How to Change the Default PDF Viewer on Android and Samsung

Enrica Taylor

Home » Mobile App » How to Change the Default PDF Viewer on Android and Samsung

To change the default PDF viewer on Android, first clear the current app’s default settings under Settings > Apps. Then open a PDF again, select your preferred viewer, and tap Always. The exact menu names vary by phone brand, Android version, and file manager.

If you want a viewer that can also annotate, edit, organize, and summarize PDFs, install UPDF for Android before reopening the file so it appears in the Open with list. You can try it free, then follow the steps below to make it your preferred PDF app.

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Part 1. How to Change the Default PDF Viewer on Android

Android often does not provide one universal “Default PDF Viewer” switch. Instead, you clear the file association for the app currently opening PDFs and select a new app the next time you open one.

Step 1: Install the PDF viewer you want to use.

Confirm that your preferred app is installed and supports PDF files. If you only need to open a specific document, you can also follow this guide to open PDF files on Android without changing every default.

Step 2: Open Settings and find the current PDF app.

Go to Settings > Apps or App management. Select the app that opens PDFs automatically, such as Drive, Samsung Notes, My Files, Chrome, or another reader.

Step 3: Clear the existing default.

Tap Open by default or Set as default, then select Clear default preferences or Clear defaults. Google’s current Android guidance uses the same clear-and-reopen process, although labels vary by device.

how to change default pdf viewer android

Step 4: Open a local PDF again.

Open Files or your phone’s file manager and tap a downloaded PDF. Choose the new viewer from the app list. Tap Always to make it the default, or Just once to use it only for that file.

Note: If no app chooser appears, use the file manager’s Open with command or continue to Part 4. Do not clear an app’s storage or data merely to reset a file association.

Part 2. Paths for Samsung, Pixel, Xiaomi, and Other Phones

The setting is similar across Android devices, but manufacturers use different names. Use the closest path shown below.

Device	Typical Path	What to Do Next
Google Pixel / stock Android	Settings > Apps > current PDF app > Open by default	Clear default preferences, reopen a PDF, and choose a new app.
Samsung Galaxy	Settings > Apps > current viewer > Set as default	Clear defaults, or use Open with inside My Files.
Xiaomi / Redmi	Settings > Apps > Manage apps > current PDF app	Clear defaults and reopen a downloaded PDF.
Oppo / OnePlus	Settings > Apps > App management > current viewer	Open its default settings, clear them, and choose again.

A Note for Recent Samsung One UI Versions

On recent Samsung versions, My Files may open a PDF in its built-in viewer instead of displaying the normal Android app chooser. Open the PDF, tap More options, choose Open with, and select another app. Samsung’s current documentation notes that One UI 8.5 opens PDFs in the My Files viewer by default and provides an Open with option for alternatives.

Part 3. How to Change the PDF Viewer for WhatsApp on Android

WhatsApp usually passes a downloaded PDF to an Android-compatible viewer; it is not necessarily the app that owns the PDF default. Therefore, clearing WhatsApp’s defaults alone may not change which app opens the document.

Download the PDF in WhatsApp.
Long-press the document or use Share/Open with.
Select the viewer you want. If Android asks, choose Always.
If the wrong app still opens, clear that viewer’s defaults under Settings > Apps.
Open the downloaded PDF from Files and choose the new app again.

If the document does not open at all, the issue may involve storage, permissions, an incomplete download, or a damaged file. See the separate guide for a PDF not opening in WhatsApp instead of repeatedly changing the default viewer.

Part 4. What If Android Does Not Show “Open with”?

Problem	What It Usually Means	What to Try
Clear defaults is gray	The selected app may not own the PDF association.	Open the PDF from Files and use Open with.
The old app still opens	Your browser or file manager may be using an internal previewer.	Download the PDF locally and use the previewer’s Open with menu.
Google Drive keeps opening PDFs	Drive may still hold the file association.	Clear Drive’s Open by default preferences.
The new viewer is missing	It may not be installed, enabled, or registered for PDFs.	Update or reinstall it, then open a local PDF again.
No approach works	Several app defaults may be conflicting.	Use Reset app preferences only as a last resort; it resets other defaults too.

Before resetting all app preferences, restart the phone and test a PDF stored locally. PDFs opened inside email, cloud-storage, browser, or messaging previews may behave differently from files opened in the system file manager.

Part 5. Use UPDF as Your Android PDF Viewer

Installing UPDF does not automatically change Android’s file associations. After clearing the old default, open a PDF, select UPDF, and tap Always. It is a practical choice when you need more than basic previewing: you can search and navigate pages, switch viewing modes, highlight or draw on PDFs, edit text and images, organize local documents, and use AI to summarize, translate, or ask questions about a PDF.

For a broader comparison of viewing options, see these PDF readers for Android. If UPDF fits your workflow, download it free and select it the next time Android displays the Open with list.

superior pdf viewing experience updf android

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Part 6. FAQs About Changing the Default PDF Viewer

1. How do I stop Google Drive from opening PDFs by default?

Go to Settings > Apps > Drive > Open by default, then tap Clear default preferences or Clear defaults if that option is available. Open a local PDF again, choose the viewer you want, and tap Always.

2. How do I change the PDF viewer used by WhatsApp?

Download the PDF in WhatsApp, then use Open with or Share to select another PDF app. If the wrong viewer still opens automatically, clear that viewer’s default settings and reopen the downloaded file from Files.

3. Why does Android not show the “Always” option?

Some file managers and built-in previewers open PDFs inside their own interface instead of showing Android’s app chooser. Try the Open with command in Files, or clear the current viewer’s defaults before reopening the PDF.

4. How do I change the default PDF viewer on Samsung?

Open Settings > Apps, select the app currently handling PDFs, and open Set as default or Open by default. Clear its defaults, then open a PDF and select a new app. On recent One UI versions, you may also need to use Open with from the My Files PDF viewer.

5. Can I open a PDF with another app without changing the default?

Yes. Long-press the PDF in your file manager and choose Open with, or use the menu inside the current previewer. Select Just once when Android asks, so the default association remains unchanged.

Conclusion

To change the default PDF viewer on Android, clear the current viewer’s default association and reopen a local PDF. Choose the new app and tap Always. If that option does not appear, use Open with in your file manager and check whether a Samsung, browser, cloud, or messaging previewer is handling the file internally.

Enrica Taylor

Chief Editor

Enrica Taylor is a technology expert with a degree in Software Development and experience writing technical tips and solutions about PDF software. He mainly focuses on tips and solutions for PDF editing, converting, protecting, compressing, etc. He is fond of visiting different technology conventions and events.s