DoubleKiller searches for duplicate files by comparing any combination of name, size, modification date and content. You can exclude files or limit the scan to files matching masks like *.mp*g, files in a particular file size range or files with certain attributes, like hidden or system files. When the scan is finished a list containing all duplicates found is displayed and you can manually or automatically select the files to be removed. The result list can be sorted and exported to a textfile readable by both humans and spreadsheet applications. DoubleKiller is a stand-alone executable that does not need to be installed, just extracted and run, and does not alter the system in any way without the user's prior permission.