This is a backup server running the last version of iTOL2. You can use it freely and upload new trees, but they will not be visible in current version of iTOL.

About iTOL


Default tree:Tree Of Life v1.0 (Ciccarelli FD, et al., Science.; 2006 Mar 3. 311(5765): 1283-7)
  • Letunic I and Bork P (2006) Bioinformatics 23(1):127-8 Interactive Tree Of Life (iTOL): an online tool for phylogenetic tree display and annotation (abstract, full article)
  • Letunic I and Bork P (2011) Nucleic Acids Res doi: 10.1093/nar/gkr201 Interactive Tree Of Life v2: online annotation and display of phylogenetic trees made easy (abstract, full article)

Local installations and customization of iTOL

If you are interested in running a customized version of iTOL in your own organization or institution, please contact biobyte solutions (visit or email for details. They provide the integration and customization of iTOL to fit your specific needs.

Recent changes and new features

Full version history

Known bugs and problems

iTOL requires Flash plugin version 7 or higher. For MS Windows users, we recommend version 8 or later. You can install or upgrade you Flash plugin by visting Adobe's Flash pages. Our prefered and most heavily tested browser is Firefox, which we recommend.

iTOL creates a very complex Flash object and can sometimes trigger bugs in the Flash player, causing a browser crash. Make sure you have the latest version of Flash installed to minimize such problems.

For unknown reasons, Flash player will sometimes (~1:50 chance) display the iTOL tree in low quality mode, even though it should be in high quality by default. It that happens, you can manually switch the mode by using the Flash player's right-click context menu.

Feedback and contact

We hope you find iTOL user-friendly and easy to use. However, we encourage everyone who:

to contact us. You can also use the following form to send quick feedback:

Thank you!

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