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FileZilla Client[edit]

FileZilla Icon
FileZilla 3.3.1.png
FileZilla 3.3.1 on Ubuntu 10.04
Developer(s) Tim Kosse
Initial release 22 June 2001 (2001-06-22)
Repository [{{#property:P1324}} {{#property:P1324}}]
Written in C++, wxWidgets
Operating system Cross-platform
Available in Multilingual
Type FTP client
License GNU General Public License Version 2

FileZilla is free and cross-platform FTP software, consisting of FileZilla Client and FileZilla Server. Binaries are available for Windows, Linux, and Mac OS X. It supports FTP, SFTP, and FTPS (FTP over |SSL/TLS). As of 18 April 2011, FileZilla Client was the 7th most popular download of all time from[1] Support for SFTP (SSH File Transfer Protocol) is not implemented in Filezilla Server.[2]

FileZilla's source code is hosted on The project was featured as Project of the Month in November 2003.[3]


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


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."[5]

Writing for Ars Technica in August 2008 Emil Protalinski said: "this week's free, third-party application recommendation is FileZilla, which has been recently updated to version 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."[6]

Go Daddy, Clarion University of Pennsylvania and National Capital Freenet recommend FileZilla for uploading files to their web hosting services.[7][8][9]

FileZilla is available in the repositories of many Linux distributions, including Debian, Ubuntu, Trisquel and Parabola GNU/Linux.[10][11][12][13]


From version 3 onwards, Filezilla stores all saved usernames and passwords as plain text files. This allows any malware that has gained access to the user's system to simply read the data stored in these files and to remotely transfer this data to the attacker. FileZilla's author has responded to such criticism saying "If your system is secure, you can use nuclear missile launch codes as desktop background."[14] This contrasts with the standard security concept for Defense in Depth, with multiple layers to prevent such attacks.

The practice of saving plaintext passwords is, however, sometimes considered a better practice than a false sense of security, as some people characterize the effects of password encryption.[15]

Storing encrypted private key files is still supported, as well as using ssh-agent, in the same way as previous versions of Filezilla. Private key authentication is usually recommended over password-based authentication.[16]

FileZilla Server[edit]

FileZilla Server
FileZilla Icon
FileZilla server.png
FileZilla Server main interface
Developer(s) Tim Kosse, et al.
Repository [{{#property:P1324}} {{#property:P1324}}]
Written in C++
Operating system Windows
Type FTP server
License GPL

FileZilla Server is a sister product of FileZilla Client. It is an FTP server supported by the same project and features support for FTP and FTP over SSL/TLS.[17]

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).[18] It includes numerous functionalities, including:

  • Compression
  • Encryption with SSL/TLS (for FTPS)


When downloading large files from an IIS server, Filezilla will continue to download greater than 100% of the file. This results in corrupting the file download.[19]

See also[edit]

  • List of FTP server software
  • Comparison of FTP client software

External links[edit]


  1. All-Time Top Downloads
  2. "FileZilla FTP Server - FileZilla Wiki". Retrieved 2012-08-27.
  3. Project of the Month (2003-11)
  4. < FileZilla history
  5. Foresman, Chris (15 May 2008). "First Look: Cyberduck 3 is a great, free FTP client for Mac". Ars Technica. Retrieved 7 January 2012.
  6. Protalinski, Emil (1 August 2008). "Friday evening Microsoft links, FileZilla edition". Ars Technica. Retrieved 7 January 2012.
  7. Go Daddy (2012). "Connecting to Your Hosting Account with FileZilla (FTP)". Retrieved 7 January 2012.
  8. Clarion University of Pennsylvania (2008). "Share and Retrieve Files on the Clarion Network ("Jupiter" space)". Retrieved 7 January 2012.
  9. National Capital Freenet (January 2012). "Publishing Web Pages". Retrieved 7 January 2012.
  10. Debian (2012). "Package: filezilla (3.3.3-1)". Retrieved 7 January 2012.
  11. Canonical Ltd (December 2011). "“filezilla” package in Ubuntu". Retrieved 7 January 2012.
  12. Trisquel (2012). "Trisquel -- Package Search Results -- filezilla". Retrieved 4 June 2012.
  13. Parabola GNU/Linux (April 2012). "Parabola - Package Database". Retrieved 4 June 2012.
  14. Kosse, Tim (23 February 2004). "Hide password File?". Retrieved 17 August 2012.
  15. "Plain Text Passwords – Pidgin – Trac". Retrieved 2012-08-27.
  16. "SSH/OpenSSH/Keys - Community Ubuntu Documentation". 2011-03-20. Retrieved 2012-08-27.
  17. Trapani, Gina (January 2008). "Build a Home FTP Server with FileZilla". Retrieved 14 January 2012.
  18. FileZilla Project, FileZilla FTP Server, accessed: 8 April 2012
  19. Ticket #4672 (assigned Bug report) - Download continues past 100% corrupting downloaded zip file