Hello,
thank you for the details. The tools Edit PDF, Annotate PDF and Sign PDF in the PDF24 Toolbox currently only list fonts that are installed as TrueType files (.ttf), from the Windows font folder and from the fonts installed for your user. Fonts installed as OpenType files (.otf), which is often the case for Source Sans Pro and Univers LT, do not appear in the font list. We will add support for .otf fonts to our list.
Until then:
- If the font is also available as a .ttf file, install that version. Then close the Toolbox and open it again, because the font list is read when the Toolbox window opens.
- Or use Edit PDF online: in the font list for text you can load your own font file with + Load custom font… (.ttf or .otf). In Chrome and Edge, Installed fonts… also offers the fonts installed on your computer: https://tools.pdf24.org/en/edit-pdf
If your font is a .ttf file and still does not appear in the list, please tell us the file name of the font and your PDF24 version.