What is SmartDefrag.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 SmartDefrag.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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SmartDefrag.exe file information

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

The process known as Smart Defrag (version v2, v4, v3, V2) belongs to software Smart Defrag (version 2, 4, 3, 4 Pro) by IObit (

Description: SmartDefrag.exe is not essential for the Windows OS and causes relatively few problems. SmartDefrag.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 4,534,560 bytes (21% of all occurrences), 4,525,344 bytes and 28 more variants. 
The SmartDefrag.exe file is not a Windows system file. It is digitally signed. SmartDefrag.exe is a Verisign signed file. The program has no visible window. SmartDefrag.exe is able to connect to the Internet, monitor applications, manipulate other programs and record keyboard and mouse inputs. Therefore the technical security rating is 30% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you have any problems with SmartDefrag.exe, you may want to do the following:
  1) uninstall Smart Defrag 4 or Smart Defrag 2 from your computer using the Control Panel applet Uninstall a Program
  2) ask for help from Support
  3) look for a new, improved version.

Recommended: Identify SmartDefrag.exe related errors

If SmartDefrag.exe is located in a subfolder of the user's "Documents" folder, the security rating is 66% dangerous. The file size is 4,534,560 bytes. The program has no visible window. SmartDefrag.exe is a Verisign signed file. The SmartDefrag.exe file is digitally signed. The software uses ports to connect to or from a LAN or the Internet. SmartDefrag.exe is not a Windows core file. SmartDefrag.exe is able to connect to the Internet, record keyboard and mouse inputs, monitor applications and manipulate other programs.

Important: Some malware camouflages itself as SmartDefrag.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the SmartDefrag.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

Accelerate the whole system with fast and efficient disk defragment.
  GilberT   (further information)
Smart Defrag Software.
If you leave your computer idle for any length of time, Smartfrag.exe_32 starts using 95-97% of available processing power. It does not stop using it when computer becomes active again. Only solution is to cancel the process in Task Manager. Had same issues on all versions
  Dave R  

Summary: Average user rating of SmartDefrag.exe: based on 4 votes with 3 user comments. 3 users think SmartDefrag.exe is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous.

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Best practices for resolving SmartDefrag issues

A clean and tidy computer is the key requirement for avoiding problems with SmartDefrag. 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 SmartDefrag.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

SmartDefrag.exe [all]