URL: /rules/mobile/font-size

---
title: "Font Size"
description: "Checks for readable font sizes on mobile"
---

Checks for readable font sizes on mobile

| | |
|---|---|
| **Rule ID** | `mobile/font-size` |
| **Category** | [Mobile](/rules/mobile) |
| **Scope** | Per-page |
| **Severity** | warning |
| **Weight** | 4/10 |

## Solution

Body text should be at least 16px for readability without zooming. Smaller fonts strain eyes on mobile. Use relative units (rem, em) for scalability. Test on actual devices. Google's mobile-friendly test flags font sizes under 12px. Line height should be at least 1.5 for readability.

## Enable / Disable

### Disable this rule

```toml squirrel.toml
[rules]
disable = ["mobile/font-size"]
```

### Disable all Mobile rules

```toml squirrel.toml
[rules]
disable = ["mobile/*"]
```

### Enable only this rule

```toml squirrel.toml
[rules]
enable = ["mobile/font-size"]
disable = ["*"]
```