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Merging turns several PDFs into one document. The pages are copied in the order you set, and everything on them - text, images, links, form fields - is carried across untouched. Nothing is re-encoded, so the result looks exactly like the originals and there is no loss in quality.

Reach for it when a set of files needs to travel as one: chapters of a report, a scanned contract that arrived as separate pages, an application where the form and the supporting documents must be uploaded in a single attachment, or the front and back of a document your scanner saved separately.

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1. Drop your PDFs onto this page, or use the file picker. You can add more at any time.
2. Drag the files into the order you want, or sort them by name or size. The number on each row is the position it will take in the finished document.
3. Turn on a blank page between files if the result will be printed double-sided, so each document starts on a fresh sheet.
4. Press Merge. Progress shows the page being copied, and Cancel stops it immediately.
5. The download starts on its own. There is no waiting screen and no second click.

Order is the part people get wrong most often, so it is the part this tool makes most visible. Sorting by name uses natural number ordering, which means scan-2 comes before scan-10 rather than after it - the opposite of what plain alphabetical sorting does, and the reason merged scans so often arrive shuffled elsewhere.

Bookmarks are rebuilt rather than dropped. Most merge tools discard the outline because copying pages does not copy the tree that points at them; here the outline of every source is read, its destinations are re-pointed at their new page positions, and the trees are joined under one root. If a bookmark pointed at a page that was not included, its children are promoted rather than lost with it.

The file never leaves your device. The merging happens in a Web Worker inside your browser using pdf-lib, so no page of either document is ever handed to a server. You can confirm this yourself: open your browser's network tab, merge a file, and watch what goes out - one small request asking whether you have tasks left, carrying a tool name and a hash, and never the file.

There is no page limit, no daily quota and no wait between jobs. The only real constraint is your device's memory, and if a file is large enough to be a risk we say so rather than silently refusing.