Merge PDF
Combine several PDFs into a single file, in the order you choose. Free, no signup, no watermark — and nothing is uploaded.
Combine PDFs without uploading them
Every mainstream PDF merger works the same way: you upload your files to a server, it joins them, and you download the result. Your documents sit on somebody else’s disk in between. That is a poor trade for a signed contract, a set of invoices, or scanned identity documents. This merger runs on pdf-lib inside your own browser, so the files are read from your disk, joined in memory, and written back out. Nothing is transmitted. You can confirm it in your browser’s network panel, or by disconnecting from the internet once the page has loaded.
Order is the whole job
Merging is trivial; getting the order right is the part people actually care about. The file list shows your PDFs numbered in the exact order they will be joined, and the arrows move them. The number beside each row is its position in the output, not the order you happened to add it in — so what you see in the list is what you get in the file.
What is preserved
Pages are copied whole, so text stays selectable and searchable, images keep their resolution, and page sizes are preserved individually — an A4 document merged with a Letter document keeps both sizes rather than forcing everything to one. Bookmarks, form fields and annotations attached to individual pages may not survive the copy; if you rely on those, check the result before discarding your originals.