Measure and Meaning

There's a number that doesn't get talked about enough in interface work: 66.

Sixty-six characters per line is the old typographer's target for comfortable long-form reading. Not a maximum. A target.

Why it matters more than it seems

When a line gets too long, the eye loses its place on the return sweep. The reader has to work harder to stay in the text. Over thousands of lines, that extra effort adds up to fatigue, then to skimming, then to leaving.

Most websites ignore this completely. Text stretches to fill whatever container it's in, because "it looks fine on desktop."

It doesn't read fine.

The 65ch rule in practice

I try to keep body text in articles around 65 characters. On very wide screens this means the text doesn't go edge to edge. There's often quite a lot of empty space on the sides.

That space isn't wasted. It's doing work: it's protecting the reader's attention.

The same principle applies to forms, settings panels, comments, anything meant to be read carefully rather than scanned.

It's not just about reading

Constraining measure is also a signal. It says: this content is worth slowing down for. We're not optimizing for the largest possible number of words visible at once. We're optimizing for the quality of the encounter between reader and text.

In a world of infinite feeds, choosing to make something smaller and more deliberate is a quiet act of respect.