84,488,480 programs installed

Should I remove Sumatra?

What percent of users and experts removed it?
8% remove it92% keep it
Overall Sentiment
Very good
What do people think about it?
Be the first to rate (click star to rate)
How common is it?
Reach <0.001%


2.4 100.00%

Other programs by Krzysztof Kowalczyk



Sumatra is a program developed by Krzysztof Kowalczyk. A scheduled task is added to Windows Task Scheduler in order to launch the program at various scheduled times (the schedule varies depending on the version). The main program executable is sumatrapdf.exe. The software installer includes 6 files and is usually about 9.64 MB (10,110,168 bytes). A majority of the PCs this is running on, most OS versions are Windows 7 (SP1). The distribution of this has mostly been seen in the United States.

Program detailsProgram details

URL: blog.kowalczyk.info/software/sumatrapdf
Installation folder: C:\Program Files\SumatraPDF
Uninstaller: "C:\Program Files\SumatraPDF\uninstall.exe"
Estimated size: 9.64 MB

Program filesFiles installed by Sumatra

Program executable:sumatrapdf.exe
Path:C:\Program Files\sumatrapdf\sumatrapdf.exe
Additional files:
  • uninstall.exe - SumatraPDF Installer
  • PdfFilter.dll (by Simon Bünzli) - SumatraPDF IFilter Persistent Handler (SumatraPDF IFilter Search Helper)
  • PdfPreview.dll (by Simon Bünzli) - SumatraPDF Preview Persistent Handler (SumatraPDF Preview Shell Extension)
  • npPdfViewer.dll - SumatraPDF Browser Plugin
  • libmupdf.dll (by Artifex Software) - SumatraPDF (MuPDF Rendering Library)

Program behaviorsBehaviors exhibited

Google Chrome Plugin
  • npPdfViewer.dll is loaded in the Google Chrome web browser as 'npPdfViewer.dll'.
Mozilla Plugin
  • npPdfViewer.dll is loaded into Mozilla Firefox under the product name 'SumatraPDF Browser Plugin' with a plugin key of '@mozilla.zeniko.ch/SumatraPDF_Browser_Plugin' for all users of the PC.
Scheduled Task
  • SumatraPDF.exe is scheduled as a task with the class '{5CB70842-B0A1-4792-AA66-51ED5DEFB6D1}' (runs on registration).

How do I remove Sumatra?

You can uninstall Sumatra from your computer by using the Add/Remove Program feature in the Window's Control Panel.
  1. On the Start menu (for Windows 8, right-click the screen's bottom-left corner), click Control Panel, and then, under Programs, do one of the following:
    • Windows Vista/7/8/10: Click Uninstall a Program.
    • Windows XP: Click Add or Remove Programs.
  2. When you find the program Sumatra, click it, and then do one of the following:
    • Windows Vista/7/8/10: Click Uninstall.
    • Windows XP: Click the Remove or Change/Remove tab (to the right of the program).
  3. Follow the prompts. A progress bar shows you how long it will take to remove Sumatra.

How do I reset my web browser?

If your web browser homepage and search settings have been modfied by Sumatra you can restore them to their previous default settings.
Microsoft Internet Explorer
Mozilla Firefox
Google Chrome

Plugs into Mozilla Firefox
Uninstall it 8%
Keep it 92%
Windows 7 (SP1)

Distribution by countryGeography

100.00% of installs come from the United States
Which countries install it?
  United States 100.00%


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