How to Merge PDF Files on Mac Free (Preview or Browser)

To merge PDF files on a Mac, you have two options that need no extra apps. Preview, which comes with macOS, can combine PDFs by dragging page thumbnails from one file's sidebar into another's. Or open the free PDF merger in Safari or Chrome, add your files, set the order with arrows and download one PDF. Preview is great for picking single pages; the browser tool is quicker for many whole files and never touches your originals.

Method 1: Merge PDFs in Preview

These are the steps Apple gives in its Preview user guide (as per support.apple.com, 2026):

1. Open the PDFs you want to combine in Preview.
2. In each open PDF, choose View > Thumbnails to show the page thumbnails in the sidebar.
3. Drag the thumbnails you want from the sidebar of one PDF into the sidebar of the other. You can drop them at the end or between pages, and drag thumbnails to reorder them.
4. To pick pages that aren't next to each other, Command-click each one before dragging.
5. To add a whole PDF, drag its icon from the Finder into the sidebar of the open document.

One important warning from Apple: Preview saves changes to a document automatically. If you drag pages into your original contract or statement, that file is changed. Choose File > Duplicate first on the file you're adding to, and work on the copy.

Where Preview is awkward

Preview works well, but a few things trip people up:

• Long jobs. Dragging ten files one by one into a sidebar, and dropping each in exactly the right gap, takes care. A slip drops pages in the wrong place.
• Thumbnails are small. With 40 or more pages it's hard to see where one document ends and the next begins.
• Auto-save. If you forget to duplicate, there's no separate "merged" file; your original is now the merged one. (You can usually go back with File > Revert To, but it's easy to miss.)
• Hidden mistakes. Where a dropped page lands depends on exactly where you let go, and a page dropped one slot off is easy to miss in a long sidebar.

Method 2: Merge PDFs in your browser

If you'd rather see a numbered list of files and press arrows, use the free PDF merger in Safari, Chrome or Firefox:

1. Click Choose PDF files and select your PDFs in the Finder window. Hold Command to select several, or drag them from a Finder window onto the page.
2. Each file appears in a numbered list with its size. Use ↑ and ↓ to set the order, and Remove to take one out. Add more PDFs adds files from another folder.
3. Click Merge N PDFs (the button shows how many files you've added).
4. When it's done you'll see the total pages and size. Click Download merged PDF.

Safari saves the file as merged.pdf in your Downloads folder. Your original PDFs aren't touched, so there's nothing to duplicate first.

The limits: up to 30 files at a time, each up to 100 MB. Password-protected PDFs need the password removed first; Unlock PDF can do it if you know the password (a pro tool; a free account can try it on a PDF up to 2 MB). The merging runs on your Mac in the browser, so nothing is uploaded, which also means it works the same on a slow connection.

Which way to merge PDF on Mac

You want to	Use
Combine 2-3 short PDFs	Either; Preview is already open
Combine many whole files in a set order	Browser merger
Take page 3 from one file and drop it into another	Preview
Keep your originals untouched without remembering to duplicate	Browser merger
Do the same job on a Windows PC or phone later	Browser merger works the same everywhere

To take only some pages with the browser method, cut them out first with the free PDF splitter, then merge the pieces. Our guide to inserting a page into a PDF walks through that.

Tips for Mac users

• Name files for order. Rename files 01-cover.pdf, 02-letter.pdf and so on. Finder sorts them by name, so they arrive in the merger already in order.
• Fix sideways scans before merging. Preview's rotate buttons work, but a rotation only sticks if the file is saved. The free PDF rotator saves the rotation into a new file, so every viewer opens it upright. See how to rotate PDF pages.
• Photos from your iPhone? AirDropped photos often arrive as HEIC. Open them in Preview and use File > Export to save a JPEG copy, then turn the JPGs into a PDF with the free JPG to PDF converter and merge.
• Check the result in Quick Look. Select merged.pdf in Finder and press the Space bar to scroll through it without opening an app.

If you're also on a Windows PC at work, the browser method is the same there; see merging PDFs on Windows. For general tips on page order and file limits, read how to merge PDF files.

Merge your PDFs now

Open the free PDF merger in Safari, drop in your files, put them in order and download one PDF. It's free, needs no app or sign-up, and your files stay on your Mac.