---
title: "Legibility"
canonical_url: https://idratherbewriting.com/ucd-legibility/index.html
---

> For AI agents: a documentation index is available at https://idratherbewriting.com/llms.txt. Markdown versions of all pages are available by appending .md to any page URL.

# Legibility

> Follow these general guidelines for legibility:
>
> - 9-12pt font size
> - 10-12 words (55 characters) per line
> - Dark text on light background
> - 70% + contrast
> - Leading 1-4 pts more than font size