Merge PDF

No. The page loads a PDF library into your browser and does the work there. Your files are read from disk by the browser, changed in memory and handed straight back to you as a download. No part of them is sent over the network, and there is nothing on our side that could keep a copy.

Most of them upload your file to their servers, process it there and delete it later — typically after an hour or so. That means your document sits on someone else’s computer for a while. Here it never leaves the tab, so there is nothing to delete.

Only what your device can hold in memory. There is no upload, so there is no upload limit, but a very large merge on a phone may be slow or run out of memory. Desktop browsers handle a few hundred megabytes comfortably.

Not yet. A PDF that needs a password to open cannot be read, and the tool will tell you so instead of failing silently. Remove the password in your PDF reader first.