This tool joins several PDFs into a single document — scanned pages that arrived one file at a time, a contract and its appendices, chapters that need to become one report. Pages are copied exactly as they are, so text stays selectable, links keep working, and nothing is re-encoded or re-compressed along the way. The whole merge is done inside your browser with no upload, which matters when the documents are contracts, medical records or anything else you would rather not hand to a stranger's server.
No. Each PDF is read from your device, and the pages are copied into a new document built in the page. No part of any file is sent over the network.
No. Pages are copied at the object level, not re-rendered, so images keep their original resolution and text stays as text. The merged file is roughly the size of the originals added together.
A file that only restricts editing or printing can usually be merged. A file that needs a password just to open cannot be read here — remove the password in the application that created it first.
There is no fixed limit, because nothing is uploaded. The practical ceiling is your device's memory: merging a few dozen ordinary documents is fine, while hundreds of image-heavy scans may run out of room in the browser tab.
Page content, links and annotations are carried over. Document-level structures such as outlines, form fields and attachments may be dropped, because they belong to the original file rather than to individual pages.