How to Change the Default PDF Viewer on Mac
If you've installed a third-party PDF app on your Mac — Adobe Acrobat, PDF Expert, Foxit, or anything else — macOS doesn't automatically hand it control over your PDF files. Preview stays in charge until you tell it otherwise. Changing the default PDF viewer is a quick process, but there are a few layers worth understanding before you make the switch.
Why macOS Uses Preview as the Default PDF Viewer
Preview is Apple's built-in document viewer, and it handles PDFs well for everyday tasks: reading, annotating, signing, and basic editing. macOS assigns it as the default handler for PDF files out of the box because it's lightweight, fast, and always present — no installation required.
When you install a third-party PDF app, it doesn't automatically claim that association. This is intentional. macOS respects your existing file associations rather than letting new installs override them silently. That means the change has to be made manually, and it's done at the file level, not through System Settings alone.
The Standard Method: Change the Default via a PDF File
The most reliable way to change your default PDF viewer applies the change system-wide for all PDF files.
Steps:
- Find any PDF file in Finder.
- Right-click (or Control-click) the file and select Get Info (or press Command + I).
- In the Info panel, locate the "Open with:" section.
- Click the dropdown menu — it will show your current default (usually Preview).
- Select your preferred PDF app from the list.
- Click "Change All…" to apply this to all PDF files, not just this one.
- Confirm when prompted.
That's it. From that point, double-clicking any PDF will open it in your chosen application.
Using "Open With" Without Changing the Default
If you only want to open a specific PDF in a different app — without changing the system-wide default — you can right-click the file and hover over "Open With" to select any compatible app. This is useful when you regularly work with PDFs in multiple tools and don't want to commit to a single default.
What Happens in the Browser 🖥️
Changing the default PDF viewer on macOS affects what happens when you open a PDF file directly from Finder. It does not automatically change what happens when you open a PDF inside a web browser.
- Safari has its own built-in PDF renderer and will display PDFs inline by default, regardless of your system default app.
- Chrome and Edge also have native PDF viewers and handle PDFs within the browser window.
- Firefox lets you configure PDF behavior more directly through its Settings > General > Applications panel, where you can tell it to use your system's default app or a specific one.
If your goal is to open browser-downloaded PDFs in your preferred app, the simplest method is downloading the file first and then opening it, rather than trying to force browser-level behavior through the system default setting.
Third-Party Apps and Their Own Defaults
Some PDF applications — particularly Adobe Acrobat — include their own prompts or settings to claim default status during installation or first launch. If you've ever seen a dialog asking whether you'd like to make Acrobat your default PDF viewer, that's the app attempting to handle the association for you.
If you dismissed that prompt or want to reverse it, the same Get Info → Open With → Change All method described above gives you back manual control regardless of what any app tried to configure on its own.
Variables That Affect Which Viewer Makes Sense
Once you know how to change the default, the more meaningful question is which app the right fit for your situation. Several factors shape that answer differently for different users:
| Factor | What It Affects |
|---|---|
| Use case | Casual reading vs. annotation-heavy workflows vs. form filling vs. editing |
| File types | Standard PDFs vs. fillable forms vs. secured/encrypted documents |
| macOS version | Some apps require macOS 12 or later; others support older systems |
| Storage and performance | Heavier apps like Acrobat use more memory and disk space than lightweight viewers |
| Integration needs | Whether you need cloud sync, cross-device continuity, or team sharing features |
| Frequency of use | Occasional readers vs. professionals processing dozens of PDFs daily |
Preview handles a surprisingly wide range of tasks efficiently for most users. But it has real limitations: it doesn't support advanced form workflows, certain PDF/A standards, or the comment/review features that collaborative professional environments often require. Third-party apps fill those gaps at varying levels of complexity and cost.
Reversing the Change
If you switch defaults and want to go back to Preview, the process is identical — right-click any PDF, open Get Info, change the "Open with" dropdown back to Preview, and click Change All. No uninstall or system-level reset required. 🔄
What to Check Before Deciding
The technical steps for changing your default PDF viewer on Mac are consistent across macOS versions (Ventura, Sonoma, and beyond). What varies is how much the choice actually matters for the work you do.
A light reader who occasionally signs documents has very different requirements than someone processing structured forms, reviewing legal documents with markup tools, or collaborating across teams with comment threads. Your macOS version, the types of PDFs you typically handle, and how often you work with them all shape whether Preview's built-in capabilities are sufficient — or whether a more capable app would genuinely change your workflow.