Slab Square Opbo 4 is a regular weight, narrow, low contrast, upright, short x-height font.
Keywords: book text, editorial, headlines, packaging, institutional, classic, bookish, trustworthy, formal, readability, traditional tone, space economy, print texture, clarity, bracketed, sturdy, crisp, compact, ink-trap-like.
A compact slab-serif with sturdy, bracketed serifs and largely low-contrast strokes. The forms feel slightly condensed, with tight counters and a relatively short x-height that emphasizes ascenders and traditional text proportions. Terminals and serifs resolve into firm, squared shapes with subtle bracketing, creating a crisp rhythm without sharp hairlines. Overall spacing reads controlled and even, and the numerals and capitals carry a strong, steady presence suitable for structured typography.
It suits book interiors, long-form editorial layouts, and other text-forward settings where a classic slab-serif texture is desired. The compact build also works well for headlines and subheads when space is limited, and it can lend a traditional, reliable feel to packaging, signage, and institutional or academic materials.
The tone is classic and bookish, evoking traditional printing and editorial typography. Its solid slabs and compact proportions give it a serious, dependable voice that can feel authoritative without becoming ornate. The overall impression is formal and restrained, with a hint of old-style warmth.
The design appears intended to deliver a traditional slab-serif voice with compact proportions and sturdy details for practical typesetting. Its emphasis on firm serifs, controlled contrast, and consistent rhythm suggests a focus on readability and dependable tone across both display and text sizes.
The lowercase shows distinctly traditional detailing—noticeable bracket transitions and occasional small notches where strokes meet serifs—adding texture at text sizes. Capitals are assertive and clear, and the numerals appear robust and straightforward, supporting a utilitarian, text-forward character.