What is oodag.exe?

The genuine oodag.exe file is a software component of O&O Defrag Professional Edition by O&O Software.
A third party defragmentation software, this application is run on demand by the user. O&O Defrag analyzes fragmented hard drives and reallocates space in a fast and efficient defragmentation process. O&O Defrag is a professional and more effienct alternative to the standard Windows Disk Defragmenter. A German company founded in 1997, O&O Software specializes in disk management utilities.

OODAg stands for O&O Defrag Agent

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 oodag.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.

Click to Run a Free Scan for oodag.exe related errors

Oodag.exe file information

Windows Task Manager with oodag
Oodag.exe process in Windows Task Manager

The process known as O&O Defrag Agent (Win32) or O&O Defrag Agent (version (x64)) belongs to software O&O Defrag Professional Edition or O&O Defrag Professional or O&O Defrag or O&O Defrag Server or O&O Defrag Workstation by O&O Software GmbH (

Description: Oodag.exe is not essential for the Windows OS and causes relatively few problems. The oodag.exe file is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 1,050,120 bytes (28% of all occurrences), 225,280 bytes and 13 more variants. 
Oodag.exe is not a Windows core file. The program is not visible. The program listens for or sends data on open ports to a LAN or the Internet. The application can be removed using the Control Panel's Add\Remove programs applet. It is a Verisign signed file. Oodag.exe is digitally signed. Oodag.exe is able to connect to the Internet. Therefore the technical security rating is 39% dangerous, however you should also read the user reviews.

Uninstalling this variant: The software vendor offers the option to visit the vendor’s support site, make sure that you have installed the latest version or completely remove O&O Defrag Professional Edition (Control Panel ⇒ Uninstall a Program).

Recommended: Identify oodag.exe related errors

If oodag.exe is located in a subfolder of "C:\Program Files", the security rating is 20% dangerous. The file size is 1,488,128 bytes (22% of all occurrences), 2,505,072 bytes and 18 more variants. The program is not visible. The process can be removed using the Control Panel's Add\Remove programs applet. Oodag.exe is a Verisign signed file. The file has a digital signature. Oodag.exe is not a Windows system file. The process uses ports to connect to or from a LAN or the Internet. Oodag.exe is able to manipulate other programs and connect to the Internet.

Important: Some malware camouflages itself as oodag.exe, for example Win32:Trojan-gen (detected by Avast), and Trojan Horse (detected by Symantec). Therefore, you should check the oodag.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

Very good defrag tool
the best defrag Prog ever for single or network PC's
O&O Defrag very good tool
very powerful background-defrag engine
  bond   (further information)
good defrag tool
0&0 Defrag Tool
O&O Defrad
  Sir Michi  
super defragmentierungs Tool
Maintain your Hard Disk Defragmentation Optimal and use resources of your CPU when you dont use your computer
it just works
  Viki   (further information)
the best defrag! from ontrack !
Defrag Tool with comfortable functions. But why try it to match internet as a server?
O&O Defrag good tool
good defragger
Exellent defrag tool, very good value for money
o and o defrag
This is a service of O&O Defrag. To save these 5 MB of memory I suggest to disable the service after you have defraged all your disk. And enable the service manually again on the day when you what to defrag your disks again.
Defragmentation tool: O&O Defrag
good defrag tool and for the networkconnection see the o&o FAQ
    (further information)
First class hard drive defragmenter. Best available.
O&O Defrag Professional - This is a component of O&O Defrag, a program that optimizes the performance of fragmented hard disks installed in windows-based workstations and servers. Through the restoration of lost performance due to fragmentation, files can be read and written into the system at a faster pace.
Defrag Tool from O&O Software. This program will optimize your hard disk securely repacking fragmented files together for more efficiency.
  Felix   (further information)
Good defragmenter
Defrag Tool
hervorragendes Defragmentierungsprogramm
  Weber Peter  
it is for the O&O defrag utility from o & o software
  Jarred   (further information)
Defrag Tool from O&O Software. This program will optimize your hard disk securely repacking fragmented files together for more efficiency.
  Felix   (further information)
defrag tool included with windows black
Sehr utes Defrag tool
It's O&O defrag for sure, but why is it listening on my PC
Part of O&O Defrag application
  hhawley   (further information)
O&O Defrag tool
It makes my computer run very fast. [SEE LINK]
  Djin   (further information)
This thing is a HUGE resource hog. It's occupying routinely 55-90% of my CPU, and I'm running a 2.6GHz P4 w/ 3GB RAM in WinXP
Comes as a part of "Hide folders 2009". If so, I wouldn't give it any rights. It's quite suspicious when "O&O Defrag Agent (Win32)" wants to connect in the internet. Besides you might wonder why you can't find "HF 2009" from

Rating chart

Summary: Average user rating of oodag.exe: based on 70 votes with 37 user comments. 55 users think oodag.exe is essential for Windows or an installed application. 4 users think it's probably harmless. 4 users think it's neither essential nor dangerous. 3 users suspect danger. 4 users think oodag.exe is dangerous and recommend removing it. One user is not sure about it.

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Best practices for resolving oodag issues

A clean and tidy computer is the key requirement for avoiding problems with oodag. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the oodag.exe process on your computer, the following programs have proven to be helpful: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

oodag.exe [all]