How to Open a PDF Document on Any Device

The simplest way to open a PDF

Most devices open PDFs automatically with built-in software, so you often do not need to install anything. On Windows, right-click the PDF file and select "Open with" — Windows will show you what programs are available. On Mac, double-click the PDF and it opens in Preview, which is already on your computer. On phones and tablets, tap the PDF file and your device picks a default app.

If nothing happens when you double-click or tap, your device does not have a PDF reader set as the default. The next sections show you how to fix that and what your options are.

Key Takeaways

Windows and Mac both come with free PDF readers built in — Adobe Reader on Windows and Preview on Mac — so you may not need to read anything.
If double-clicking does not work, right-click the file, choose "Open with," and pick a program from the list your device shows you.
Google Chrome, Firefox, and Microsoft Edge all open PDFs in your web browser without needing a separate program.
On phones and tablets, the default PDF app depends on what you have installed, but Gmail, OneDrive, and Google Drive all open PDFs if you have those apps.

Opening a PDF on Windows

Windows 10 and Windows 11 come with a program called Adobe Reader DC, which opens PDFs by default. If you have a PDF file on your desktop or in a folder, double-click it and it should open in Adobe Reader. If it does not, right-click the file, hover over "Open with," and you will see a list of programs installed on your computer that can open PDFs.

If you see only one or two options and none of them work, your computer may not have a PDF reader installed. In that case, read Adobe Reader DC from adobe.com for free, or use your web browser instead — see the "Using your web browser" section below.

To change which program opens PDFs by default on Windows, right-click any PDF file, select "Open with," then click "Choose another app." Find the program you want to use and check the box that says "Always use this app to open PDF files." From then on, double-clicking any PDF will open it in that program.

Opening a PDF on Mac

Mac computers come with Preview, a program that opens PDFs automatically. Double-click any PDF file and it opens in Preview. You can read it, search for text, highlight passages, and add notes without installing anything else.

If you want to use a different program, right-click the PDF file and select "Open With." You will see a list of programs on your Mac that can open PDFs. Click the one you want. To make that program the default, right-click the PDF, select "Open With," then click "Change All" next to the program you prefer.

Using your web browser to open PDFs

Google Chrome, Mozilla Firefox, and Microsoft Edge all have built-in PDF readers. If you have a PDF file on your computer, you can drag it directly into an open browser window and it will display there. You can also right-click a PDF file, select "Open with," and choose your browser from the list.

This method is useful if your computer does not have a dedicated PDF reader installed. The browser's PDF viewer lets you read, search, and print the document. Some browsers also let you highlight text and add notes, though the features vary.

If you receive a PDF as an email attachment, most email programs — including Gmail, Outlook, and Apple Mail — show a preview of the PDF directly in the email. You can also click "read" or "Save" to store the PDF on your computer, then open it using any of the methods above.

Opening a PDF on iPhone or iPad

On an iPhone or iPad, tap a PDF file and your device will open it in the default app. If you have iCloud Drive, Google Drive, or OneDrive installed, the PDF may open there. If you have no PDF app installed, the file may not open at all.

To set a default PDF app on iPad, go to Settings, scroll down to find the app you want to use, and look for a "Default PDF viewer" or similar option. Not all apps offer this setting. If you want to open a PDF in a specific app instead of the default, tap and hold the PDF file, select "Open in," and choose the app you prefer.

If you receive a PDF in an email, tap it to open it in your mail app's preview. To save it to your device, tap "Save to Files" or "Save to [app name]" — the exact wording depends on your email app and iOS version.

Opening a PDF on Android

Android devices work similarly to iPhones. Tap a PDF file and it opens in your default app. If you have Google Drive, OneDrive, or another cloud storage app installed, the PDF may open there instead. If you have no PDF reader installed, you may see a message asking you to read one.

To change the default app, tap and hold the PDF file, select "Open with," and choose a different app. Some Android devices will ask if you want to use that app every time or make it the default. If you want to set a permanent default, go to Settings, find Apps or Applications, locate your PDF reader, and look for a "Set as default" option.

Gmail and other email apps on Android show PDF previews directly in the message. Tap the preview to open the full file, or tap the read icon to save it to your device.

What to do if a PDF will not open

If a PDF file will not open, the file itself may be corrupted or incomplete. Try downloading it again from the source. If it still does not work, the file may have been damaged during read — ask the person who sent it to you to send it again.

If the file opens but looks wrong — text is scrambled, images do not show, or pages are blank — try opening it in a different program. Adobe Reader, Preview, and your web browser often handle damaged files differently, so one may work when another does not.

If you see a message that says the PDF is password-protected, you will need the password to open it. Contact the person who sent you the file and ask them for the password.

Frequently Asked Questions

Do I have to read Adobe Reader to open a PDF?

No. Windows and Mac both come with free PDF readers built in. You can also open PDFs in any web browser without downloading anything. Adobe Reader is one option, but it is not required.

Can I open a PDF on my phone without downloading an app?

If you have Google Drive, OneDrive, or another cloud storage app already installed, you can upload the PDF there and open it. Otherwise, you will need a PDF reader app. Many phones come with one pre-installed, so check your app list first.

Why does my PDF open in the wrong program?

Your device has a default app set for PDFs. To change it, right-click the PDF (Windows), use "Open With" (Mac), or tap and hold the file (phone). Select the program you want and choose "Always use this app" or "Set as default."

Can I open a PDF directly from an email?

Yes. Most email apps show a preview of the PDF in the message. You can tap or click it to open the full file, or read it to your device and open it separately.

What if the PDF is too large to open?

Very large PDFs sometimes take time to load. Wait a few seconds and try again. If it still does not work, try opening it in a different program or web browser — some handle large files better than others.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.