Merge PDF files into one
Drop in your PDFs, arrange the order, and download a single merged file. Everything happens in your browser — nothing is uploaded.
✓ No credit card✓ No email✓ No ads✓ Free
Drop PDF files here or click to browse
🔒 100% private — your files never leave your device.
Frequently asked questions
Are my PDF files uploaded to a server?
No. When you add a file, the browser hands the page a local reference to it (the File API) — the page never sends those bytes anywhere. There is no upload code on this site at all: the server only delivers the page to you, and its job ends there.
How does the merging work then?
The merging is done by pdf-lib, a PDF library written in JavaScript that runs entirely in your browser. It reads each PDF from your computer's memory, copies all pages into a new document, and assembles the merged file — all locally, using your device's CPU.
Where does the downloaded file come from, if not a server?
The merged PDF is built in your browser's memory and exposed as a temporary blob: URL — an address that points at data inside your own browser, not on the internet. Clicking download simply saves that in-memory data to your disk.
Do you store or see my files?
We can't — the files never reach us. The page also uses no storage, so when you close the tab, the source files and the merged result are gone. The only thing we measure is an anonymous page view (via Umami analytics), which contains no file names or contents.
Is it really free?
Yes — free, with no credit card, no email, no sign-up, and no ads. Since your device does the work, merging costs us nothing per file.
Is there a file size or page limit?
No hard limit — the practical limit is your device's memory, since everything is processed locally. Typical documents merge in a second or two; very large PDFs (hundreds of MB) may take longer.