merge PDF
☞ runs entirely in your browser — nothing is uploadedDrop your PDF files here
or click to browse — up to 20 files, 100 MB each
OneImageTool
Free Image Tools
merge PDF
Combine PDF files into a single document. Put them in the order you want, see how many pages each one adds, and download the result — all without uploading anything.
or click to browse — up to 20 files, 100 MB each
nothing leaves your device
Most PDF merge sites work the same way: you hand over your file, a server does the work, and you trust a privacy policy about when the copy gets deleted. For a contract, an invoice batch or a set of medical scans, that is a strange trade to make for an operation that is mostly just copying page objects from one file into another.
This tool does the copying in the browser tab you already have open. Your files are read with the File API, assembled with pdf-lib in memory, and handed back to you as a download. There is no upload step to opt out of, and the page keeps working after you go offline.
three steps
Drop in up to 20 PDFs — each one is checked and its page count shown.
Move files up or down; the list is the order of the finished document.
One PDF with every page, in that order.
quick answers
No. Every file is read and merged inside your browser. Nothing is sent to a server, which is also why the tool keeps working with your network disconnected.
Up to 20 files of 100 MB each. The real limit is your device's memory: merging peaks at roughly three to four times the combined file size, so a very large batch is better done in two rounds.
Page content, images and fonts are carried over exactly. Document-level structures — outlines, the table of contents and form field data — are not copied, because they belong to the file as a whole rather than to individual pages.
Not yet. Encrypted files are rejected as they are added, with a message saying so, rather than failing halfway through the merge. Remove the password in your PDF reader first, then merge.
No. Every page keeps its own size and orientation, so an A4 report followed by a landscape scan stays exactly that. Nothing is scaled or re-encoded.
No. Pages are copied, not re-rendered — text stays selectable, images keep their original resolution and compression.