FileZilla is a free and open-source, cross-platform FTP application, consisting of FileZilla Client and FileZilla Server. Clients are available for Windows, Linux, and macOS. Both server and client support FTP and FTPS (FTP over SSL/TLS), while the client can in addition connect to SFTP servers. FileZilla's source code is hosted on SourceForge.

FileZilla Client
Developer(s)Tim Kosse
Initial release22 June 2001; 23 years ago (2001-06-22)
Stable release
3.67.0[1] Edit this on Wikidata / 15 April 2024
Written inC++, wxWidgets
Operating systemCross-platform
Size7.3 MB
Available inMultilingual
TypeFTP client



FileZilla was started as a computer science class project in the second week of January 2001 by Tim Kosse and two classmates.[3][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] Since its initial development in 2001, FileZilla has been released under the GNU General Public License (GPL).[5] The FileZilla client is currently released under GPL-2.0-or-later, and the server package under AGPL-3.0-or-later.[2]

FileZilla featured as SourceForge's Project of the Month in November 2003.[6]



FileZilla Client allows file transfer using both FTP and encrypted FTP such as FTPS (server and client) and SFTP,[7] with support for IPv6. One of its most notable features is its capability to pause and resume file transfer processes, even for files larger than 4GB. Users can chose to overwrite existing files based on the age or size of the file. It also allows the preservation of timestamps on transferred files, provided there is support from the local system when downloading or from the target server when uploading.[8]

FileZilla Client uses a tabbed user interface for multitasking, allowing users to browse more than one server or transfer files simultaneously between multiple servers. It also features a Site Manager to manage server lists and a transfer queue for ordering file transfer tasks. It has bookmarks for easy access and supports drag and drop for downloads and uploads. The software provides directory comparison for comparing local files and server files in the same directory. If there is a difference in the file details, such as a mismatch in name or size, the software will highlight the file in colour.

Other features include configurable transfer speed limits, filename filters, a network configuration wizard, remote file editing, keep-alive command to prevent disconnections when idle, HTTP/1.1, SOCKS5 and FTP-Proxy support, and logging events to a file for debugging. Additionally, users can export queues into an XML format file, browse directories synchronously, and remotely search for files on the server.

FileZilla Client is a cross-platform software, runs on Windows, Linux, *BSD, and Mac OS X, and available in 47 languages worldwide, including Arabic, Armenian, Basque, Bulgarian, Catalan, Chinese, Corsican, Croatian, Czech, Danish, Dutch, German, Greek, Estonian, Finnish, French, Galician, Hebrew, Hungarian, Indonesian, Icelandic, Italian, Japanese, Georgian, Khmer, Korean, Kurdish, Kyrgyz, Lithuanian, Latvian, Macedonian, Norwegian, Nepali, Occitan, Persian, Polish, Portuguese, Romanian, Russian, Serbian, Slovak, Slovenian, Spanish, Thai, Turkish, Ukrainian, and Vietnamese.

These are some features of FileZilla Server:[9]

  • 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."[10]

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."[11]

GoDaddy, Clarion University of Pennsylvania and National Capital FreeNet recommend FileZilla for uploading files to their web hosting services.[12][13][14]

FileZilla is available in the repositories of many Linux distributions, including Debian, Ubuntu, Trisquel and Parabola GNU/Linux-libre.[15][16][17][18]

In January 2012, CNET gave FileZilla their highest rating of "spectacular"—five out of five stars.[19]

As of 2022 FileZilla is regularly listed in articles on the top free software applications.[20]

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.[21][22]



Bundled adware issues


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.[22]

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".[22][23]

As of 2016, FileZilla displays ads (called sponsored updates) when starting the application. These ads appear as part of the "Check for updates" dialog.[24]

In 2018, a further controversy about FileZilla's use of a bundled adware installer caused concern.[25]

Plain text password storage


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.[26] A fork called FileZilla Secure was started in November 2016 to add encrypted storage.[27] In May 2017, encrypted storage was also added to the main version, 10 years after it was first requested.[28] Kosse maintained that the feature did not really increase security, as long as the operating system is not secure.[29]

FileZilla Server

FileZilla Server
Developer(s)Tim Kosse, et al.
Stable release
1.8.2[30]   / 26 April 2024
Written inC++
Operating systemLinux, MacOS, Windows
TypeFTP server
License2021[a]: AGPL-3.0-or-later[2]
2001[b]: GPL-2.0-or-later[31]

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.[32] FileZilla Server is currently available for Linux, MacOS and Windows platforms.

FileZilla Server is a free, open-source FTP server. Its source code is hosted on the FileZilla Project website.[33]



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

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

FileZilla Client issues


Unlike some other FTP clients, FileZilla Client does not implement a workaround for an error in the IIS server which causes file corruption when resuming large file downloads.[34]

Operating system support


FileZilla Client

Operating system Latest Version Release Year
Windows Windows 7 or later Current (x64) 2023
Current (IA-32)
Windows Vista 3.25.1 (x64) 2017
3.25.1 (IA-32)
Windows XP 3.8.0 2014
Windows 2000 2008
Windows 9x 2.2.22 2006
macOS 10.13 or later Current (ARM64) 2023
Current (x64)
10.11-10.12 3.58.0 2022
10.9-10.10 3.42.1 2019
10.7-10.8 3.24.1 2017
10.6 3.8.1 2014
10.5 3.8.1 (Intel)
3.8.0 (PPC)
10.4 3.0.6 (Intel) 2008
3.0.6 (PPC)
Linux Current (x64) 2023
Current (IA-32)

See also



  1. ^ AGPL-3.0-or-later since 2021, version 1.0.0.
  2. ^ GPL-2.0-or-later from 2001 until 2021.


