How Line Height Affects Website Readability

Typography is the first thing visitors feel on a website. Even with strong content, cramped or loose text creates friction. For a site that truly communicates, line height is a major design lever—and many editors and builders set a default that may not work for every page.

Line height, sometimes called leading, affects how easy it is to read a paragraph, a headline, or a button label. When done right, readers can scan content effortlessly and move to the next line without losing their place.

What Is Line Height and Why Does It Matter?

In web design, line height describes the vertical space between lines of text. CSS line-height sets the distance from one baseline to the next, and it includes both the font size and the extra spacing around characters.

Line height matters because it controls visual density. Text set at 16 pixels with line-height 1.2 looks different from text set at the same size with line-height 1.7. Without enough spacing, readers can feel overwhelmed by long blocks of copy.

How Line Height Affects Website Readability

Text Density and Eye Movement

Many website visits are scans, not full reads. When line height is compact, lines of text appear close together. This forces the eye to work harder to avoid jumping to the wrong line.

• Tight line spacing leads to faster eye fatigue during long reading sessions.
• Optimal spacing allows smooth, left-to-right scanning without losing the current line.
• Too much spacing can make paragraphs feel fragmented and harder to follow.

Readability on Mobile Screens

On smaller screens, a comfortable line height is even more important. Mobile readers often hold devices at an angle, and they may not resize the page. A line-height value based on the font size helps keep paragraphs comfortable across different viewport sizes.

Recommended Line Heights for Web Text

No single line-height value fits every page. The ideal number depends on font, text size, and context. These suggested ranges provide a practical starting point:

Unitless vs Pixel vs Percentage Line Height

The line-height property can be written in different ways. Each method affects how text inherits and scales.

• Unitless values are relative. A line-height of 1.5 is 1.5 times the element font size, so it scales smoothly.
• Pixel values create a fixed size. They can cause issues if the user changes font size because the line spacing stays the same.
• Percentage values calculate line height from the element's font-size, so a line-height of 200% makes each line twice as high as the text.

Using unitless line-height values is the most reliable method for body text because they scale with the font size. Pixel values can be useful for precise component designs, but they can create readability issues if a user enlarges text. Percentage values are acceptable, but they can be less predictable across different layouts. For most web content, a unitless value between 1.5 and 1.8 gives the best balance between density and whitespace.

How to Choose the Right Line Height

Choose line height based on the font family, font size, and the length of the reading line. Longer lines usually need more generous line spacing, while short lines can handle tighter spacing.

Consider the Font Family

Some fonts have larger x-heights or more open letterforms, which changes how line spacing feels. Fonts like Arial or Helvetica often look good with a line height around 1.5. Serif fonts like Georgia may require slightly more space to retain an elegant feel. When you switch fonts, you may need to adjust line height to keep readability consistent.

Adjust for Text Length

Paragraphs that span more than 75 characters are more difficult to follow. For long passages, pair a narrower column with a line height of 1.6 or more. Short blurbs, quotes, and captions look fine with tighter settings.

Line Height and Accessibility

Accessibility guidelines treat line height as a visual requirement. The Web Content Accessibility Guidelines (WCAG) suggest that users be allowed to set text spacing to at least 1.5 times the default line height. That means your baseline should not be too tight, or users who need custom spacing may struggle.

If you can blur your eyes and still feel relaxed while scanning a paragraph, you have probably selected the right line height.

People with cognitive disabilities often find text easier to track when lines have clear separation. Readers with visual impairments may use custom stylesheets to widen line spacing. A flexible unitless line height makes your site more accommodating.

Line Height in Website Builders and Rovet

When you create a website with Rovet, you can control line height through the design settings or using custom CSS. In the block editor, select a text element, then look for the typography settings. Many page builders include a line-height control that ranges from 1 to 2 in increments.

If you are using a pre-built template in Rovet, the default line heights are usually fine. However, when you change the font pairing or paste large paragraphs from another source, check the rendered text carefully.

Common Line-Height Mistakes to Avoid

• Setting line-height to a fixed pixel value without considering font size.
• Using the same line-height for large headings and body copy.
• Ignoring mobile line-height until after launch.
• Combining line-height with excessive margin spacing, which can break the visual rhythm.
• Copying arbitrary values like '120%' without testing them in your own context.

Final Tips for Better Web Typography

Think of line height as a rhythm-setting tool. Use consistent values across similar text elements. For example, keep all body paragraphs at the same line-height and use paired sizes for subheadings. Share your line-height values with your team so every page feels cohesive.

Revisit your typography after you change themes, fonts, or layout widths. A line-height that worked for a narrow sidebar may not suit a wide content column. Testing outside the editor—using the actual final site—will always be the best metric for success.