CCleaner Pro 5.51 free download Archives

CCleaner Pro 5.51 free download Archives

CCleaner Pro 5.51 free download Archives

CCleaner Pro 5.51 free download Archives


Suite of utilities for cleaning disk and operating system environment
CCleaner 5.6 running on Microsoft Windows 7
Initial release23 September 2003; 16 years ago (2003-09-23)
Stable release(s)[±]
Windows5.70.7909 / 6 August 2020; 36 days ago (2020-08-06)[1]
macOS1.17.603 / 22 August 2019; 12 months ago (2019-08-22)[2]
Android4.22.0 / 14 April 2020; 4 months ago (2020-04-14)[3]
Written inC++
Operating systemWindows 7 and later,[4]
OS X Mountain Lion and later,[4]
Android Lollipop and later
PlatformIA-32 and x64
Available in58 languages
TypeUtility software
LicenseFreemium for home use; commercial for use in organisations and institutions[6]

CCleaner (/ˈsiːkliːnər/, originally Crap Cleaner),[7] developed by Piriform (a company acquired by Avast in 2017), is a utility used to clean potentially unwanted files and invalid Windows Registry entries from a computer. It is one of the longest-established system cleaners, first launched in 2004.[8] It was originally developed for Microsoft Windows only,[9] but in 2012, a macOS version was released.

CCleaner has been reviewed by,[10]TechRadar,[11]PC Magazine,[12] and TechRepublic.[13]


CCleaner can delete potentially unwanted files left by certain programs, including Microsoft Edge, Internet Explorer, Firefox, Google Chrome, Opera, Safari, Windows Media Player, eMule, Google Toolbar, Netscape, Microsoft Office, Nero, Adobe Acrobat, McAfee, Adobe Flash Player, Sun Java, WinRAR, WinAce, WinZip and GIMP[14] along with browsing history, cookies, recycle bin, memory dumps, file fragments, log files, system caches, application data, autocomplete form history, and various other data.[15] The program includes a registry cleaner to locate and correct problems in the Windows registry, such as missing references to shared DLLs, unused registration entries for file extensions, and missing references to application paths.[14] CCleaner 2.27 and later can wipe the MFT free space of a drive, or the entire drive.

CCleaner can uninstall programs or modify the list of programs that execute on startup.[16] Since version 2.19, CCleaner can delete Windows System Restore points.[17][18]


CCleaner was first launched in 2004 for Microsoft Windows.[8] It remained a Windows-only utility until 2012. On 2 June 2011, Piriform announced a public beta test program for CCleaner for Mac.[19] The Mac version graduated to the test stage on 30 January 2012.[20]

A commercial Network Edition was also introduced. Piriform released CCleaner for Android in 2014.[21]

Critical reception[edit]

CNET editors gave the application a rating of 5/5 stars, calling it a 'must-have tool'. It was awarded Editor's Choice Award in April 2009 by CNET.[22] In 2016 Piriform announced 2 billion CCleaner downloads worldwide[23] In January 2014 it had been the most popular software on FileHippo for more than a year, and had a 5-star editor's rating on Softpedia.[24] Softmany select as featured App and give 5 star to it is an outstanding utility to free up hard disk space from unnecessary data[25]. CCleaner has been reviewed by,[10]TechRadar,[26]PC Magazine[27] and TechRepublic.[28]

Data collection[edit]

Upon its release, the Active Monitoring component of CCleaner 5.45 incorporated a data collection module that collected information from computers without the consent of their owners. Piriform claims that it did not collect personally identifiable information. After criticism later versions allowed data collection to be controlled separately by the user, although data collection is still on by default.[29][30][31][32]

Bundled software[edit]

In December 2018, it was reported that users installing CCleaner would also have Avast Antivirus installed without their permission, with TechSpot claiming this arguably made CCleaner no better than the malware it was supposed to defend against. Piriform denied this.[33]

In July 2020, Microsoft Windows Defender began flagging the free version of CCleaner as a "potentially unwanted application", stating that "while the bundled applications themselves are legitimate, bundling of software, especially products from other providers, can result in unexpected software activity that can negatively impact user experiences."[34]

Malware infection[edit]

After Piriform was acquired by Avast, in September 2017, CCleaner 5.33 was compromised by the incorporation into the distributed program of the Floxif trojan horse that could install a backdoor, enabling remote access to 2.27 million[35] infected machines.[36][37] Forty of the infected machines received a second-stage payload that appears to have targeted technology companies Samsung, Sony, Asus, Intel, VMWare, O2, Singtel, Gauselmann, Dyn, Chunghwa and Fujitsu.[38][39] On 13 September, Piriform released CCleaner 5.34 and CCleaner Cloud 1.07.3191, without the malicious code.[40]

On 21 October 2019, Avast disclosed a second security breach during which hackers tried again to insert malware inside CCleaner releases. This attempt was unsuccessful.[41]


