Several documents in,
one document out.
Drop in the PDFs, put them in the order you want them read, and take away a single file. The pages, text, links and bookmarks are copied across as they are — nothing is re-rendered, and nothing is sent anywhere. A file that asks for a password can be merged too: type it on its row.
This browser can't run this tool
It needs WebAssembly, which every current browser has.
Drag a row by its handle, or use the arrows, to change the order. They are joined top to bottom.
The first PDF you open here downloads a 1.3 MB engine. After that this tool works offline too.
A conventional online converter takes your file, puts it on someone else's disk, does the work there and lets you download the result. Two copies of your file then exist somewhere you cannot see, for as long as that company decides. Here the code that does the work is shipped to your browser instead of your file being shipped to a server: the bytes are read by this tab, transformed in memory, and written back out as a download. Our server never sees them, so there is nothing for us to keep, log or lose.
One thing is counted, and here it is: when a tool finishes, this page tells the server which tool ran and whether it worked — never the file, its name, its size or anything read out of it, none of which ever leaves this tab. It is how we know which tools are worth keeping. The record is the same kind we keep for a one-time link: a truncated IP address, a country and a region.
Once the page has loaded, these tools keep working with the network switched off. That is the simplest proof that nothing is being sent anywhere.
Frequently Asked Questions
Q: Are my PDFs uploaded anywhere?
No. They are read by this browser tab and joined here, by a WebAssembly build of qpdf that runs on your machine. Nothing is sent to our server — you can disconnect from the network after the page loads and the tool still works.
Q: How do I control the order?
The list is the order. Drag a row up or down, or use its arrows; the files are joined from top to bottom, and the page count next to each one tells you what you are moving.
Q: Does merging change the documents?
No. Pages, text, fonts, images and links are copied across untouched. Nothing is re-rendered or recompressed, so the result is the same size as its parts, give or take the shared structure.
Q: Can I merge a password-protected PDF?
Yes — type its password on its row. The merged file comes out without the password, since a single document cannot be half-encrypted.
Q: How many files can I join?
As many as your device can hold in memory at once. There is no server limit because there is no server involved.
The same idea, applied to sending things rather than changing them.