What is flux.exe?

The genuine flux.exe file is a software component of f.lux by Flux Software.
f.lux is a multi-platform application that adjusts display color temperature according to the time of day. Flux.exe runs the f.lux application. This is not an essential Windows process and can be disabled if known to create problems. f.lux automatically adjusts the device's color temperature according to the time of day, according to a user-specified location based on a location name, geographical coordinates, or a ZIP code. The display colour is automatically changed to a warmer tone at sunset and is reverted back to the original at sunrise. The program was designed to reduce the intensity of blue-white light at night, with the intention of improving the effectiveness and quality of sleep. f.lux was created and first released by Michael and Lorna Herf in February, 2009.

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 flux.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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Flux.exe file information

Windows Task Manager with flux
Flux.exe process in Windows Task Manager

The process known as f.lux or f.lux R belongs to software f.lux or Downloader or F.lux by Flux Software.

Description: Flux.exe is not essential for the Windows OS and causes relatively few problems. The flux.exe file is located in a subfolder of the user's profile folder. Known file sizes on Windows 10/8/7/XP are 1,017,224 bytes (68% of all occurrences), 966,656 bytes and 6 more variants. 
There is no file information. It is not a Windows core file. The file has a digital signature. The program is not visible. The process is loaded during the Windows boot process (see Registry key: Run, User Shell Folders, MACHINE\Run, DEFAULT\Run). Flux.exe is able to record keyboard and mouse inputs. Therefore the technical security rating is 65% dangerous; however you should also read the user reviews.

Uninstalling this variant: There is a possibility to uninstall f.lux or Wtyczka e-Deklaracje from your computer using the Control Panel applet Uninstall a Program.

Recommended: Identify flux.exe related errors

If flux.exe is located in a subfolder of "C:\Program Files", the security rating is 65% dangerous. The file size is 1,017,224 bytes (59% of all occurrences), 966,656 bytes and 4 more variants. The file is a file with no information about its developer. The program has no visible window. The file is not a Windows core file. It is certified by a trustworthy company. Flux.exe is able to record keyboard and mouse inputs.

Uninstalling this variant: There is a possibility to uninstall f.lux from your computer using the Control Panel applet Uninstall a Program.

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

Screen adjusting program
not dangerous, if you installed f.lux then this just is the program for it. auto runs.
it just dims the screen so it is not so bright and less strain on the eyes it gives it a soft light feel!
Its just a program that changes the brightness and tint of your screen when time changes where you live to help your eyes.
There's a program called f.lux which controls the color temperature of your moniter, it runs as flux.exe. It isn't malware.
  Mike   (further information)
Reduces color temp of your monitor at night and increases it durring the day.
  Matt Bunt   (further information)
This exe is not related to the f.lux screen utility by Flux Software LLC
  Lorna Herf  
It works, but you have to adjust to your preferences -
  Hans G. Andersen  
It might be possible that flux can install adware and other software without user's permission. After installing flux, I noticed that some software just appear on my PC out of nowhere (Opera, VLC player). One day, I found my pc to be infected with some adware (mystarsearch, cinemaP). I have not install any new thing after flux, so it is likely this is caused by flux itself.
It is malware. The shills that rate this any higher than dangerous must be ignored. A shady "PC Cleaner" process was associated with flux.exe.
It's a screen adjusting program that changes the overall screen color based on the time of day... I forgot I even had it installed. There should be a taskbar icon for it where you can change settings or turn it off.
  Jason Turner   (further information)

Rating chart

Summary: Average user rating of flux.exe: based on 14 votes with 11 user comments. 8 users think flux.exe is essential for Windows or an installed application. One user thinks it's probably harmless. 3 users think it's neither essential nor dangerous. One user suspects danger. One user thinks flux.exe is dangerous and recommends removing it. One user is not sure about it.

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Best practices for resolving flux issues

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

flux.exe [all]