  1. ^"CCleaner 5.70.7909". Piriform. 6 August 2020. Retrieved 6 August 2020.
  2. ^"CCleaner for Mac v1.17.603". Piriform. 22 August 2019. Retrieved 22 August 2019.
  3. ^"CCleaner: Cache Cleaner, Phone Booster, Optimizer - Apps on Google Play". Google Play.
  4. ^ ab"What operating systems does CCleaner support?". CCleaner - FAQ. Piriform. Retrieved 5 November 2010.
  5. ^"Changing the language CCleaner uses". CCleaner Documentation. Piriform Ltd. Retrieved 26 October 2018.
  6. ^"Why do I see a message that says 'CCleaner Free is for home use only' or 'CCleaner Free is not free for commercial use?'". Piriform. Retrieved 17 October 2019.
  7. ^"Wayback Machine". 6 June 2004. Archived from the original on 6 June 2004. Retrieved 22 September 2017.
  8. ^ abNakodari. "10 Lessons Software Developers Should Learn From CCleaner's Success". Addictive Tips. Retrieved 25 May 2016.
  9. ^"CCleaner - Optimization and Cleaning - Free Download". Archived from the original on 25 January 2018. Retrieved 26 October 2011.
  10. ^ ab"CCleaner". Retrieved 21 February 2016.
  11. ^"Download of the Day: CCleaner". Archived from the original on 2 March 2016. Retrieved 21 February 2016.
  12. ^"CCleaner (for Mac) Review & Rating". Retrieved 21 February 2016.
  13. ^"Five Tips For Using CCleaner To Degunk Your System". Retrieved 21 February 2016.
  14. ^ ab"CCleaner - Features". Official web site. Piriform. Retrieved 3 June 2010.
  15. ^"Tuning Windows: Less Bull, More Speed". 20 May 2009. Archived from the original on 16 July 2012. Retrieved 2 June 2009.
  16. ^"Screenshot #5: The Startup Tool". Official web site. Piriform. Archived from the original on 29 October 2010. Retrieved 5 November 2010.
  17. ^"CCleaner Version History". Official web site. Piriform. 26 March 2013. Retrieved 26 March 2013.
  18. ^"Screenshot #6: The System Restore tool". Official web site. Piriform. Archived from the original on 2 November 2010. Retrieved 5 November 2010.
  19. ^"CCleaner for Mac [Beta] Released". 2 June 2011.
  20. ^"CCleaner for Mac v1.01". 30 January 2012. Archived from the original on 20 July 2019. Retrieved 20 July 2019.
  21. ^Ferri-Benedetti, Fabrizio (18 April 2014). "CCleaner for Android: too little, too late?". Softonic. Retrieved 21 June 2017.
  22. ^Rosenblatt, Seth (28 October 2010). "CCleaner". CBS Interactive. Retrieved 15 May 2011.
  23. ^Piriform, Software (3 November 2016). "Piriform Announces 2 Billion CCleaner Downloads Worldwide". PR Newswire. Retrieved 2 October 2018.
  24. ^Opris, Elena (7 January 2014). "CCleaner 4 Review". Retrieved 31 January 2014.
  25. ^"CCleaner outstanding utility" free up hard disk space
  26. ^"Download of the Day: CCleaner". Archived from the original on 2 March 2016. Retrieved 21 February 2016.
  27. ^"CCleaner (for Mac ) Review & Rating". Retrieved 21 February 2016.
  28. ^"Five Tips For Using CCleaner To Degunk Your System". Retrieved 21 February 2016.
  29. ^Milena Dimitrova (3 August 2018). "CCleaner v5.45 Introduces Data Collection with No Way to Opt-Out". Sensors Tech Forum. Retrieved 14 October 2018.
  30. ^"CCleaner v5.46.6652". 30 August 2018. Retrieved 14 October 2018.
  31. ^Osborne, Charlie. "CCleaner provokes fury over Active Monitoring, user data collection". ZDNet. Retrieved 28 June 2019.
  32. ^"I'm using CCleaner v5.45. Why is Active Monitoring still on when I have switched it off?". Piriform Support. 8 October 2018. Retrieved 14 October 2018.
  33. ^David Matthews (19 December 2018). "CCleaner may be installing Avast anti-virus without your permission". TechSpot. Retrieved 20 January 2019.
  34. ^"Windows Defender is flagging CCleaner as a Potentially Unwanted Application". TechSpot. Retrieved 5 August 2020.
  35. ^Warren, Tom (18 September 2017). "Hackers hid malware in CCleaner software". The Verge.
  36. ^"CCleanup: A Vast Number of Machines at Risk". Retrieved 21 September 2017.
  37. ^"Hackers compromised free CCleaner software, Avast's Piriform says". 18 September 2017. Retrieved 22 September 2017 – via Reuters.
  38. ^Dan Goodin (25 September 2017). "CCleaner backdoor infecting millions delivered mystery payload to 40 PCs". Ars Technica.
  39. ^"Foreign Economic Espionage in Cyberspace"(PDF). CIA. 24 July 2018.
  40. ^Rubenking, By Jeffrey L. Wilson and Neil J.; September 19, 2017 3:15PM EST; September 19, 2017. "CCleaner Professional Plus". PCMAG.CS1 maint: numeric names: authors list (link)
  41. ^Cimpanu, Catalin. "Avast says hackers breached internal network through compromised VPN profile". ZDNet. Retrieved 21 October 2019.

