View the questions users most frequently ask about CCleaner. We recommend you read this before looking in other sections.

A full set of detailed documentation is available at ccleaner.com/docs. You'll find how-to's, tips and tricks, and technical information for power users.

Join our community forums at forum.ccleaner.com to chat with fellow users and get answers to your questions.

If you have lost your CCleaner Professional license key or download link, use our license lookup tool to retrieve them.