How to compress (zip up) a file to reduce its file size

  • Article ID: 117369
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  • Updated: 19 Mar 2013

This article explains how to compress (or 'zip up') a file using either the built in Windows compression tool or 7-zip (a free and open source Windows utility for manipulating archives).

Though it is possible to compress a file using the built in Windows tool a much smaller file size can be produced if you use the 7-zip utility.  When compressing large files we recommend you use 7-zip so it is easier to transfer and/or uploaded the file.

Note: In the screenshots below we will show a file called 'MEMORY.DMP' being compressed.

Choose a method for compressing a file:


Known to apply to the following Sophos product(s) and version(s)

Not product specific

Operating systems
Windows XP and above

Compressing a file with the built in Windows tool

  1. In Windows Explorer browse to the file you want to compress.
  2. Right-click on the file and select 'Send to' | Compressed (zipped) folder'...


  3. Allow the compression process to complete...


The file is now compressed.  It has the same file name as the original but with a '.zip' file extension.


Compressing a file with 7-zip

7-zip is a third-party application and not part of the Windows operating system. If not installed you can download/install the latest version from 7-zip.org.

  1. In Windows Explorer browse to the file you want to compress.
  2. Right-click on the file and select '7-Zip' | 'Add to archive...'


  3. In the 'Add to Archive' dialog, under 'Compression Level' change the setting to 'Ultra'.


    This will configure 7-zip to create the smallest output file possible, however it will increase time required for compression.

  4. Allow the compression process to complete...


The file is now compressed.  It has the same file name as the original but with a '.7z' file extension.


 
If you need more information or guidance, then please contact technical support.

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