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 User Interface Host or Windows Logon UI 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 10/8/7/XP are 10,752 bytes (31% of all occurrences), 514,560 bytes and 14 more variants. 
The program is not visible. It is not a Windows core file. Therefore the technical security rating is 39% dangerous, however you should also read the user reviews.

Recommended: Identify logonui.exe related errors

Important: Some malware camouflages itself as logonui.exe, for example Bitcoin Miner (PUA) (detected by Sophos), and Multi:BitCoinMiner-A [Tool] (detected by Avast). 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

It's pretty much what allows you to start up your pc.
LogonUI affecting other tools
just go to c drive open search option then search "logonUI.exe" include hidden folder after search result select all files click delete button
LogonUI.exe may get stuck in the background if you disabled require password upon wake. To get the process to stop, simply lock your screen then unlock it and check your task manager. Voila! Gone.
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)
More comments can be found here:
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Rating chart

Summary: Average user rating of logonui.exe: based on 81 votes with 9 reviews. 40 users think logonui.exe is essential for Windows or an installed application. 3 users think it's probably harmless. 19 users think it's neither essential nor dangerous. 10 users suspect danger. 9 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 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 logonui.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

logonui.exe [all]