The fastest way to open a PDF depends on what device you have

On Windows, right-click the PDF file and select "Open with" — Windows will show you every program installed that can read PDFs. The default is usually Microsoft Edge or Adobe Reader. On Mac, double-click the PDF and it opens in Preview, which is built in. On iPhone or Android, tap the file in your Files app (or wherever you downloaded it) and it opens in your phone's default PDF reader, usually the same app that handles email attachments.

If you want to change which program opens PDFs by default, that takes one extra step on each system. But for a one-time open, the quickest route is always the right-click or double-click method on your computer, or a tap on your phone.

Key Takeaways

  • Windows and Mac both have built-in PDF readers — Edge on Windows and Preview on Mac — so you do not need to install anything.
  • On any device, double-clicking or tapping a PDF file opens it in whatever program is set as the default.
  • If you want to open a PDF in a different program than the default, right-click (Windows) or Control-click (Mac) and choose "Open with" from the menu.
  • Adobe Reader is free to download if you want more editing tools than the built-in readers offer, but most people only need to view PDFs.

Opening a PDF on Windows

Double-click the PDF file. Windows will open it in Edge, which is the default PDF reader on most Windows computers. If you want to use a different program, right-click the file instead, then select "Open with" and choose from the list. The programs shown depend on what you have installed — Adobe Reader, Google Chrome, and Firefox all appear if they are on your computer.

To change which program always opens PDFs, right-click any PDF, select "Open with," then click "Choose another app." At the bottom of the window, check the box that says "Always use this app to open PDF files," then click the program you want. From that point on, all PDFs will open in that program by default.

Opening a PDF on Mac

Double-click the PDF file. It opens in Preview, the built-in Mac PDF reader. Preview lets you view, rotate, and search PDFs, and you can also mark them up with notes and highlights without installing anything else.

If you want to open a PDF in a different program, Control-click the file, select "Open With," and choose from the list. To change the default, Control-click a PDF, select "Open With," then click "Other." Find the program you want to use, click it, then click "Always Open With." Every PDF will now open in that program instead of Preview.

Opening a PDF on iPhone or iPad

Tap the PDF file in the Files app, Mail app, or wherever you downloaded it. It opens in your phone's default PDF reader — usually the Books app or a mail-specific reader. You can view, search, and highlight text without installing anything.

If you want to open PDFs in a different app, tap and hold the file, then select "Open With" and choose another program. To change the default, go to Settings, scroll down to the app you want to use, tap it, then look for a "Default PDF Reader" or similar option. Not all apps offer this setting, so check the app's own settings if you do not see it in the main Settings menu.

Opening a PDF on Android

Tap the PDF file in your Files app, Gmail, or wherever you downloaded it. It opens in your default PDF reader, usually Google Drive, Google Play Books, or a file manager's built-in viewer. All of these let you view and search PDFs without extra steps.

To open a PDF in a different app, tap and hold the file, select "Open With," and choose another program. To change which app opens PDFs by default, tap and hold a PDF, select "Open With," then look for an option that says "Always" or "Set as Default." This option does not appear on all Android versions, so if you do not see it, you can change the default in Settings by going to Apps, finding the PDF reader you want, and looking for a "Default Apps" or "Set as Default" option.

When you need more than just viewing

The built-in readers on Windows, Mac, and phones let you view PDFs and usually search and highlight them. If you need to edit text, add form fields, or combine multiple PDFs into one file, you will need a different program.

Adobe Reader (the free version) lets you fill out forms and add comments but does not let you change the text itself. Adobe Acrobat Pro costs money and does let you edit text, but most people do not need it. For free editing, Google Drive lets you upload a PDF and convert it to a Google Doc, which you can then edit and download as a new PDF. This works well for simple documents but does not always preserve complex layouts.

Opening a PDF from an email or website

When you click a PDF link in an email or on a website, your browser usually opens it in a built-in viewer instead of downloading it first. Chrome, Edge, and Firefox all have PDF readers built in. You can view and search the PDF right there, and if you want to save it, look for a download button (usually a down arrow) in the toolbar.

If the PDF does not open in your browser and instead tries to download, check your browser settings. In Chrome, go to Settings, then Privacy and Security, then Site Settings, then PDF Documents, and make sure "Download PDFs instead of opening them in Chrome" is turned off. In Edge, go to Settings, then Privacy, Search, and Services, scroll down to Permissions, click PDF Documents, and turn off "Always download PDF files."

Frequently Asked Questions

Why won't my PDF open?

The file might be corrupted, or your default PDF reader might not be installed properly. Try right-clicking the file and opening it with a different program — if it opens in Chrome or Edge, the file is fine and you just need to reinstall or reset your default reader. If it does not open in any program, the file itself may be damaged and you may need to download it again.

Can I open a PDF without installing Adobe Reader?

Yes. Windows has Edge, Mac has Preview, and all phones have built-in readers. Chrome, Firefox, and Safari also have PDF readers built in. Adobe Reader is optional and only needed if you want features the free versions do not have, like advanced form filling or editing.

How do I open a password-protected PDF?

Type the password when the PDF reader asks for it. Most readers will prompt you the first time you open the file. If you forget the password, there is no way to open it — the password is set by whoever created the PDF, and only they can remove it or give you the correct one.

Can I open a PDF on my smartwatch?

Most smartwatches do not have PDF readers built in. Your best option is to read the PDF on your phone or computer instead. Some smartwatches can display text from notifications or messages, but they are not designed for reading full documents.