TreeLine (outliner)

TreeLine
Original authorDoug Bell
Initial release17 October 2001; 24 years ago (2001-10-17)
Stable release
3.2.1 / September, 2025
Written inPython
PlatformLinux, Windows
Available inEnglish, French, German
TypeOutliner, Personal information manager, XML editor
LicenseGNU General Public License
Websitetreeline.bellz.org

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.

File formats

Export

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.

Import

TreeLine can import plain text, tab indented, delimited table files, Mozilla and XBEL format bookmarks, generic XML files, ODF text documents and older TreeLine formats.

File format

TreeLine uses a simple JSON syntax to store data, with .trln extension. Versions before 3.0.0 used XML symtax with .trl extension.

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