System Cleaner Download Guide

A reputable cleaner mainly does a few honest things: deletes temporary and cache files, clears browser history and cookies, removes leftover files from uninstalled programs, and helps you manage startup items. These are real space-savers and can reduce clutter, especially on smaller SSDs.

What a cleaner cannot do is magically double your speed or fix deep performance problems. If your PC is slow, the cause is more often too little RAM, a failing drive, malware, or too many background apps than a cluttered cache.

Before installing anything, check the tools your operating system already includes. They handle the most common cleanup jobs safely and for free, and a third-party cleaner mainly adds convenience and a few extra categories.

• Windows 11: go to Start, Settings, System, Storage, then Cleanup recommendations. Windows groups what it can remove into temporary files, large or unused files, files synced to the cloud and unused apps, and you pick what to delete.
• Storage Sense: in the same Storage settings, Storage Sense can remove temporary files and Recycle Bin contents automatically on a schedule.
• Windows 10: Settings, System, Storage offers Storage Sense, and Microsoft still points to Disk Cleanup (search for it from the taskbar) on systems without it.
• macOS: the built-in storage management in System Settings shows large files and offers recommendations.

One caution from Microsoft's own guide: if you upgraded Windows in the last 10 days, the cleanup list can include the previous version of Windows. Deleting it removes the Windows.old folder and you can no longer roll back, so leave it until you are sure the upgrade is working. Our guide to freeing up disk space covers more built-in options.

BleachBit is a free, open-source cleaner that removes caches, temporary files and browser data and can shred files. Its download page lists version 6.0.6 as the current stable release, with an installer for Windows 10 and 11 and .deb and .rpm packages for popular Linux distributions. macOS support is described as experimental with limited features, so Mac users are usually better served by the built-in storage tools. BleachBit shows each cleaner as a checkbox with a description, and you can preview what will be removed before you delete anything, which is exactly how a cleaner should behave.

If your computer is slow even with plenty of free space, junk files are probably not the cause. Check these instead:

• Startup apps: disable programs you do not need at startup in Task Manager.
• Unused programs: uninstall them properly; our guide to uninstalling software completely shows how.
• Malware: run a full scan; see our malware removal tool guide.
• Drivers and updates: install Windows updates and current drivers from official sources.
• Hardware: very little RAM or an old hard drive will limit any PC; moving to an SSD is often the single biggest upgrade.

Registry cleaning is not on this list for a reason; our registry cleaner guide explains why it rarely helps.

Registry cleaning is the most overhyped feature in this category. On modern Windows, cleaning the registry rarely produces any noticeable speed improvement, and aggressive cleaning can occasionally cause problems. If a tool offers registry cleaning, use it conservatively (or not at all), and always let it create a backup first.

Be deeply skeptical of pop-ups claiming your PC has 'hundreds of errors' or is 'severely infected.' Those are marketing tricks. Stick to well-known names, download only from the official site, and decline bundled toolbars or antivirus trials during install. A trustworthy cleaner never pressures you with countdown timers or scary red warnings to buy now.

Before a big cleanup, it's wise to know what you're deleting. Most cleaners let you preview the files and uncheck categories you want to keep. Don't blanket-clear saved passwords or autofill data unless you mean to. And if you use a cleaner with system-tweaking features, make changes one at a time so you can undo anything that causes trouble.