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Set Up SumatraPDF as a Lightweight PDF Reader on Windows 11

Install SumatraPDF, associate PDF files with it, and customize document viewing.

by@guidox updated:10/29/26 time:10 min level:Beginner works on:Windows 11 25H2 x64, SumatraPDF Windows builds tools:SumatraPDF
TL;DR

Install **SumatraPDF**, assign it as your PDF reader, and verify that documents open correctly.

Before you start

Requirements

  • Windows 11 25H2 x64
  • SumatraPDF from https://www.sumatrapdfreader.org/download-free-pdf-viewer
  • Sample PDF document
Step by step

Instructions

01

Download SumatraPDF

Open the official website and choose the Windows installer or portable package.

02

Install or extract

Run the installer or extract the portable package into a permanent folder.

03

Open a PDF

Launch **SumatraPDF** and use **File > Open** to select a sample document.

04

Configure viewing

Open **Settings > Options** and review display, navigation, and application preferences.

05

Set the default application

Open **Settings > Apps > Default apps**, find the PDF file association, and select SumatraPDF.

06

Verify the association

Double-click a PDF in **File Explorer** and confirm it opens in SumatraPDF.

Troubleshooting

Common issues

PDFs still open in another browser.

Check the PDF extension association inside Windows Default apps.

The portable version is not listed.

Use Windows' **Choose an app on your PC** option and select the portable executable.

FAQ

Frequently asked

Can SumatraPDF edit PDF text?

It is primarily a document viewer rather than a full PDF editor.

Does it support portable use?

Yes. A portable Windows package is available.

How to undo this

Restore the previous default PDF application in Windows settings and uninstall or delete **SumatraPDF**.

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