Download CCleaner Free – Complete Installation and Usage Guide

What Is CCleaner?

CCleaner (short for Crap Cleaner) is a system cleaning and optimization tool that is completely free, developed by Piriform (now part of Gen Digital — the parent company of Norton, Avast, and AVG). It is the most popular PC cleaner in the world, with over 2.5 billion downloads as of 2026, used by millions of individual users and businesses globally.

Unlike Windows' built-in cleaning tools (Disk Cleanup, Storage Sense) which only remove basic temporary files, CCleaner performs deeper cleaning — from browser cache, browsing history, temporary files from hundreds of applications, to the Windows Registry and duplicate files. CCleaner also includes optimization tools such as Startup Manager, Uninstall Manager, and Secure File Deletion.

History of CCleaner

CCleaner was first released in 2003 by British developer Guy Levene, originally named Crap Cleaner — later shortened to CCleaner. Over more than 20 years of development, CCleaner has become the standard in system cleaning software.

Key development milestones:

• 2003: Guy Levene releases the first version of Crap Cleaner
• 2008: Piriform founded as a company, CCleaner 2.0 released
• 2012: CCleaner 3.0 with ribbon interface, Windows 8 support
• 2015: CCleaner 5.0 adds Monitoring, Browser Plugins
• 2017: Acquired by Avast, CCleaner 5.33 security incident — 2.27 million users affected
• 2019: Enhanced security measures, CCleaner under new Avast oversight
• 2020: CCleaner joins Gen Digital (NortonLifeLock + Avast)
• 2022-2026: CCleaner 6.x with modern UI, Health Check, Software Updater, privacy optimization

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Key Features of CCleaner

CCleaner offers a comprehensive set of features for cleaning and optimizing your system:

System Cleanup

CCleaner scans and removes junk files from multiple sources:

Category	Cleans
Windows	Recycle Bin, Temporary Files, Clipboard, Memory Dumps, Windows Logs, DNS Cache, Font Cache
Browsers	Cache, Cookies, Browsing History, Download History, Session, Autofill, Saved Passwords — supports Chrome, Firefox, Edge, Opera, Brave, Vivaldi
Applications	Adobe Reader, Microsoft Office, Media Players (VLC, iTunes, Windows Media Player), 7-Zip, WinRAR, and over 200 other applications
System	Prefetch, Thumbnail Cache, Recent Documents, Run History, Search History, Taskbar Jump Lists

Registry Cleaner

CCleaner scans and fixes errors in the Windows Registry:

• Missing Shared DLLs: DLL files with broken references
• Unused File Extensions: File extensions no longer in use
• ActiveX & Class Issues: Broken ActiveX and COM Class entries
• Application Paths: Invalid application paths
• Help Files: Deleted help file references
• Fonts: Fonts that no longer exist
• Start Menu Shortcuts: Broken Start Menu shortcuts
• Software Uninstall: Missing uninstaller entries

Note: Always back up the registry before cleaning (CCleaner will prompt you). Incorrect registry cleaning can cause system errors.

Startup Manager

CCleaner lets you manage programs that auto-start with Windows:

Type	Description
Windows Programs	Programs starting via Registry (Run, RunOnce)
Scheduled Tasks	Scheduled tasks set to run automatically
Context Menu	Right-click menu entries
Services	Windows background services

Uninstall Manager

CCleaner includes a powerful Uninstall Manager that surpasses Windows' default Add/Remove Programs:

• Batch uninstall applications
• Remove orphaned application entries
• Fix broken uninstallers
• View detailed app information (installation date, size, version)

Drive Wiper (Secure File Deletion)

The Drive Wiper permanently deletes files beyond recovery:

• Simple Overwrite (1 pass): Sufficient for most users
• Advanced (3 passes): DoD 5220.22-M standard
• Complex (7 passes): U.S. military standard
• Very Complex (35 passes): Gutmann standard

Health Check

The Health Check feature (CCleaner 6+) performs comprehensive scanning and optimization in one click:

1. Privacy Clean: Remove cache, history, cookies
2. Performance Optimizer: Clean registry, manage startup
3. Security & Updates: Check for software updates

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How to Download and Install CCleaner

How to Download CCleaner Free

Download CCleaner from the official website using the Download button at the top of this article. CCleaner comes in three editions:

• CCleaner Free: Free, full basic cleaning features
• CCleaner Professional: Paid ($29.99/year) — adds Real-time Monitoring, Automatic Updates, Premium Support
• CCleaner Business: For enterprises ($44.99/year/machine)

Recommendation: The Free version is sufficient for most users' basic cleaning needs.

