To combine PDFs using Preview on Mac, open the base PDF in Preview, enable the thumbnails sidebar by clicking View > Thumbnails (or press Command Shift T), open the second PDF in another Preview window with its thumbnails visible, drag the desired page thumbnails from the second PDF into the sidebar of the first PDF to arrange the order, repeat this for additional PDFs, then save the combined file by choosing File > Save or File > Export to preserve the original files.
Combining PDFs using Preview on Mac is simple and doesn’t require any third-party apps. Here’s how to do it step by step:

Open the PDFs in Preview
First, open the PDF you want to use as the base (usually the first one in your desired order) by double-clicking it. It will open in Preview by default.
Show the Thumbnails Sidebar
In Preview, click View > Thumbnails (or press Command Shift T). This will display small previews of each page on the left side of the window. Make sure the sidebar is visible—you need it to drag and drop pages.

Open the Second PDF and Drag Pages
Now, open the second PDF file in Preview (just double-click it). Leave both files open. In the second PDF, make sure its thumbnails are also visible (View > Thumbnails).
Click and drag the thumbnail(s) from the second PDF (or any other PDFs you want to add) into the sidebar of the first PDF. You can drop them anywhere to control the order—drop between thumbnails to insert in a specific spot.

Tip: To add the entire second PDF at the end, drag its first thumbnail and drop it after the last page of the first document.
Repeat for More PDFs
If you have more files to combine, open each one and repeat the drag-and-drop process into the main PDF’s thumbnail sidebar.
Save the Combined PDF
Once all pages are in the correct order, go to File > Save (or File > Export if you want to choose a file size or compression option). Saving will update the original file, so if you want to keep the original unchanged, choose File > Export, give it a new name, and save it as a separate file.
That’s it—your PDFs are now combined. The process is quick once you get used to using the thumbnail sidebar. Just remember:
- Always enable thumbnails (Command Shift T)
- Drag from the sidebar, not the main view
- Save or export when done
Basically, Preview makes this easy if you know where the thumbnail panel is.
The above is the detailed content of How to use Preview to combine PDFs. For more information, please follow other related articles on the PHP Chinese website!

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