Defraggler is a simple tool for defragmentation of system partitions (NTFS and FAT32) developed by the authors of CCleaner. The application is distinguished by the ability to defragment free disk space and selected partitions, directories or files. In addition, Defraggler has added the ability to scan for errors and prioritize defragmentation.

Like other Piriform products (CCleaner, Recuva), the Defraggler takes up little disk space and can be moved anywhere without the need for installation.