The quickest way to change your PDF opener

Right-click any PDF file on your computer, then select Open with or Open with > from the menu. A list of programs appears — click the one you want to use. Windows will remember this choice and open PDFs with that program from now on.

If the program you want does not appear in the list, select Choose another app (Windows) or Other (Mac), scroll down, and find it. Some programs hide in the full list even though they are installed.

This method works when ready and requires no settings menus. It is the fastest route when you have a PDF in front of you and want to change it right now.

Key Takeaways

  • Right-click a PDF file and select Open with to see programs already set up to open PDFs, then click your choice.
  • If your preferred program does not appear in the quick list, select Choose another app to see all installed programs.
  • Windows and Mac both let you change the default through Settings or System Preferences if you want to set it once for all PDFs.
  • Some programs, like web browsers, may reset your PDF opener when they update, so you may need to change it again later.
  • PDF readers like Adobe Acrobat Reader, Foxit, and Preview (Mac) are designed specifically for PDFs and rarely cause conflicts.

Changing the default through Windows Settings

If you want one program to open all your PDFs by default, use the Settings menu instead of right-clicking individual files. Open Settings, then go to Apps > Default apps. Scroll down until you see PDF listed with your current default program next to it.

Click the PDF entry. A window opens showing all programs that can open PDFs. Click the one you want. Windows updates the default when ready, and every PDF you open from that point forward will use the new program.

This method is more reliable than right-clicking because it sets the rule once, rather than relying on Windows to remember your choice from a single file. It also shows you exactly which program is currently set as default.

Changing the default on a Mac

On Mac, right-click a PDF and select Open With, then choose your program. To make it the default for all PDFs, select the program, then click Change All at the bottom of the menu. Mac will open all future PDFs with that program.

If you want to verify or change the default later, right-click any PDF, select Open With, and look for the program name with (default) next to it. If you want to switch, select a different program and click Change All again.

Mac does not have a central Settings page for file type defaults the way Windows does, so the right-click method is the standard way to manage PDF openers.

Why your PDF opener might change on its own

Web browsers like Chrome, Edge, and Firefox sometimes reset your PDF default when they update. This happens because the browser installer includes a step that sets itself as the default for PDFs. If you prefer a dedicated PDF reader, you may need to change the default again after a browser update.

To prevent this, use a dedicated PDF reader like Adobe Acrobat Reader, Foxit Reader, or Preview (on Mac) rather than your browser. These programs do not typically override your choice during updates. If you do prefer to read PDFs in your browser, you can straightforward change the default back after each update — it takes 10 seconds.

What to do if a program does not appear in the list

Some programs install but do not register themselves as PDF openers. If you have a program that can open PDFs but it does not show up in the Open with menu, the program may not have completed its setup correctly.

Try uninstalling and reinstalling the program. During installation, look for an option that says Set as default PDF reader or Associate with PDF files, and make sure it is checked. After reinstalling, the program should appear in your Open with list.

If it still does not appear, the program may not support PDF opening, or it may be designed only for a specific type of PDF (like forms or scanned documents). Check the program's documentation or website to confirm it handles standard PDFs.

Using a PDF reader designed for your needs

Different PDF programs are built for different tasks. Adobe Acrobat Reader is free and handles all standard PDFs, forms, and signatures. Preview on Mac is straightforward and fast for reading. Foxit Reader is lightweight and does not use much memory. Microsoft Edge has a built-in PDF reader that works well if you already use Edge for browsing.

If you work with PDF forms that need filling, Adobe Acrobat Reader or Foxit are better choices than a browser. If you just read PDFs and want speed, Preview or Edge are sufficient. If you annotate or mark up PDFs regularly, look for a reader that supports highlighting and notes — most paid PDF editors do, and some free readers like Foxit do as well.

The best default is the one you will actually use. If you find yourself opening PDFs in a different program anyway, change the default to match your habit.

Frequently Asked Questions

Can I set different defaults for different types of PDFs?

No. Your operating system treats all PDFs the same way and uses one default program for all of them. If you need to open some PDFs in one program and others in a different program, you will need to right-click and choose Open with each time, or open the program first and then open the PDF from within it.

Why does my PDF opener keep changing back?

Browser updates often reset the PDF default to the browser itself. If this happens regularly, check whether you have recently updated Chrome, Edge, Firefox, or another browser. After an update, change the default back to your preferred program. If it keeps happening, consider using a dedicated PDF reader instead of your browser.

What if I want to open a PDF in a different program just one time?

Right-click the PDF, select Open with, and choose the program you want. This opens that one file in the program you selected without changing your default. Your default stays the same for all future PDFs.

Is it safe to change my PDF opener?

Yes. Changing which program opens PDFs does not affect the files themselves or your computer's security. PDFs are safe to open in any legitimate PDF reader. Stick to well-known programs like Adobe Acrobat Reader, Preview, Foxit, or your browser's built-in reader.

Can I set a PDF opener for just one folder?

No. Your default applies to all PDFs on your computer, regardless of where they are stored. If you need different programs for different folders, you will need to right-click and choose Open with each time.