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FileZilla Client
FileZilla Icon
FileZilla 3.7.3.png
FileZilla 3.7.3 running under Ubuntu MATE
Developer(s)Tim Kosse
Initial release22 June 2001; 17 years ago (2001-06-22)
Stable release3.37.4 (4 October 2018; 42 days ago (2018-10-04)) [±][1]
Preview release3.33.0-rc1 (27 April 2018; 6 months ago (2018-04-27)) [±][2]
Repository Edit this at Wikidata
Written inC++, wxWidgets
Operating systemCross-platform
Size7.3 MB
Available inMultilingual
TypeFTP client
LicenseGNU General Public License Version 2

FileZilla is a free software, cross-platform FTP application, consisting of FileZilla Client and FileZilla Server. Client binaries are available for Windows, Linux, and macOS, server binaries are available for Windows only. Both server and client support FTP and FTPS (FTP over SSL/TLS), while the client in addition also can connect to SFTP servers.

FileZilla's source code is hosted on SourceForge and the project was featured as Project of the Month in November 2003.[3] However, there have been criticisms that SourceForge bundles malicious software with the application.


FileZilla was started as a computer science class project in the second week of January 2001 by Tim Kosse and two classmates.[who?][4] Before they started to write the code, they discussed under which license they should release it.[4] They decided to make FileZilla an open-source project because many FTP clients were already available, and they didn't think that they would sell a single copy if they made FileZilla commercial.[4]


These are some features of FileZilla Client.[5]

  • Transfer files using FTP and encrypted FTP such as FTPS (server and client) and SFTP
  • Support IPv6 which is the latest version of internet protocol
  • Available in 47 languages worldwide (Arabic, Armenian, Basque, Bulgarian, Catalan, Chinese, Corsican, Croatian, Czech, Danish, Dutch, German, Greek, Estonian, Finnish, French, Gallegan, Hebrew, Hungarian, Indonesian, Icelandic, Italian, Japanese, Georgian, Khmer, Korean, Kurdish, Kyrgyz, Lithuanian, Latvian, Macedonian, Norwegian, Nepali, Occitan, Persian (Farsi), Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Thai, Turkish, Ukrainian, Vietnamese)
  • Supports resume which means the file transfer process can be paused and continued
  • Tabbed user interface for multitasking, to allow browsing more than one server or even transfer files simultaneously between multiple servers.
  • Site Manager to manage server lists and transfer queue for ordering file transfer tasks
  • Bookmarks for easy access to most frequent use
  • Drag and drop to download and upload.
  • Directory comparison for comparing local files and server files in the same directory. When the file doesn't have the same information (name not match, or size not match) it will highlight that file in colour.
  • Configurable transfer speed limits to limit the speed transferring the files, which helps reducing error of transferring
  • Filename filters, users can filter only specific files that have the conditions they want.
  • Network configuration wizard, help configuring confusing network settings in form of step-by-step wizard
  • Remote file editing, for quickly edit file on server side on-the-fly. No need to download, edit on the computer and re-upload back to the server.
  • Keep-alive, if the connection has been idle for the long time it will check by sending keep-alive command.
  • HTTP/1.1, SOCKS5 and FTP-Proxy support
  • Logging to file
  • Synchronised directory browsing
  • Remote file search to search file on the server remotely
  • Cross-platform. Runs on Windows, Linux, *BSD, Mac OS X
  • Supports resume and transfer of large files >4GB
  • Secure password storage protected with a master password

These are some features of FileZilla Server.[6]

  • FTP and FTP over TLS (FTPS)
  • IPv6 support
  • Speed limits
  • Large file support >4GB
  • Remote administration
  • Permissions system with users and groups
  • IP filters


In May 2008, Chris Foresman assessed FTP clients for Ars Technica, saying of FileZilla: "Some friends in the tech support world often recommend the free and open-source FileZilla, which offers a Mac OS X version in addition to Windows and Linux. But I've never been thrilled about its busy interface, which can be daunting for novice users."[7]

Writing for Ars Technica in August 2008 Emil Protalinski said: "this week's free, third-party application recommendation is FileZilla.... This FTP client is very quick and is regularly updated. It may not have a beautiful GUI, but it certainly is fast and has never let me down."[8]

Go Daddy, Clarion University of Pennsylvania and National Capital FreeNet recommend FileZilla for uploading files to their web hosting services.[9][10][11]

FileZilla is available in the repositories of many Linux distributions, including Debian, Ubuntu, Trisquel and Parabola GNU/Linux-libre.[12][13][14][15]

In January 2012, CNET gave FileZilla their highest rating of "spectacular"—five out of five stars.[16]

Since the project's participation in SourceForge's program to create revenue by adware, several reviewers started warning about downloading FileZilla and discouraged users from using it.[17][18]


Bundled adware issues[edit]

In 2013 the project's hosting site,, provided the main download of FileZilla with a download wrapper, "offering" additional software for the user to install. Numerous users reported that some of the adware installed without consent, despite declining all install requests, or used deception to obtain the user's "acceptance" to install. Among the reported effects are: web browser being hijacked, with content, start page and search engines being forcibly changed, popup windows, privacy or spying issues, sudden shutdown and restart events possibly leading to loss of current work. Some of the adware was reported to resist removal or restoration of previous settings, or were said to reinstall after a supposed removal. Also, users reported adware programs to download and install more unwanted software, some causing alerts by security suites, for being malware.[18]

The FileZilla webpage offers additional download options without adware installs, but the link to the adware download appears as the primary link, highlighted and marked as "recommended".[18][19]

