Learn how to add page numbers to PDF files using free online tools or PC software. You can set position, font, etc., for page numbering.

Step 2: Drag your PDF files into the "Merge PDFs" box or click the "Select Files" button to add files.

You're able to build PDFs in the Preview tool too: As long as you have a PDF open in Preview, you can drag any file type into the table of contents sidebar on the left to add it as an extra page.

The files will begin to upload to PDF Joiner (this could take a few minutes, depending on how many and how large your files are). Click Join Files in the bottom right-hand corner of the screen.