System Requirements

Operating System	Requirements
Windows	Windows 7 / 8 / 8.1 / 10 / 11 (32-bit or 64-bit), 500MB RAM, 50MB disk space
macOS	macOS 10.15 Catalina or later, 500MB RAM, 50MB disk space

Installing CCleaner on Windows

1. Download the installer: ccsetup632.exe (~25MB)
2. Run the installer: Double-click the downloaded file
3. Choose language: CCleaner supports multiple languages
4. Select installation options:
   • Add to Start Menu
   • Add to context menu (Run CCleaner)
   • Create Desktop shortcut
   • Scan when computer is idle (recommend disabling if not needed)
5. Install: Click Install then Finish
6. Initial configuration: Uncheck Smart Cleaning (real-time monitoring) if you want the pure Free version experience

Security warning: During installation, CCleaner may offer to install third-party software (such as Avast Free Antivirus). Uncheck these options if not needed. Always choose Custom Install to control what gets installed.

Installing CCleaner on macOS

1. Download the .dmg file from the official website
2. Drag CCleaner to Applications
3. Launch CCleaner from Launchpad

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Basic Usage Guide

One-Click Clean

This is the fastest way to clean your computer:

1. Open CCleaner
2. Click Custom Clean (or Health Check on version 6+)
3. Review the list of items to be cleaned
4. Click Analyze to see how much space can be freed
5. Click Run Cleaner to start cleaning

Registry Clean

1. Switch to the Registry tab
2. Check all items (default)
3. Click Scan for Issues
4. After scanning, click Save backup and choose a location
5. Click Fix selected issues

Managing Startup Programs

1. Go to Tools > Startup
2. Review programs that start with Windows
3. Disable: Turn off unnecessary programs
4. Delete: Remove programs from the startup list

Uninstalling Applications

1. Go to Tools > Uninstall
2. Select the application to remove
3. Click Run Uninstaller to uninstall
4. Use Delete Entry to remove leftover entries

Secure File Deletion

1. Go to Tools > Drive Wiper
2. Choose Free Space Only (clean empty space) or Entire Drive (whole drive)
3. Select the overwrite method (1 pass for basic, 3 or 7 passes for absolute security)
4. Click Wipe

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CCleaner vs Other Cleaning Tools

Criteria	CCleaner Free	BleachBit	Windows Disk Cleanup	Wise Disk Cleaner
Price	Free	Free (GPL)	Free (built-in)	Free (ad-supported)
Registry Cleaner	✔	✘	✘	✔
Startup Manager	✔	✘	✘	✘
Uninstall Manager	✔	✘	✘	✔
Drive Wiper	✔	✔	✘	✔
macOS Support	✔	✔	✘	✘
Platforms	Windows, macOS	Windows, Linux	Windows	Windows

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Practical Applications of CCleaner

Regular PC Maintenance for Office Work

Office workers should run CCleaner once a week to clear browser cache, Windows temporary files, and Microsoft Office junk. This prevents the hard drive from filling up and keeps the system running smoothly.

Optimizing Before Heavy Workloads

Before video editing, graphic design, or 3D rendering, check your hardware specs with CPU-Z first, then run CCleaner to free up disk space and RAM. Combine with 7-Zip for file compression and HandBrake for video compression to maximize storage efficiency.

Privacy Protection on Shared Computers

If you use a shared computer at work or home, CCleaner helps clear browsing history, cookies, and temporary files — protecting your personal information from being viewed by others.

Preparing for Game Installation

Before installing a large game, use TreeSize Free to analyze disk space and identify removable files and folders, then run CCleaner to free up additional space and optimize the registry, ensuring a smoother installation process.

