Line height and leading: give paragraphs a readable rhythm
Set line spacing in relation to the actual font, width, and size, then troubleshoot cramped or fragmented paragraphs without relying on a single universal ratio.
Look at the visible paragraph
Line spacing controls the relationship between successive lines of text. Its visible effect depends on the typeface's proportions, the size, and the line length. Two faces using the same numerical setting may produce very different bands of text and very different amounts of apparent open space.
Start with a representative paragraph containing ascenders, descenders, punctuation, and a few longer words. Use the intended width and size. A short sample made mostly of small lowercase letters can conceal collisions or crowding that appear immediately in ordinary prose.
Compare a small range
Make three versions with tight, moderate, and more open spacing while keeping everything else fixed. Read each one normally. Look for the point where the lines remain connected as a paragraph without feeling compressed. The best setting is a relationship to evaluate, not a number to memorize independently of the text.
Longer lines may require a different spacing relationship from short labels or narrow columns. If returning to the next line feels uncertain, compare a narrower measure as well as more open spacing. Changing the width can solve a problem that endless increases in line spacing only partly address.
Keep paragraphs connected
Line spacing and paragraph spacing do different jobs. The first organizes lines within a paragraph; the second separates complete units of thought. If both gaps are nearly identical, the paragraph structure may become unclear. If the paragraph gap is enormous, the prose can feel like disconnected statements.
Choose a clear method for paragraph separation and apply it consistently. Check lists, captions, and quotations separately, since their structure may require different treatment. Avoid adding manual empty lines to repair isolated areas when a reusable style can express the intended relationship more reliably.
Check the final medium
Read the text at its intended physical size or ordinary display scale. A zoomed-in canvas makes tight spacing look more generous, while a fit-to-page preview may conceal uncomfortable small type. Print a sample for a printed project and inspect the actual viewing distance.
Recheck after changing the font or column width. A line-spacing value approved for one setting does not automatically remain appropriate after a redesign. Keep a specimen with the final paragraph, headings, and captions so the system can be reviewed as a whole. Consistency should preserve readability, not protect an outdated numerical choice.
Try it yourself
- Compare spacing with the actual font, width, size, and prose.
- Distinguish line spacing from paragraph separation.
- Recheck the setting after any change to the text measure or face.
Worked example: a narrow exhibition essay
Typeset a fictional exhibition essay in a narrow column. Compare three line-spacing settings using the same font and size. If the tight version creates a dark band and the open version feels like separate strips, choose a middle range and read several paragraphs. Then widen the column and compare again. You may need a different relationship because the return path is longer. Finally set a caption using its own role requirements rather than copying the essay's settings mechanically.
References & further reading
Examples and exercises in this guide are original teaching scenarios.
