The safe, secure and completely free way to transfer large files around the Web.

What is ZendTo?

It is a classic problem: you need to send files to someone, or they need to send them to you, and there's no way except email. But they are too large or your administrator won't let you transfer the files by email at all. ZendTo to the rescue!

Why ZendTo?

ZendTo is a completely free web-based system, which you can run on your own server with complete safety and security. It runs from any Linux or Unix server or virtualisation system and there is no size limit and it will send files one and a half times faster than by email. It will also integrate with any Active Directory, LDAP or IMAP system you already have in place.

If you are in a customer service organisation, ZendTo can integrate with your customer service ticketing system so that all your references are kept in one place.

We provide full technical support by telephone or email, all completely free.



  • 18/02/2017 - A new beta 4.23-2 released. HTML email messages, simpler email configuration, upload progress bar that works with PHP 7 and Ubuntu 16, simpler to install. To try it out, please see the beta page. For full details of the changes, see the ChangeLog.
  • 06/02/2017 - 4.20-6 released. Data leak removed, and should now work on PHP 5.2 as well, cosmetic bug fixed, bug fixed where lifetime of new drop-off was missing from email sent to recipients.
  • 30/01/2017 - 4.20-3 released. Bug-fixes: cleanup.php was not working, IMAP authenticator should now work well with Exchange and Office365.
  • 20/01/2017 - New version 4.20 released. See the Change Log for details on what is new.
  • 19/01/2017 - Release Candidate available for the new version.
  • 12/01/2017 - Another updated beta fixing Google reCAPTCHA problems, and sadly disabling the upload progress bar in Ubuntu 16 only.
  • 04/01/2017 - Another new beta release, fixing a few bugs and including the tool to upgrade your preferences.php file automatically.
  • 22/12/2016 - You can now automatically upgrade your preferences.php file too. See the beta news page for more information. The tool is now in /opt/zendto/bin.
  • 19/12/2016 - New beta release, including brand new installer.
  • 04/11/2016 - I am working on an updated release. This will fix all known bugs (security and otherwise) and will work on CentOS 7 with SELinux.
  • 06/06/2015 - Production release 4.12-5. There have been no bugs reported in the last few days, and I think this version is good to go. It should work fine on production systems. Make sure if you are using MySQL that you check the "sql" directory as there is a new command for you to run to update the schema (which needs the '--force' option).
Download ZendTo


Download NowVersion 4.20 (6 February 2017)
Keep up to date on the latest version info and news right here on the ZendTo website
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Electronics and Computer Science, University of Southampton