-encoded and nothing is re-compressed, so the pages come out byte-for-byte as good as they went in — the merged file is usually within a few percent of the sum of the originals.
The order in the list is the order in the output. Move a file up or down before you press Merge; there is no way to reorder afterwards short of splitting the result apart again.
When you would use it
- Scanned paperwork that arrived in pieces. A contract signed page by page, or a set of receipts photographed one at a time and converted separately.
- A submission that must be one file. Grant portals, visa applications and job boards frequently accept exactly one PDF and reject a zip.
- Chapters into a book. Anything written in parts and exported separately.
- Putting a cover on something. Merge a one-page cover sheet in front of a report.
What it will not do
Password-protected files. If a document needs a password to open, this tool refuses it and says so. It does not ask you for the password, and it should not: a page that asks for a document password is asking for a credential, and this site has decided not to be in that business at all. Remove the protection in the application that made the file, then merge.
Interactive form fields survive, but not always intact. Two documents that both contain a field called name end up with a name collision in the merged file, and some readers will then tie the two fields together so that typing in one fills the other. If you are merging filled-in forms, flatten them first.
Digital signatures are broken by merging. That is not a bug in this tool; it is what a signature is for. Any change to a signed document invalidates the signature, whichever software makes the change.
Bookmarks and links between documents are lost. Page content is copied; the document-level outline is not. An internal link that pointed to page 4 of the second document will not follow it to its new page number.
Why it is free, and why there is no upload
Merging a PDF is a structural edit — it copies objects from one file into another and rewrites the cross-reference table. That needs no model, no rendering and no meaningful amount of memory, and a browser from the last five years does it faster than the round trip to a server would take. So there is no server involved, no queue, no file size limit set by somebody else's disk, and no cost to us in running it. Your files stay on your computer because there is no endpoint on our server that could receive them.
The practical limit is your own device. A phone with a couple of hundred megabytes of documents open at once will start to struggle; a laptop will not notice.