iTOL: Interactive Tree Of Life
It is with immense sadness that I share the news of the passing on 16 January 2026, of my colleague and friend Peer Bork.
Peer was a visionary, and his career was far too rich and intense to be summarized in just a few lines. His work on phylogenetics and the reconstruction of the Tree Of Life from fully sequenced genomes led to the initial idea and early development of iTOL. Without his leadership and support, it would never have grown into what it is.
You will be remembered forever.
Manage
Organize your trees into workspaces and projects, and access them from any browser. Simply drag and drop multiple tree files onto a project to upload them all at once.
Annotate
19 dataset types. Full control over branch colors, widths and styles. Individually adjustable label fonts, sizes and styles. Check our gallery of user created trees.
Export
Create high quality tree figures for your publications. Direct What-You-See-Is-What-You-Get export of what is displayed on the screen. Export into various vector or bitmap formats.
Visualize support values. Explore clade distances.
Branch support values and other metadata can be visualized as various shapes with adjustable colors and sizes or as text labels. Alternatively, branch colors or widths can be linked to the underlying data values.
Trees with branch length information can have an internal scale with adjustable levels and colors, allowing easy estimation of distances between various clades.