Source Serif

Source Serif (known as Source Serif Pro before 2021) is a serif typeface created by Frank Grießhammer for Adobe Systems. It is the third open-source font family from Adobe, distributed under the SIL Open Font License. The typeface is inspired by the forms of Pierre Simon Fournier and is a complementary design to the Source Sans family. It is available in six weights in upright styles and italics, and five optical sizes. It is also available as a variable font with continuous weights from 200 to 900. The first version, named "Source Serif Pro", was released in 2014. Version 2.0 was released in 2017 and introduced support for more Latin characters, Cyrillic, and Greek. In 2018, Latin italics were added in version "2.007R-ro/1.007R-it". In 2019, Greek and Cyrillic italic were added in version "3.000R". In 2021, a new release added optical sizes; the name "Pro" was dropped at this point.

From the Wikipedia article “Source Serif”, licensed under CC BY-SA 4.0.

Serif typefaces like this are the traditional choice for book body text: the serifs guide the eye along the line in long passages. Set novels at 10.5–12 pt with 125–140% leading.

Commercial typefaces require a licence that covers embedding in PDFs and ebooks; check the foundry's licence before you publish.