How to Merge PDF Files on Desktop and Mobile

Most of the time, merging comes up because a document arrived in pieces: a scanner saved each page as its own file, or you need to send several related documents as one attachment instead of five. Combining them into a single PDF makes the result easier to read, easier to file, and easier to send.

Open ItsaPDF's Merge PDF tool. Add the PDF files you want to combine — you can select multiple files at once from a file browser, or drag them directly onto the page.

Once your files appear in the list, drag them into the order you want the final document to follow. The order of the list becomes the order of pages in the merged file.

Select Merge PDFs. Your browser does the work locally, and a download link for the combined file appears within moments.

The same tool works in mobile browsers without installing an app. Tap to open the file picker, choose your PDFs from Files (iPhone) or your device storage (Android), and they'll appear in the same reorderable list.

On a touchscreen, reordering works with a press-and-drag gesture. Once the order looks right, tap Merge PDFs and download the result — most mobile browsers will offer to save it to Files or your Downloads folder.

It's easier to get the order right before merging than to split and re-merge afterward. If your files have descriptive names, glance through the list before merging to confirm the sequence matches what you expect.

If a file won't add to the list, confirm it's an actual PDF and not an image saved with a .pdf extension. If a file is password-protected, remove the password using another tool first, since encrypted PDFs aren't supported by the merge tool yet.