What is emFilter?

EmFilter.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if emFilter.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for emFilter drivers in need of updating

EmFilter.sys file information

The process known as EM27xx (version EM28xx Filter Driver) or USB 28xx WDM Lower filter or WDM NULL filter driver belongs to software USB Device Lower Filter or EM27xx (version EM28xx USB Video Convertor) or Windows® Server (version 2003 DDK driver) by eMPIA Technology ( or Windows® Server ( (version 2003 DDK provider).

Description: EmFilter.sys is not essential for the Windows OS and causes relatively few problems. The file emFilter.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 5,245 bytes (40% of all occurrences), 99,712 bytes, 79,563 bytes or 19,328 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. There is no detailed description of this service. EmFilter.sys is not a Windows core file. emFilter.sys appears to be a compressed file. Therefore the technical security rating is 16% dangerous; however you should also read the user reviews.

Recommended: Identify emFilter.sys related errors

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

Driver for V-Gear web cam
  Claudio   (further information)

One user is not sure about it.

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Best practices for resolving emFilter issues

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

emFilter.sys [all]