LibreCAD uses its own font format for various reasons. Based on its roots in QCAD, which used its own CXF format, LibreCAD enhanced this format in LFF (LibreCAD Font Format).

LibreCAD comes with a collection of common used fonts. Some of them are contributions from our community, others are converted from TTF fonts with our command line conversion tool ttf2lff.

When LibreCAD is installed from a binary package, chances are good, that the fonts are installed properly, and that they are available in text tools.
Their location depends on the used operating system.

If you have converted your own fonts, you can add an additional path in Application Preferences, that you can keep them separated from the deployed fonts.

For users who build LibreCAD themselves, they can find the font files on our Github repository

Because LFF is a LibreCAD feature, other CAD applications probably can't show texts in DXF drawings.
To share DXF with text with other CAD applications, create a copy of the drawing and explode all text. This makes them basic entities again and allow other CAD applications to show the text. The back draw is, that the exploded text is no longer editable as text.

• DXF showing all fonts - LibreCadFonts_2.1.3.dxf
• PDF export from this DXF - LibreCadFonts_2.1.3.pdf
• PNG export from this DXF -

Some fonts have performance issues. This depends on the number of entities defining a single letter. When there are fonts with mostly less than 10 entities per letter, there are others with 50 to well over 100 entities per Letter.