Reduce sys file size

Download and install the latest version of Filestar.
Right click on one or more Sys file(s) on your desktop and select Convert with Filestar.
Type reduce file size in the search box.
Press Run.

What is .sys?

Name: Windows System File
Extension: .sys
Format: Binary
Category: Developer
Developer: Microsoft
Description: The .sys file type is a Windows system file that contains system drivers, such as those for the Windows kernel, drivers for hardware devices, and system services. System drivers are essential components of the Windows operating system and are used to control various hardware components and operations.
MIME Type: application/x-msdownload

Last updated October 10, 2026