  1. ^ "3.67.0 (2024-04-15)". 15 April 2024. Retrieved 16 April 2024.
  2. ^ a b c "FileZilla - License". Archived from the original on 22 January 2023.
  3. ^ Orin, Andy (20 August 2015). "Behind the App: The Story of FileZilla". Lifehacker. Archived from the original on 21 August 2015. Retrieved 28 March 2019. Yes, it started as a group project in the computer science course during my final year at school, almost 15 years ago. We were looking for something usable that was neither too trivial nor too big to implement and could be worked upon in parallel. Sadly I don't remember the details anymore how we eventually settled on an FTP client.
  4. ^ a b c Kosse, Tim. "FileZilla History". SourceForge. DHI Group. Archived from the original on 23 April 2008. Retrieved 4 November 2015.
  5. ^ "Project: FileZilla". 11 June 2001. Archived from the original on 10 July 2001. Retrieved 5 March 2023.
  6. ^ "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.
  7. ^ "Tim Kosse on Filezilla". Blue-GNU. 13 September 2009. Archived from the original on 17 September 2007. Retrieved 29 March 2019. In order to support the SFTP protocol, FileZilla uses code from PuTTY. SSL/TLS support is provided by GnuTLS.
  8. ^ "How to Preserve Timestamps FileZilla Pro". FileZilla Pro. Retrieved 1 November 2021.
  9. ^ "FileZilla FTP Server - FileZilla Wiki".
  10. ^ Foresman, Chris (15 May 2008). "First Look: Cyberduck 3 is a great, free FTP client for Mac". Ars Technica. Retrieved 7 January 2012.
  11. ^ Protalinski, Emil (1 August 2008). "Friday evening Microsoft links, FileZilla edition". Ars Technica. Retrieved 7 January 2012.
  12. ^ "Connecting to Your Hosting Account with FileZilla (FTP)". Go Daddy. 2012. Retrieved 7 January 2012.
  13. ^ "Share and Retrieve Files on the Clarion Network ("Jupiter" space)". Clarion University of Pennsylvania. Retrieved 7 January 2012.
  14. ^ "Publishing Web Pages". National Capital Freenet. Retrieved 7 January 2012.
  15. ^ "Package: filezilla (". Debian. Retrieved 17 October 2015.
  16. ^ "filezilla package in Ubuntu". Ubuntu. Canonical Ltd. Retrieved 7 January 2012.
  17. ^ "Package: filezilla (3.7.3-1ubuntu1)". Trisquel. Retrieved 17 October 2015.
  18. ^ "Parabola/Linux-libre - Package Database". Parabola GNU/Linux-libre. Retrieved 17 October 2015.
  19. ^ "FileZilla". CBS Interactive. 16 April 2014. Retrieved 17 October 2015.
  20. ^ Griffith, Eric (2 July 2020). "The Best Free Software of 2020". PCMag Australia. Retrieved 2 September 2022.
  21. ^ Taggart, Jean (8 November 2013). "Sourceforge Drives off Downloads, ask why". Malwarebytes. Retrieved 16 September 2014.
  22. ^ a b c Brinkmann, Martin (17 July 2013). "SourceForge's New Installer Bundles Program Downloads with Adware". Ghacks. Retrieved 16 September 2014.
  23. ^ "Mind the PUP: Top download portals to avoid - Emsisoft - Security Blog". 11 March 2015. Retrieved 8 June 2018.
  24. ^ "FileZilla - Sponsored Updates". Retrieved 12 September 2016.
  25. ^ "FileZilla's Use of Bundled Offers Sparks Outrage From Users". Retrieved 6 January 2019.
  26. ^ "Missing password feature now poses a serious security threat". Filezilla forums. Retrieved 29 May 2017.
  27. ^ FileZillaSecure. "FileZilla Secure - Dedicated to keeping your FTP passwords secure". Retrieved 23 November 2016.
  28. ^ Cimpanu, Catalin (26 May 2017). "FileZilla FTP Client Adds Support for Master Password That Encrypts Your Logins". Bleeping Computer. Retrieved 29 May 2017.
  29. ^ "FileZilla 3 development diary". Retrieved 29 May 2017.
  30. ^ "1.8.2 (2024-04-26)". 26 April 2024. Retrieved 27 April 2024.
  31. ^ "FileZilla - License". Archived from the original on 3 August 2021.
  32. ^ Trapani, Gina (January 2008). "Build a Home FTP Server with FileZilla". Retrieved 14 January 2012.
  33. ^ "Download FileZilla Server".
  34. ^ FileZilla. "#4672 (Download continues past 100% corrupting downloaded file)". Retrieved 12 September 2016.