Piriform
Piriform is a London-based software brand best known for CCleaner and other Windows system-maintenance utilities.
Last updated August 26, 2026
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Overview
Piriform is a United Kingdom software company and brand headquartered in London. It became known internationally for a group of lightweight utilities designed to maintain, diagnose, clean, recover, and optimize personal computers. Its best-known product is CCleaner, a system-cleaning application first released for Microsoft Windows in 2004. CCleaner developed a large user base by offering tools for removing temporary files, browser data, caches, logs, recycle-bin contents, memory dumps, and other potentially unwanted data. It also included facilities for managing startup programs, uninstalling applications, examining parts of the Windows Registry, wiping free space, and, in later versions, updating software and drivers. Piriform's product portfolio expanded beyond CCleaner. Recuva was positioned as a file-recovery utility for restoring deleted files from hard drives, removable media, and other storage devices. Defraggler provided disk-defragmentation and drive-optimization functions, while Speccy presented detailed information about a computer's hardware and operating environment. The portfolio reflected Piriform's original consumer-software strategy: relatively focused utilities that were easy to download and use, with free editions complemented by paid or professional capabilities. CCleaner was initially a Windows-only product. Piriform later broadened its platform reach with a macOS release, an Android edition, and, much later, an iOS application. It also introduced commercial and network-oriented editions for managed deployments. A Chromium-based CCleaner Browser became another part of the product ecosystem, offering features such as advertising blocking and anti-tracking. The browser was distributed as a separate product and, in some installation flows, as an optional addition to CCleaner. The company became part of a larger cybersecurity and privacy-software group when Avast acquired Piriform in July 2017. After Avast's subsequent combination with NortonLifeLock, Piriform became part of the organization now known as Gen Digital, whose portfolio includes consumer security, privacy, identity, and utility products. Piriform's products therefore operate within a broader commercial and technical ecosystem rather than as an independent publicly listed company. Piriform's history has also been shaped by significant trust and security controversies. In 2017, a compromised version of CCleaner was distributed with the Floxif malware, creating a backdoor on affected systems and leading to a major incident involving a widely distributed consumer application. In 2019, Avast disclosed another attempt to compromise the CCleaner release process; that attempt was detected and did not result in a successful malicious release. The company also faced criticism over data-collection behavior in CCleaner 5.45 and over the inclusion of third-party software in some installers. Piriform and its parent organizations responded with product changes, clearer controls, and optional installation of bundled software. Today, Piriform remains primarily associated with CCleaner and the broader category of consumer system-utility software. Its positioning combines convenience, system maintenance, privacy-oriented cleanup, and accessible diagnostics. The brand's reputation is consequently dual-sided: it has substantial historical recognition and a long-established product franchise, but its stewardship of software distribution, telemetry, bundled offers, and supply-chain security has been closely scrutinized.
History
Piriform developed a reputation through focused utility software for personal computers. Its most important product, CCleaner, launched for Microsoft Windows in 2004 and targeted the accumulation of temporary files, browser traces, caches, logs, and other system residue. The product also offered tools for managing startup entries, uninstalling software, inspecting Registry-related problems, deleting restore points, and wiping free space. Its simple interface and free distribution helped it become one of the most recognized system-cleaning utilities. The company broadened its portfolio with Recuva, a file-recovery product; Defraggler, a disk-defragmentation utility; and Speccy, a hardware and system-information tool. These products reinforced a common brand proposition centered on practical maintenance rather than enterprise infrastructure. CCleaner was initially restricted to Windows, but Piriform later introduced a Mac version following a public beta program announced in 2011. Android support arrived in 2014, and an iOS version followed in 2023. Commercial and network editions were also developed for organizational use. Piriform's growth made CCleaner a significant software-distribution property. The company reported two billion CCleaner downloads by 2016, and the application received strong reviews from several technology publications. Its distribution strategy included free editions, paid upgrades, professional functions, and optional additional software. Piriform also introduced CCleaner Browser, a Chromium-based Windows browser with built-in advertising-blocking and anti-tracking features. In July 2017, Avast acquired Piriform. Shortly afterward, a compromised CCleaner 5.33 release was found to contain the Floxif trojan. The malicious code could establish a backdoor, and the incident was particularly serious because the affected application had a large installed base and was distributed through an apparently trusted software channel. A subsequent release removed the malicious code. In 2019, Avast reported another attempted intrusion into the CCleaner release process, but the effort did not successfully place malware in released software. The brand also encountered criticism about privacy controls and installer practices. CCleaner 5.45 contained an Active Monitoring behavior that re-enabled itself because of a coding error. Piriform said the component was not transmitting the information alleged by critics, renamed the function Smart Cleaning, and revised controls around telemetry. Separately, some installers offered Avast or other third-party software. In 2020, Microsoft Defender identified the free installer as a potentially unwanted application because of that bundling behavior. Piriform subsequently made third-party installation optional. Following Avast's merger with NortonLifeLock, Piriform became part of Gen Digital. The brand continues to operate as a utility-software business within that wider group. Its history combines strong consumer recognition and broad distribution with recurring scrutiny of privacy, bundling, and software-supply-chain practices.
