The three spacing controls that quietly decide whether type is comfortable to read
Designers Academy
5 August 2026 · 3 min read
In brief
In typography, kerning adjusts space between two letters, tracking modifies overall spacing in a word or line, and leading controls vertical space between lines.
Kerning, tracking, and leading are typography's three main spacing controls. Kerning adjusts the space between two specific letters. Tracking changes the overall spacing uniformly across a word or line. Leading, which rhymes with "sledding," sets the vertical space between lines of text. All three manage space, so they're easy to mix up. But each tackles a distinct problem, and fixing one won't solve the others.
Good spacing goes unnoticed by readers. But bad spacing is immediately apparent. The eye depends on consistent gaps to easily divide text into words and lines. One awkward gap between letters, or a single cramped line, can break this flow. This forces a tiny, unconscious re-read. That's why poor spacing makes things feel "off" long before you pinpoint the issue.
Kerning problems typically live in large display type, where letter pairs like "AV" or "To" can visually gap or collide unless manually adjusted, since automatic kerning tables aren't tuned for every size. Tracking is used deliberately in interface design: slightly increased tracking on all-caps labels and button text improves their legibility, since capital letters set at normal tracking can feel cramped. Leading is the workhorse of body copy legibility, with roughly 1.4 to 1.6 times the font size being the common comfortable range for reading.
Each of these is a spacing problem with a specific fix, wider tracking, manual kerning, more generous leading, but they're often misdiagnosed as "the font looks wrong" when the font itself was never actually the issue.
Increase tracking slightly on all-caps and small text, since capitals and small sizes both read more comfortably with a bit more room. Manually check and adjust kerning on anything set large enough that individual letter pairs are clearly visible, like display headlines and logotypes. Set leading generously for body copy, and tighten it deliberately, never by default, for large display text where lines sit close enough that extra space would look like a mistake.
Spacing is one of the most common places where a design that "looks fine" at a glance turns out to be quietly harder to read than it should be, because none of these issues are dramatic enough to name individually. The cumulative effect, though, is real reading fatigue, especially at length. A fast test: read three paragraphs at actual size and normal reading distance. If your eyes feel like they're working, spacing is the first place to check before touching the typeface itself.
Key takeaways
