Merge PDF - Frequently Asked Questions

The Merge PDF tool combines several PDF files into one document. You can:

• Add several PDFs at once and see a thumbnail of every page.
• Tick only the pages you want to keep from each file.
• Drag pages into any order, including mixing pages from different files.
• Download one merged PDF, free and without signing up.

Yes. "Process locally (no upload)" is switched on by default. Your PDFs are merged in your browser and never leave your device.

Local mode works best when the files add up to less than about 100 MB. For very large files, or on an older device, you can switch local mode off. The files are then uploaded over an encrypted connection, merged on our server and deleted after processing.

There is no fixed limit. For the smoothest experience, merge up to about 20 files at a time and keep each file under 100 MB. If you have more, merge them in groups and then merge the results.

Yes. After you add your files, every page appears as a thumbnail with a checkbox. Untick the pages you do not want. Use Select / Deselect All to start from all pages or from none.

Drag any page thumbnail to a new position. The merged PDF follows the order you see on screen, so you can put a page from the third file before pages from the first. On phones and tablets, press and hold a thumbnail, then drag it.

Tip: name your files in the order you want them, such as 01-cover.pdf and 02-report.pdf, before adding them.

No. Pages are copied as they are, so text stays sharp and selectable and images keep their original resolution. Page sizes and orientations are also kept, so you can mix A4, Letter, portrait and landscape pages.

Interactive extras from the original files, such as bookmarks and fillable form fields, may not be carried over to the merged PDF.

Not directly. Remove the password first with Unlock PDF (you need to know the password), then merge the unlocked files. You can add a password to the merged file afterwards with Protect PDF.

Yes. It works in modern browsers on Android phones, iPhones and tablets. You can pick PDFs from your files, tick pages and drag them into order by touch. With many files or pages, a larger screen is easier to work on.

In local mode, which is the default, your files never leave your device. In server mode, files are kept only temporarily to create your merged PDF and are then deleted. We never sell or share your documents. See our privacy policy for details.