How to Merge PDF Files on Mac
Three free methods — no Adobe Acrobat needed. Mac has a built-in PDF merging tool in Preview that most users don't know about.
Prefer a browser tool? Works on any Mac browser.
Merge PDF Free →Method 1: macOS Preview (Built-in, No Download)
Preview is the default PDF viewer on every Mac and has had PDF merging capability since macOS 10.6. No downloads, no accounts.
- 1Open the first PDF in Preview by double-clicking it.
- 2Go to View → Thumbnails to show the thumbnail sidebar on the left.
- 3Open Finder and locate the other PDF files you want to merge.
- 4Drag the additional PDFs from Finder into the Preview thumbnail sidebar. Drop them at the position you want — between pages, at the start, or at the end.
- 5Go to File → Export as PDF. Choose a filename and click Save.
âš ï¸ Use File → Export as PDF, not File → Save. The Save option may not include the newly added pages in some macOS versions.
Method 2: Browser Tool (Works on Any Mac Browser)
If you prefer a visual drag-and-drop interface, the browser-based merge tool works on Safari, Chrome, Firefox, and Edge on Mac. Files are processed locally — nothing is uploaded.
- 1Go to irreva.app/merge-pdf.
- 2Click or drag to upload your PDF files.
- 3Drag rows to reorder if needed.
- 4Click Merge PDF.
- 5Download the merged file.
Method 3: Terminal (For Developers)
macOS includes a Python-based PDF utility accessible from Terminal. This is the fastest method if you're comfortable with the command line.
python3 -m ensurepip --upgrade
python3 -m pip install PyPDF2
# Then merge:
python3 -c "
from PyPDF2 import PdfMerger
m = PdfMerger()
m.append('file1.pdf')
m.append('file2.pdf')
m.write('merged.pdf')
m.close()
"Alternatively, pdftk via Homebrew is a simpler CLI option: brew install pdftk-java && pdftk file1.pdf file2.pdf cat output merged.pdf
Frequently Asked Questions
Does macOS Preview merge PDFs without quality loss?
Yes. Preview copies pages directly from the source PDFs without re-encoding or compressing content. The merged file is identical in quality to the originals.
Can I reorder pages when merging with Preview?
Yes. In the thumbnail sidebar, you can drag pages to any position before saving. Hold Command to select multiple pages.
Which method is best for confidential PDFs on Mac?
Both Preview and the browser-based tool are fully local — your files never leave your device. The browser tool is slightly more straightforward for beginners; Preview is faster if you're already comfortable with it.
Can I merge more than 2 PDFs?
Yes. All three methods support unlimited PDF files. Preview lets you open the first PDF, then drag additional files' thumbnails into the sidebar. The browser tool accepts multiple files at once.