Preparing a Computer for Sale or Donation

Use CCleaner's Drive Wiper with the 7 passes standard to permanently erase all personal data before selling or donating your computer — ensuring no one can recover your old files.

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Common Errors and Troubleshooting

CCleaner Deleted Important Files

• Always back up the registry when prompted
• Review the cleaning list carefully before clicking Run Cleaner
• Restore deleted files from Recycle Bin
• Go to Tools > Registry Backup to restore the registry if needed

Computer Slower After CCleaner

• Check Startup Manager: you may have disabled a necessary program
• Cleaning too many registry items at once can cause issues — only clean safe items (ActiveX & Class Issues, Missing Shared DLLs)
• Restart your computer after registry cleaning

CCleaner Cannot Clean Browser Cache

• Ensure the browser is completely closed before cleaning
• Check that CCleaner is updated to the latest version
• Go to Options > Cookies to check preserved cookies

"Cannot delete file" Error

• The file is in use by another application
• Run CCleaner with Run as Administrator
• Close all applications before cleaning

Free Version Feature Limitations

The Free version does not include Real-time Monitoring, Automatic Updates, or Software Updater. Core cleaning features (Custom Clean, Registry, Startup Manager, Uninstall, Drive Wiper) are completely free.

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Frequently Asked Questions

Is CCleaner really free?

Yes. CCleaner Free is completely free with all essential cleaning and optimization features. Professional and Business versions are paid and add advanced features like real-time monitoring, automatic updates, and priority support.

Is CCleaner safe?

CCleaner experienced a security incident in 2017 (a supply chain attack affecting 2.27 million users). Since then, Piriform/Gen Digital has significantly strengthened security. However, always download CCleaner from the official ccleaner.com website and keep it updated. If security is a major concern, consider BleachBit (open-source) as an alternative.

Is registry cleaning safe?

Registry cleaning with CCleaner is generally safe for most users if you back up the registry first. CCleaner only scans for orphaned references (missing DLLs, deleted help files, etc.) — it does not remove critical registry keys. However, if your system is running fine, you don't need to clean the registry frequently.

How often should I run CCleaner?

• Basic cleanup (Custom Clean): Once a week
• Registry clean: Once a month or when encountering software errors
• Drive Wiper: Before selling or donating a computer

Does CCleaner support Vietnamese?

Yes. CCleaner supports Vietnamese language interface. Select Vietnamese during installation or go to Options > Settings > Language.

Should I use Smart Cleaning?

Smart Cleaning (limited in Free version) automatically cleans junk when the computer is idle. If you prefer manual control, disable it in Options > Smart Cleaning.

Does CCleaner find duplicate files?

CCleaner Free does not include a duplicate file finder. This feature is available in CCleaner Professional. For free duplicate file detection, use dupeGuru or CloneSpy.

Is there a portable version?

Yes. CCleaner offers a Portable version on the official website that runs directly from a USB drive without installation. The portable version omits Smart Cleaning and some advanced features.

How do I update CCleaner?

In the Free version, go to Options > Check for Updates to check manually. The Professional version updates automatically. You can also download the latest version from the official website and install over the existing version.

What is the difference between CCleaner and CCleaner Browser?

CCleaner Browser is a Chromium-based web browser with built-in privacy and anti-tracking features. It is a separate product, unrelated to the CCleaner cleaning software.

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Conclusion

CCleaner is the world's most popular free system cleaning and optimization tool. With over 20 years of development, more than 2.5 billion downloads, and a comprehensive feature set (junk cleaning, registry cleaner, startup manager, uninstall manager, secure file deletion), CCleaner is an essential tool for keeping your computer clean and running smoothly.

Whether you are an office worker needing regular cleanup, a gamer optimizing performance, or a casual user protecting your privacy, CCleaner delivers exceptional results. Download CCleaner free using the Download button at the top of this article and start optimizing your PC.

Explore other useful free tools: CPU-Z (hardware information), Everything (instant file search), 7-Zip (file compression), HandBrake (video converter), LibreOffice (office suite), VLC Media Player (multimedia player), and Audacity (audio editing).