As of 2016, FileZilla displays ads (called sponsored updates) when starting the application. These ads appear as part of the "Check for updates" dialog.[20]

Plain text password storage[edit]

Until version 3.26 FileZilla stored all saved usernames and passwords as plain text, allowing any malware that had gained even limited access to the user's system to read the data. FileZilla author Tim Kosse was reluctant to add encrypted storage. He stated that it gives a false sense of security, since well-crafted malware can include a keylogger that reads the master password used to secure the data. Users have argued that reading the master password to decrypt the encrypted storage is still harder than just reading the unencrypted storage.[21] A fork called FileZilla Secure was started in November 2016 to add encrypted storage.[22] In May 2017, encrypted storage was also added to the main version, 10 years after it was first requested.[23] Kosse maintained that the feature did not really increase security, as long as the operating system is not secure.[24]

FileZilla Server[edit]

FileZilla Server
FileZilla Icon
FileZilla server.png
FileZilla Server main interface
Developer(s)Tim Kosse, et al.
Stable release0.9.60.2 (8 February 2017; 20 months ago (2017-02-08)) [±][25]
Preview releasenone (n/a) [±]
Repository Edit this at Wikidata
Written inC++
Operating systemWindows
TypeFTP server

FileZilla Server is a sister product to FileZilla Client. It is an FTP server supported by the same project and features support for FTP and FTP over SSL/TLS.[26] FileZilla Server is currently available only on the Windows platform.

FileZilla Server is a free, open source FTP server. Its source code is hosted on


FileZilla Server supports FTP and FTPS (FTP over SSL/TLS).[citation needed] Other features include:

  • Compression with DEFLATE (MODE Z)
  • Encryption with SSL/TLS (for FTPS)
  • Per-user permissions on the underlying file system
  • GUI configuration tool
  • Speed limits


Unlike some other FTP clients, FileZilla does not implement a workaround for an error in the IIS server which causes file corruption when resuming large file downloads.[27]

See also[edit]


  1. ^ "Version history". FileZilla. 4 October 2018. Retrieved 4 October 2018.
  2. ^ "FileZilla - Version history". Retrieved 8 May 2018.
  3. ^ "Project of the Month, November 2003: FileZilla". SourceForge. VA Software. 31 October 2003. Archived from the original on 17 February 2014. Retrieved 17 February 2014.
  4. ^ a b c Kosse, Tim. "FileZilla History". SourceForge. DHI Group. Archived from the original on 2008-04-23. Retrieved 2015-11-04.
  5. ^ "FileZilla features". FileZilla project website. FileZilla. Retrieved 16 May 2014.
  6. ^ "FileZilla FTP Server".
  7. ^ Foresman, Chris (15 May 2008). "First Look: Cyberduck 3 is a great, free FTP client for Mac". Ars Technica. Retrieved 7 January 2012.
  8. ^ Protalinski, Emil (1 August 2008). "Friday evening Microsoft links, FileZilla edition". Ars Technica. Retrieved 7 January 2012.
  9. ^ "Connecting to Your Hosting Account with FileZilla (FTP)". Go Daddy. 2012. Retrieved 7 January 2012.
  10. ^ "Share and Retrieve Files on the Clarion Network ("Jupiter" space)". Clarion University of Pennsylvania. Retrieved 7 January 2012.
  11. ^ "Publishing Web Pages". National Capital Freenet. Retrieved 7 January 2012.
  12. ^ "Package: filezilla (". Debian. Retrieved 17 October 2015.
  13. ^ "filezilla package in Ubuntu". Ubuntu. Canonical Ltd. Retrieved 7 January 2012.
  14. ^ "Package: filezilla (3.7.3-1ubuntu1)". Trisquel. Retrieved 17 October 2015.
  15. ^ "Parabola/Linux-libre - Package Database". Parabola GNU/Linux-libre. Retrieved 17 October 2015.
  16. ^ "FileZilla". CBS Interactive. 16 April 2014. Retrieved 17 October 2015.
  17. ^ Taggart, Jean (8 November 2013). "Sourceforge Drives off Downloads, ask why". Malwarebytes. Retrieved 16 September 2014.
  18. ^ a b c Brinkmann, Martin (17 July 2013). "SourceForge's New Installer Bundles Program Downloads with Adware". Ghacks. Retrieved 16 September 2014.
  19. ^ "Mind the PUP: Top download portals to avoid - Emsisoft - Security Blog". Retrieved 8 June 2018.
  20. ^ "FileZilla - Sponsored Updates". Retrieved 12 September 2016.
  21. ^ "Missing password feature now poses a serious security threat". Filezilla forums. Retrieved 29 May 2017.
  22. ^ FileZillaSecure. "FileZilla Secure - Dedicated to keeping your FTP passwords secure". Retrieved 23 November 2016.
  23. ^ Cimpanu, Catalin (26 May 2017). "FileZilla FTP Client Adds Support for Master Password That Encrypts Your Logins". Bleeping Computer. Retrieved 29 May 2017.
  24. ^ "FileZilla 3 development diary". Retrieved 29 May 2017.
  25. ^ "Version history". FileZilla. 8 February 2017. Retrieved 9 March 2017.
  26. ^ Trapani, Gina (January 2008). "Build a Home FTP Server with FileZilla". Retrieved 14 January 2012.
  27. ^ FileZilla. "#4672 (Download continues past 100% corrupting downloaded file)". Retrieved 12 September 2016.

External links[edit]