As of January 9, 2018, Google Fonts had 848 font families, 114 of which are serif faces. Of those, the following 22 can handle Hanyu Pinyin with tone marks.
- Alegreya
- Alegreya SC
- Cormorant (Caveat: In the Cormorant fonts, the marks for tones 2-4 are nearly vertical, which may not provide sufficient distinction between them for many readers.)
- Cormorant Garamond
- Cormorant Infant
- Cormorant SC
- Cormorant Unicase
- Cormorant Upright (Caveat: The third-tone mark in ǚ is inverted.)
- David Libre
- EB Garamond
- Faustina
- Gentium Basic
- Gentium Book Basic
- Judson
- Maitree
- Manuale
- Noticia Text
- Noto Serif
- Pridi (Caveat: The mark for second tone and the apostrophe look very similar.)
- Taviraj
- Tinos
- Trirong