The baseline is the invisible line on which most letters in a text rest. It serves as the reference for every other measurement in a font, from the x-height to the length of the descenders.
Where to see it
The baseline can be spotted beneath letters such as “a”, “n”, “x” or the capitals “H” and “E”, which sit flat on it. The descenders of “g”, “p” and “y” drop below it, while round letters such as “o” overshoot it very slightly so they appear properly aligned.
Why this detail matters
The baseline plays a central role in the harmony and readability of a text:
- It gives the text its stability: the eye follows this continuous line to move from word to word effortlessly;
- Round or pointed letters are drawn to overshoot it slightly, because a curve sitting exactly on the line would look smaller than its neighbors;
- Aligning several fonts or sizes on the same baseline is essential for a clean layout, particularly in headlines and interfaces.
Related term
The descender is the part of a letter that drops below the baseline, as on “g”, “p” or “y”.
Anatomy glossary
Ascender, Descender, Sidebearing, Joint, Axis, Bar, Beak, Bowl, Loop, Set width, Counter, Serif, Stem, Leg, Minim, Baseline, Eye, Belly, Foot, Point, Tail, Cross stroke, Terminal; X-height, X-height, Cap height, Body; Mean line, Ear, Spur, Ball terminal, Ligature, Apex, Vertex, Arm, Shoulder, Spine, Em dash, Thick stroke, Hairline, Bracket, Bounding box