- 2023
CCleaner reaches iOS
[1]An iOS version of CCleaner is released through Apple's App Store.
- 2020
Third-party installer offers made optional
[1]Following Microsoft Defender's classification of the free installer as potentially unwanted because of bundled software, Piriform changes the installation flow.
- 2019
Second release-process intrusion attempt disclosed
[1]Avast reports an attempted attack on the CCleaner release process that did not result in a successful malicious release.
- 2017
Piriform acquired by Avast
[1]Avast acquires Piriform and adds its utility products to the Avast portfolio.
- 2017
CCleaner supply-chain malware incident
[1]A compromised CCleaner release is distributed with the Floxif trojan, prompting emergency updates and security investigation.
- 2016
Two-billion-download milestone reported
[1]Piriform announces that CCleaner has reached two billion downloads worldwide.
- 2014
Android edition released
[1]Piriform releases CCleaner for Android, extending the brand to mobile devices.
- 2012
CCleaner expands to macOS
[1]The Mac version progresses from testing to release, ending the product's Windows-only period.
- 2011
Mac beta program announced
[1]Piriform announces a public beta program for a Mac edition of CCleaner.
- 2004
CCleaner launches for Windows
[1]Piriform's best-known utility is first released for Microsoft Windows as a system-cleaning and maintenance application.
Products and positioning
Accessible consumer and small-business software for cleaning, maintaining, diagnosing, recovering, and optimizing computers and mobile devices.
System maintenance and privacy utility · 2004
CCleaner
Piriform's flagship product cleans temporary and potentially unwanted files from operating systems and applications. It can remove browser histories, cookies, caches, logs, memory dumps, recycle-bin contents, and other residual data. Related functions include application uninstalling, startup management, Registry inspection, restore-point deletion, free-space wiping, and, in later versions, software and driver updating. Editions have been offered for Windows, macOS, Android, and iOS, alongside commercial and network-oriented variants.
File recovery software
Recuva
Recuva is a recovery utility designed to help users locate and restore deleted files. Its use cases include accidental deletion, emptied recycle bins, removable storage, and other common consumer data-loss situations. It complements CCleaner by addressing recovery and storage management rather than only deletion and cleanup.
Disk optimization utility
Defraggler
Defraggler is a disk-defragmentation and storage-optimization tool associated with Piriform. It was designed to provide more targeted control over disk defragmentation than the standard operating-system experience, including attention to individual files or groups of files where supported.
Hardware information utility
Speccy
Speccy provides an overview of a computer's hardware and system configuration. It is intended for users who need accessible information about components, operating-system details, and system characteristics without relying on complex administrative tools.
Web browser
CCleaner Browser
CCleaner Browser is a Windows browser built on Chromium. It incorporates privacy and convenience features including advertising blocking and anti-tracking capabilities. The product is part of the same broader portfolio as Avast Secure Browser within the parent company's consumer software group.
Controversies
2020
Microsoft Defender potentially unwanted application classification
Microsoft Defender flagged the free CCleaner installer because it bundled third-party applications. Microsoft said such bundling could create unexpected activity and negatively affect users. Piriform subsequently made third-party installation optional.
2019
Attempted second compromise of CCleaner releases
Avast disclosed that attackers had tried to insert malware into CCleaner releases. The attempt was unsuccessful, but it heightened attention on the security of the product's build and release infrastructure.
2018
Active Monitoring and telemetry criticism
CCleaner 5.45 contained an error that caused Active Monitoring to turn itself back on. Piriform stated that the component did not report the information claimed by critics, renamed it Smart Cleaning, and revised data-collection controls and disclosures.
2018
Bundled antivirus software criticism
Reports criticized CCleaner installation flows that offered or installed Avast Antivirus without sufficiently clear user consent. Piriform disputed the characterization and later adjusted installer behavior.
2017
Floxif malware in CCleaner distribution
A compromised CCleaner 5.33 distribution included the Floxif trojan and could create a backdoor on affected systems. The incident was notable because malicious code entered a trusted software distribution channel and reached a very large installed base. Piriform released clean versions of the affected products.
Brand decisions
2020
Make third-party installer offers optionalStrategyBackground
Microsoft Defender criticized the inclusion of third-party software in the free CCleaner installation experience.
Action taken
Piriform updated the installer so that third-party software installation was optional.
Aftermath
The change reduced the risk that users would receive additional software without an affirmative installation choice.
2017
Join Avast's software portfolioM&ABackground
Piriform's large consumer utility user base and recognized CCleaner brand made it strategically relevant to Avast's consumer security portfolio.
Action taken
Avast acquired Piriform in July 2017.
Aftermath
Piriform products became part of Avast and later Gen Digital.
2012
Expand CCleaner beyond WindowsStrategyBackground
CCleaner had established itself as a Windows utility, but Piriform sought to extend the brand to users of Apple's desktop platform.
Action taken
The company moved a Mac edition from public beta into release.
Aftermath
CCleaner became a multi-platform product rather than a Windows-only utility.
Recent events
- 2017
Avast acquires Piriform[1]
M&A
Avast acquired Piriform, bringing CCleaner and the company's other utility products into its security-software portfolio.
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