Kerning

Definition

Kerning is the work of fine-tuning the gap between specific pairs of letters so that a whole line of text looks evenly spaced. Every letter has its own shape, so when you simply line them up side by side, some pairs look too far apart while others look cramped. Take A next to V, or T next to o, where slanted edges or curves face each other and leave what looks like a hole in the middle. Nudge just those pairs a little closer and the density of the whole line evens out. This is what sets kerning apart from tracking, which shifts the space between every letter by the same amount. Kerning is the careful fix that touches only the pairs that need it.

Why does it matter?

The human eye reads uneven gaps between letters as something being off. When one pair sits noticeably wider than the rest, the word seems to break for a beat right there, and your reading stumbles ever so slightly. Kerning fills in that imbalance so the letters flow together as a single, smooth word. The difference grows more obvious the larger the type gets, so it really shows in big headlines, logos, and button labels — anywhere text jumps out at you. The good news is that most fonts already ship with pair-by-pair kerning data built in, so simply leaving kerning switched on lets the browser handle it for you. Turn it off, and certain pairs drift apart awkwardly, making even a well-crafted font look a little sloppy.

Common mistakes

• Treating kerning and tracking as the same thing. Tracking is a uniform adjustment that opens or tightens the space between all letters equally, while kerning fixes only specific pairs. If a whole line feels cramped, reach for tracking; if only one pair looks off, that is a kerning problem.
• Leaving kerning off on large headlines or logos. Gap imbalances you would never notice at body size become glaringly obvious at large sizes, so the bigger and more prominent the text, the more you want kerning on to keep it clean.
• Trying to fix an awkward pair with tracking instead of kerning. Opening or tightening the overall tracking disturbs not just the one problem pair but all the perfectly fine pairs too, which can actually leave the whole line looking more uneven than before.

Practical tips

• Kerning is usually handled automatically by the font, so the default move is to leave font-kerning switched on and let it do its job. Its purpose differs from tracking, which adjusts everything uniformly, so do not mix the two values up.
• For places where letters are shown large, like big headlines or logos, give the automatic kerning a quick visual check. If a pair still looks too open, nudge just that spot slightly to balance it out — that small fix can change the whole impression.
• At small sizes like body text, there is no need to obsess over kerning. The differences are barely visible at that scale, so let the automatic handling take care of it and spend your time on the large, eye-catching text instead. Knowing where to spend your limited time is an important instinct in real work, too.

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