TreeLine (outliner)

  (Redirected from Treeline outliner)

TreeLine is a free and simple outliner with advanced data element definition and export abilities. It uses a basic tree structure to organize information, and allows the user to define different types of nodes and leaves.

Initial release2001
Stable release
3.0.0 / August, 2018
Written inPython
PlatformLinux, Windows
Available inEnglish, French, German
LicenseGNU General Public License

File formatsEdit


TreeLine outlines can be exported as HTML, per-data type user defined formatting. In addition, it supports exporting outlines as an OpenDocument ODT file, OPML, various delimited text file formats, and as "plain" XML.


TreeLine can open "plain" XML files, displaying the contents as an outline. It can import browser bookmarks.

File formatEdit

TreeLine uses a simple XML syntax to store data, with a .trl extension.

Similar programsEdit

Zim, Wixi, KeepNote, KJots, Tomboy, Notecase, Gnudiary, Basket, GNote, Tiddlywiki,

External linksEdit