iTOL provides What-You-See-Is-What-You-Get high quality export into several vector and bitmap graphics formats. Interactively adjust all tree and dataset visualization options as you like, and …

iTOL will be temporarily taken offline on January 4, 2026, at 9:00 CET for a major hardware upgrade. The expected downtime duration is between 3 and 6 hours, with full service …

iTOL is an online tool for the display, annotation and management of phylogenetic and other trees. Use the help sections below and different video tutorials to familiarize yourself with its …

If you want to keep them private and protected, or have multiple trees to visualize, we recommend creating an iTOL account. If you already have an account, please login first.

If you have any questions or encounter problems while using iTOL, please contact the developer. Tree management: working with workspaces and projects in your iTOL account

Creating an iTOL account will allow you to access your trees from any browser, organize them into workspaces and projects and easily manage datasets and other tree features.

We will be glad to provide free accounts for your students, with full iTOL access for the duration of the course. If you have any further questions, or need additional information, please contact us.

Here is a selection of user generated trees in iTOL. If you have an interesting tree you'd like to show here, or if you need help with creating something similar with your own data, please …

More information about iTOL subscriptions and modes of access is available here. Please note that the iTOL annotation editor subscribers automatically have full access to all iTOL features, …

iTOL is an online tool, accessible with any recent web browser (Figure 1). The display engine for the current version was completely re-written, implemented in pure Javascript and now uses …