Slab Serif
A slab serif is a typeface with thick, block-like serifs at near-perpendicular angles to the letter strokes. Slab serifs read as sturdy and confident, often used in editorial and branding contexts.
Example
In Practice
Slab serif typefaces have block-like serifs with no bracket connecting them to the letterform stroke. This gives them a more utilitarian, industrial character than traditional serifs. Slab-serifs like Roboto Slab and Libre Baskerville are used for headlines and body text in editorial and magazine-style designs. The robust serifs make them more legible at small sizes than many traditional serifs. Browse slab serif fonts in the font catalog.
Common Mistakes
The common mistake with most typographic terms is applying them without considering how they interact with other settings. Type is a system: changing kerning affects tracking, changing size affects leading, changing measure affects line-height. Test changes in context rather than in isolation.
Slab serifs: Where the weight does the talking
Slab serifs are the sturdy relatives of serif letters: their serifs are thick, square blocks rather than hairlines, and the overall stroke weight runs high. That construction gives them an industrial, confident voice that works in headlines, posters, and brands that want a physical, engineered feel. They take up visual space fast, so they are at their best in short bursts rather than long paragraphs.
In a web context, slabs pair cleanly with a humanist sans for body text, and the contrast between the two establishes hierarchy instantly. Because their default weight is heavy, set them at display sizes and keep the letter-spacing normal; extra spacing can make a slab look hollow. Bitter is the open-source slab in the catalog, and it carries the classic square serif feel at a weight that does not overwhelm a 40px headline.