This exposes the hidden structure.
These tools expose the structure behind something that usually gets judged by eye: line length, hierarchy, wrapping, spacing or fit.
Type, Layout & Effects
Find a safer line height.
Preview body copy at a chosen font size and line-height multiplier.
Type metrics
Preview
46.4px line box
The quick brown fox jumps over the lazy dog. 0123456789 The quick brown fox jumps over the lazy dog. 0123456789
This uses the browser’s rendered font family. If the font is not installed, the browser falls back.
Useful to know
Four things worth knowing.
Neat maths can still look wrong.
The mathematically neat answer can still look wrong. Typography and layout have an optical component that a counter cannot see.
Check it where people see it.
Judge it at the size it will actually be used. Typography and spacing are partly optical.
Optical judgement still matters.
Judge the result at its final size. A headline that works in a desktop editor can fall apart on a phone or projected slide.