When your eyes tire after hours of writing, the typeface is not the only cause. Readability comes from the combination of typeface, line spacing, and type size. Change the typeface while the line spacing stays tight and the fatigue does not go away.
This article covers what to look at for long-form Japanese and in what order to adjust it. Highlighting and vertical display are covered separately.
Three things matter for long-form Japanese
- Typeface — serif or sans, stroke weight, how much of the em the glyph fills
- Type size — too small and your eyes strain; too large and less fits per screen, so your eyes travel more
- Line spacing — the gap between lines. Japanese mixes kanji and kana, so it reads better with more spacing than Latin text
Line spacing is the one people skip. Typeface recommendations are everywhere; line spacing is barely discussed.
Choosing by typeface alone usually fails
Search for a Japanese font recommendation and you get a list of typefaces. Try a few well-regarded ones and keep the one that feels right.
That is not wrong, but changing a typeface changes the line spacing that suits it. A typeface with large glyphs needs more spacing or the lines look crowded; a light one looks scattered if the spacing is too wide.
Why “I changed the font and I’m still tired” happens
Changing the typeface without changing the spacing can make things worse than before.
Move from a light typeface to one with larger glyphs and the characters read better — but with the spacing unchanged, the lines now appear to touch. Your eyes take longer to find the next line, and you tire.
And the cause is hard to see. “I changed the font and I’m still tired” becomes “this typeface does not suit me”, and you try another one — cycling through typefaces without ever touching the spacing.
The other issue is settings living in different places. Typeface here, size there, spacing somewhere else. Without a path from one to the others, you never think about them as a combination.
rune Studio keeps all three in the same settings
rune Studio holds the body typeface, the body type size, and the line spacing as settings.
Reading the settings out from the development build showed body typeface, body type size, and line spacing each held as its own value. Being in one place is what lets you revisit spacing when you change the typeface.
Changes take effect on screen immediately, so you can nudge a value and stop where it reads well.
The order to adjust in
- Set the type size first — comfortable at your screen distance
- Then widen the line spacing — until lines are easy to track, stopping before your eyes start skipping
- Choose the typeface last — with the other two settled, typefaces compare cleanly
Leaving the typeface until last is the point. Comparing typefaces before size and spacing are settled means not knowing what you are comparing.
Settings can be backed up and restored
Settings can be exported and restored later. I took a backup before this verification and restored it afterwards. You can make a large change, dislike it, and go back.
Different arrangements can carry different sizes
Screen arrangements can carry their own type-size override — larger for drafting, smaller for surveying a revision. I verified on the development build that adding an arrangement and giving it a type-size override is available.
Different settings for drafting and revising
A further step is changing settings by the kind of work.
While drafting, you want the line in front of you, so set the type larger and the spacing wider. Less fits on screen, and that is fine — you are not surveying anything.
While revising, invert it: smaller type, more on screen, because you want to see paragraph breaks and the run of dialogue together.
Trying to do both with one setting leaves both compromised. Because rune Studio can hold a type-size override per screen arrangement, that distinction can live in your settings rather than in your memory.
Who this suits, and who is fine without it
It suits people writing Japanese for hours a day — long novels, technical books, translation. The longer the session, the more the spacing matters.
Short pieces are fine on defaults. Thirty minutes of writing does not surface the difference.
Scope note: what was verified is that typeface, size, and spacing exist as settings, that settings can be backed up and restored, and that arrangements can carry a size override. Which typeface reads best is personal — no specific typeface is recommended here.
Summary
- Readability is the combination of typeface, type size, and line spacing
- Changing only the typeface can leave you worse off than before
- rune Studio holds all three as settings with immediate on-screen effect
- Adjust in the order: type size, then line spacing, then typeface
For a first step, widen only the line spacing and write for thirty minutes. If that alone helps, there was something to do before hunting for a typeface.
See the current product scope on the Rune Studio product page.
