How to combine multiple PDFs into one on a Mac using Preview?

To merge multiple PDFs into one file, use Preview on Mac, without third-party software. The specific steps are as follows: 1. Use Preview to open the PDF files that need to be merged, and you can open them one by right-clicking "Open Method>Preview"; 2. Make sure the thumbnail sidebar of the main document is visible. If not, click "View>Thumbnail" in the menu bar or press Command Shift T to open it; 3. Open other PDF files, click and drag the page in its thumbnail sidebar to adjust the insertion position as needed; 4. You can reorder the page order by dragging the thumbnail, or press the Delete key to delete unnecessary pages; 5. After completion, click "File>Save" or "File> Export " to generate a single PDF file; prompt: You can also select multiple PDF files in Finder at the same time, right-click and select Open with Preview, and then drag each file page into the main document to merge, and finally save it as a PDF file.

Combining multiple PDFs into one on a Mac using Preview 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 files you want to combine in Preview , which is the default PDF viewer on macOS.

• Locate your first PDF in Finder.
• Right-click (or Control-click) and choose Open With > Preview .
• Repeat for the other PDFs, or just open one and add the rest later.

Use the Thumbnail Sidebar to Merge Pages

Once your main PDF is open in Preview:

• Make sure the thumbnail sidebar is visible. If not, go to the menu bar and click View > Thumbnails (or press Command Shift T ).
• This shows small previews of each page on the left side.

Now, open another PDF in a separate Preview window, then:

• Click and drag the thumbnails from that second PDF's sidebar into the sidebar of your main document.
• Drop them where you want them to appear in the combined file.

You can drag pages from multiple PDFs into one document, and rearrange the order by dragging thumbnails up or down.

Rearrange or Delete Pages (Optional)

After combining, you can:

• Reorder pages by dragging thumbnails.
• Delete unwanted pages by selecting a thumbnail and pressing the Delete key.

Save the Combined PDF

Once you're happy with the order:

• Go to File > Save (or File > Export if you want to adjust file size or format).
• The result is a single PDF with all your pages in one file.

Tip: If you want to combine many PDFs quickly, you can also:

• Select all the PDFs in Finder.
• Right-click and choose Open With > Preview (this opens them all in separate tabs or windows).
• Then drag pages from each into your main document's thumbnail pane.

That's it—no extra software needed. Just drag, drop, and save.

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