What is LogonUI.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 LogonUI.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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LogonUI.exe file information

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

The process known as Windows Logon UI or Windows Logon User Interface Host belongs to software Microsoft Windows Operating System by Microsoft (

Description: LogonUI.exe is an important part of Windows, but often causes problems. LogonUI.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 8/7/XP are 514,560 bytes (16% of all occurrences), 504,832 bytes and 14 more variants. 
The program is not visible. It is a Microsoft signed file. LogonUI.exe is able to monitor applications and manipulate other programs. Therefore the technical security rating is 36% dangerous, however you should also read the user reviews.

Recommended: Identify LogonUI.exe related errors

Important: Some malware disguises itself as LogonUI.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the LogonUI.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

this file is not dangerous at all it is related with the logon it's just nothing to worry at all
LogonUI.exe iihad 2 of them 1 C: after using hiremsboot cd program
LOGONUI is a program to open up your user interface. As well there is a loggoffui as well just to determine that you log on or log out. as well as a shutdownui i perhaps to think. If the file description is microsoft etc. in your System32 it's safe. If its on anywere else. Your kid of screwed!
LogonUI.exe is safe as long as it's in the system32 dir.
  Matt_Coastland   (further information)
It is a system file
This Is Windows Graphical Interface When A User Logs off, shuts down or switches user. If Not In The System32 Directory (the Place Its In) It May Be A Virus, If So Run Startup Repair And It Should Fix It On Windows 7 And Vista.
  Tom Zsinko , At TwoDudesOneMine  
it is a logo for screen or you can say a welcome screen
its safe as long as its in the system32 dir
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of LogonUI.exe: based on 77 votes with 9 reviews. 39 users think LogonUI.exe is essential for Windows or an installed application. 3 users think it's probably harmless. 18 users think it's neither essential nor dangerous. 9 users suspect danger. 8 users think LogonUI.exe is dangerous and recommend removing it. 11 users don't grade LogonUI.exe ("not sure about it").

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Best practices for resolving LogonUI issues

A clean and tidy computer is the key requirement for avoiding problems with LogonUI. 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 doing a repair of your installation, or in the case of Windows 8, 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 LogonUI.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

LogonUI.exe [all]