Select the new default PDF viewer that you want to use a default PDF viewer in the pop up of list of programs that are available on the system.

Click or tap on the current default program associated with PDFs to the right.The file extensions are listed alphabetically. pdf file extension under the “File type and protocol associations” section.

Select the app that you want to use as default PDF viewer, such as Adobe Acrobat Reader, and hit Manage.

In “Default apps”, tap or click on Set defaults by app.

If you know that a PDF viewer has built-in support to publish the file format and file type associations that it supports, you can also change the default PDF viewer by changing the defaults by app. How to Change Default PDF Viewer in Windows 10 This tutorial shows you how to change the default PDF opener in Windows 10. It’s easy to change the default PDF viewer in Windows 10 so that whenever you double click or tap on a PDF document, it will automatically open on your preferred PDF viewer or editor. For example, the ability to add text, sign signature, add annotations, merge PDFs, resize, rotate and even edit the PDF itself. You may prefer to use a standalone PDF app, such as Adobe Acrobat Pro, Adobe Acrobat Reader, Foxit Reader or PhantomPDF, Nitro Pro and many others, which offers a lot more features and functionality. In fact, all web browsers support opening and viewing of PDF files with built-in viewer, so you may have accidentally set them as default PDF viewer when installing additional web browsers such as Chrome, Firefox, Opera and etc. For example, Windows 10 opens PDF documents in Microsoft Edge, a web browser, by default as it’s the built-in default PDF viewer in Windows 10. However, the default Acrobat PDF viewer comes with the OS may not be the one you prefer to use. As such, most operating systems including Windows 10 comes with built-in support to open, view and print PDF file with a PDF viewer. Adobe Acrobat PDF file format is one of the popular file format for document sharing especially among education institutions and commercial corporations.

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