Support: Merge PDF

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Common questions

Are my PDF files uploaded anywhere?

No. The files are combined by your own browser on your own device. They are never sent to our server or anyone else's, which is different from most online PDF sites that upload your files to process them.

How do I merge PDF files?

Choose or drop your PDF files into the box, drag them into the order you want, and press Merge PDFs. The combined PDF downloads straight away.

Is there a limit on how many files or pages?

There is no set limit. Because the work happens on your own device, very large jobs are limited by its memory: dozens of ordinary documents are fine, but a few hundred large scanned files at once may be too much for a phone.

Can I merge password-protected PDFs?

Not until the password protection is removed. A protected file will be marked in the list so you know which one it is.

Will the text still be searchable and sharp?

Yes. Pages are copied exactly as they are, not turned into images, so text stays selectable and searchable and nothing loses quality.

Are bookmarks, links and form fields kept?

Yes. Each file gets its own bookmark in the merged PDF, with that file's bookmarks inside it, links that jump to another page still go to the right page, and form fields stay fillable (a field whose name is already used gets a number added so both keep their values). Digital signatures will no longer be valid, because the document has changed.

Why is the merged PDF smaller than the files added together?

Files made by the same app often contain the same fonts and images. The merged PDF stores each of those once and trims fonts down to the characters used, without changing how anything looks.

Can I merge PDFs on my phone?

Yes. It works in Safari on iPhone and Chrome on Android. Use the arrow buttons to change the order, since dragging is awkward on a small screen.

Is it free?

Yes, completely free, with no sign-up, no watermark and no limit on use.

Nothing happens when I pick a file

The tool runs entirely in your browser, so a very old browser can fail silently. Try the current Chrome, Edge, Firefox or Safari. Your files are never uploaded anywhere.