Font Line Height Tester — CSS Paragraph Spacing Visualizer
Explore how different line heights impact text readability. Choose between unitless, px, or em values and generate CSS.
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Test and Understand Line Height Visually
ToolMateX's Font Line Height Tester lets you preview paragraph spacing live. Whether you're using unitless values for modern vertical rhythm or exact `px` or `em` spacing, this tool shows you how text flows at different font sizes.
Key Features
- Adjust font size and line height live
- Switch between unitless, px, or em values
- Preview with Google Fonts or your own custom font
- View and copy the CSS snippet generated automatically
- Ideal for UI designers, developers, and typographers
Line Height Units Explained
| Unit | Description |
|---|---|
unitless | Scales line height relative to font size, preferred in modern CSS for consistent rhythm. |
px | Absolute pixel-based spacing. Precise but not responsive or scalable with font size. |
em | Relative to the element's font size. Responsive and scales with layout context. |
When Should You Use This Tool?
- Fine-tuning paragraph readability
- Creating vertical rhythm in your UI layout
- Learning how line-height units work in CSS
- Generating consistent spacing rules for design systems
How to Use
- Type or paste your text into the preview area
- Choose Google Font or upload a custom font
- Set font size and line-height value
- Select your preferred unit (px, em, or unitless)
- View the live preview and copy the CSS when ready
Frequently Asked Questions (FAQs)
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