External links[edit]

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CCleaner Pro 5.51 free download Archives


What is the CCleaner application?

CCleaner is used to clean and tune up the operating system of the PC. With CCleaner, we can carry out a thorough cleaning of the PC in a simple way, which will allow us to gain space on the hard disk and prevent the PC from slowing down. It is one of those free tools for PC that works exceptionally well when it comes to deleting temporary files.

CCleaner is a free, closed-source programme that can be downloaded to various devices and has been developed by the private software company Piriform Ltd, based in London, UK. Its launch date was September 23, 2003. Over the years it has undergone several updates and versions on the three platforms on which it is available: Windows, MacOS and Android.

By downloading CCleaner, the software allows the cleaning up of different files, as well as optimisation of the operating system. In addition, it is capable of uninstalling multiple programmes from the interface and disabling certain applications from being executed at system startup.

The benefits that the device in question derives from downloading CCleaner are improved boot speed, reduced system load and release of wasted disk space. Also, access becomes much faster.

What are the benefits of downloading CCleaner?

To be more specific, the useful tasks that CCleaner performs are as follows:

  • Deleting unnecessary files
  • Deleting temporary files and other data
  • Freeing up hard disk space
  • Disabling programs whose start-up is linked to the system boot
  • Eliminating application waste
  • Deleting browsing histories
  • Cleaning the registry
  • Identifying duplicate files
  • Correcting errors that cause problems

In conclusion, a range of cleaning options allow hard disk space to be freed up, offer stability to the PC, reduce errors that occur during the use of the device and ensure navigation. Meanwhile, repairing the registry allows the elimination of obsolete data, thus repairing this area, which is of vital importance for the operation of computers.

Faster navigation

Downloading CCleaner speeds up searching for information, whether in Firefox, Google Chrome or any other browser. When using the Internet, the computer or device collects a huge number of unnecessary files, such as cookies. Currently, these can be modified according to user preferences in line with privacy policies.

In addition, when running different programs, temporary files and other settings are saved. By downloading CCleaner, all these useless files can be removed, as well as browsing history. As a result, space is freed up on the hard disk, allowing the system to run faster. By focusing only on folders with relatively unimportant files, there is less risk of losing valuable files.

Thanks to the Startup of the application, it is possible to identify and select all those programmes that are not used but are activated when the computer is started. This speeds up the device startup.

Reduced risk of errors

An indication of the need to download CCleaner or another tool of this type is error messages or screen locks. This is due to broken or disused files. This free application includes the Registry Cleaner, which allows these errors to be identified and fixed.

As an additional advantage, the application itself informs you how much you need to back up to avoid losses.

Increased safety of navigation

Despite changes in the law and new regulations on data privacy terms and policies, not all websites offer the same ease of disabling cookies. Downloading CCleaner removes stored data such as passwords, search history, and cached data. This reduces the likelihood of experiencing identity theft or network fraud.

Customisable cleaning

When downloading CCleaner, the user has the option of customising their cleaning options to suit their needs. For those with limited computer knowledge, the application offers some default settings. For the more advanced, the degree of selection can be more comprehensive and even specify the type of cookies.

What other versions are available when downloading CCleaner

In addition to the traditional version for downloading CCleaner, Piriform Ltd has developed two other modalities, CCleaner Browser, CCleaner Cloud and other versions such as Professional, Business or Technician.

CCleaner Browser

According to Piriform's description, CCleaner Browser is a high-security browser that protects users' personal data and allows you to conceal your digital footprint. However, Avast recently acquired this application, so this tool has become the Avast Secure Browser but using the CCleaner icon.

CCleaner Cloud

CCleaner Cloud is an alternative to downloading CCleaner in its traditional version. This is an online platform hosted in the cloud and allows you to clean and optimise your computer from there. The advantages are that it is free, functional and it isn't necessary to be in front of the computer to connect the PC to the Piriform server.

For those users who wish to opt for the advanced options, the paid version is available, through a subscription.

The CCleaner rating

Little more needs to be said apart from the 2 million downloads since its market launch. Although a free application, its features are not necessarily matched by those of paying competitors or those offering premium level options.

In short, it's a tool with a very intuitive and easy to use interface, which allows its users to enjoy all its advantages. Piriform updates are also frequent so it will continue to improve its functionality in the future.

Some other free alternatives to CCleaner you might want to consider are Clean Master and BleachBit.

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