What is Defraggler.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the Defraggler.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Defraggler.exe file information

Windows Task Manager with Defraggler
Defraggler.exe process in Windows Task Manager

The process known as Defraggler belongs to software Defraggler by Piriform (

Description: Defraggler.exe is not essential for Windows and will often cause problems. The Defraggler.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 2,365,248 bytes (28% of all occurrences), 2,266,424 bytes and 4 more variants. 
Defraggler.exe is not a Windows system file. Defraggler.exe is a Verisign signed file. The file has a digital signature. Defraggler.exe is able to record keyboard and mouse inputs and monitor applications. Therefore the technical security rating is 9% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you run into problems with Defraggler.exe, you can uninstall the software Defraggler using the Uninstall a Program function of Windows Control Panel (Windows: Start, Settings, Control Panel, Uninstall a Program).

Recommended: Identify Defraggler.exe related errors

Important: Some malware camouflages itself as Defraggler.exe. Therefore, you should check the Defraggler.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

i have no idea how it got on my computer and lags it to hell when i'm trying to play games. i cant get rid of it, i cant uninstall or delete it, i cant even end the process in task manager. it just starts up again. i have a quad-core i7 3.6 ghz processer and it uses 25% of it, which is WAY to much. don't download this junk, it will pretty much destroy your computer and you cant get rid of it. windows comes with a defragmenter anyways that works just fine.

Summary: Average user rating of Defraggler.exe: based on 1 vote with 1 user comment. One user thinks Defraggler.exe is dangerous and recommends removing it.

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Best practices for resolving Defraggler issues

A clean and tidy computer is the key requirement for avoiding problems with Defraggler. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the Defraggler.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

Defraggler.exe [all]