Instantly find the perfect text spacing with our free Line Height CSS Generator. This visual tool lets you use a simple slider to adjust the vertical distance (leading) between your lines of text. See your changes in real-time and copy the clean CSS code for optimal readability.
Line height (also known as leading) is the vertical distance between lines of text. For optimal readability, it’s typically recommended to use a line height between 1.5 and 2. This creates enough space to guide the reader’s eye without making the text feel disconnected. Adjust the slider below to see the effect in real time.
Line Height CSS Generator
Instantly find the ideal line spacing for your website text with our free interactive Line Height CSS Generator. Adjust the visual slider to see your typography update in real time, then copy the clean CSS code directly into your stylesheet.
How to Use the Line Height CSS Generator
- Adjust the Slider: Move the slider left or right to change the vertical space between lines of text.
- Preview Live Changes: Watch the sample text box update instantly to judge readability.
- Copy the Code: Click the Copy CSS button to get production-ready code for your project.
What is CSS Line Height?
In web design, the line-height property determines the vertical distance between baselines of adjacent lines of text. It controls what typographers traditionally call “leading.”
Proper line spacing keeps text readable. If your lines are too close together, readers lose their place when moving from one line to the next. If lines are too far apart, the paragraph breaks into separate floating pieces and feels disjointed.
CSS
/* Example of standard body line height */
p {
line-height: 1.6;
}
Why You Should Always Use Unitless Line Height
CSS lets you set line-height using pixels (px), percentages (%), ems (em), or unitless numbers (1.5).
Using unitless numbers is strongly recommended as the best practice.
When you define line height as a unitless multiplier (like 1.5), child elements scale their line height relative to their own font-size. If you use fixed units like pixels or percentages, child elements inherit the exact pixel height from the parent, which often leads to overlapped text on headings or larger text blocks.
| Unit Type | Example | How It Calculates | Recommended? |
|---|---|---|---|
| Unitless | line-height: 1.5; | Multiplies by the element’s current font size | Yes (Best Practice) |
| Pixels | line-height: 24px; | Fixed height regardless of font size changes | No (Breaks responsive text) |
| Percentage | line-height: 150%; | Inherits calculated pixel value to child elements | Use with caution |
| Ems | line-height: 1.5em; | Inherits calculated pixel value to child elements | Use with caution |
CSS Line Height Best Practices for Web Design
- Body Text: Use a line height between 1.5 and 1.6 for paragraph text. This gives reader eyes a clear path across long articles.
- Headings (H1–H6): Use a tighter line height between 1.1 and 1.3. Because heading fonts are larger, standard line spacing makes them look detached.
- Mobile Devices: Mobile screens have narrower reading areas. Keep line heights around 1.4 to 1.5 on smaller displays to preserve vertical screen space.
- Line Length (Measure): If your paragraph width is wide (over 80 characters per line), increase line height slightly (to
1.6or1.7) to help readers find the start of the next line easily.
Frequently Asked Questions (FAQ)
1. What is the ideal CSS line-height for body text?
For standard body text on websites, a unitless line-height between 1.5 and 1.6 is recommended. This provides optimal spacing for user legibility across desktop and mobile screens.
2. Why should I use unitless numbers for line-height instead of pixels?
Unitless values (such as 1.5) allow child elements to multiply the spacing based on their own font-size. Fixed values like 24px force child elements to inherit the static pixel size, which causes larger heading text inside that container to overlap.
3. What do WCAG accessibility guidelines recommend for line spacing?
According to WCAG 2.1 Success Criterion 1.4.12, line spacing within paragraphs should be at least 1.5 times the font size to ensure accessibility for users with visual impairments or reading difficulties.
4. Why do headings require a smaller line-height than body paragraphs?
Because heading fonts are significantly larger, standard paragraph spacing (1.5 or higher) creates overly large gaps between lines of a multi-line headline. Headings typically look best with a compact line-height between 1.1 and 1.3.
5. Can I use line-height to center single lines of text vertically?
Yes. Setting the line-height equal to the fixed height of a container (e.g., a button or navigation tab) vertically centers a single line of text without using flexbox or CSS grid. However, this trick only works for single-line text.
6. What happens if I set line-height to less than 1?
Setting line-height below 1.0 (for example, 0.8) forces the lines of text closer together than the actual font height. This causes lines of text to stack directly on top of each other and overlap.
7. How does CSS line-height inheritance work?
When set on a parent element, a unitless line-height is inherited as a multiplier. Each child element calculates its own line spacing based on its individual font size. If fixed units (px, %, em) are used, the parent calculates the pixel value first and passes that static pixel height down to all children.
8. What is the difference between line-height and letter-spacing?
line-height controls the vertical space between stacked lines of text. letter-spacing (also known as tracking) controls the horizontal space between individual characters.
9. Does line-height increase the physical size of a text element?
line-height expands or shrinks the inline box height of text, which directly influences the height of block-level containers unless a fixed height property is explicitly defined on the container.
10. How do I write line-height using the CSS font shorthand property?
In the CSS font shorthand, line-height is defined after a forward slash following the font-size. For example: font: 16px/1.6 Arial, sans-serif; sets a 16px font size with a 1.6 line height.