Merge PDF
Combine several PDFs into one, reordering or dropping pages first. Your files never leave your device.
Merge PDF joins several PDFs into a single file, in the order your file list shows, and you drag a row to change it. Open the page organizer to reorder, turn or drop single pages across every file first. The output is named merged.pdf unless you rename it. Bookmarks and form fields live on the document, so the merge drops them.
Questions
What order do the PDFs end up in?
The order shown in the file list, top to bottom, and each document contributes all of its pages before the next one starts. Drag a row, or use the arrows beside it, to change that order before you run the merge.
How do I reorder or drop individual pages?
Open the page organizer once your files are in. Every page of every file appears as a thumbnail you can drag into any position, turn a quarter turn, or delete. The merge follows that arrangement, so pages from two files interleave freely instead of one file landing after the other.
Is there a limit on how many PDFs I can merge?
No fixed limit. Every file is held in your browser's memory while it merges, so the practical ceiling is your own device, a few hundred MB of PDFs is unremarkable on a laptop, and a phone will give up sooner.
Does merging re-compress or degrade the pages?
No. Pages are copied across as they are, with their existing fonts and images intact. The merged file is usually close to the sum of the inputs, merging is not a compression step, and if you want one, run Compress PDF afterwards.
Can I merge a password-protected PDF?
Not while it is still encrypted. Run Unlock PDF on it first with the password you have, then merge the unlocked copy.
What happens to bookmarks, form fields and annotations?
Page content, including annotations attached to a page, is copied. Document-level structure that does not belong to any one page, the outline (bookmarks) and the AcroForm field catalogue, is not carried into the new document, because the new document is built page by page.
Does Merge PDF upload my files?
No. It runs in a Web Worker in this tab using pdf-lib, and nothing is sent anywhere. You can watch the request counter on the homepage stay at zero while you use it, or turn off your network and merge anyway.