The Role of Typography in Web Accessibility

April 2, 2026inaccessibility web-design2 min read

Quick summary

Typography plays an important role in making web content accessible to all users, including people with disabilities. It is important that your website text is easy to read and understand, regardless of the user's ability. In this article, we will look at some basic typography principles that can help improve the accessibility of your website.

What are key typographic principles?

Readability: The readability of text on a website is essential for all users, but it is especially critical for users with visual impairments. Proper typography can make text easier to read, understand, and comprehend.
Font size: Font size is critical factor in web accessibility. Users with visual impairments may have difficulty reading small text.
Spacing: Proper spacing between letters, words, and lines can improve readability and legibility. Users with dyslexia or other reading disabilities may benefit from increased spacing between letters and words.
Contrast: Contrast between text and background colors is essential for users with low vision or color blindness. High contrast helps improve readability and legibility, making it easier for users to distinguish between text and background elements.

1. Readability

Always try to choose a readable font family for your website. Sans-serif fonts like Arial, Helvetica, Verdana and Tahoma are often easier to read on screens than serif fonts.

The recommended line length for a paragraph of text in web design is 45 - 75 characters, including spaces.

In CSS, 1rem is roughly the width of a lowercase letter m in a font, so a paragraph that is 60rem wide can be said to be a comfortable length.

p {
  max-width: 60rem;
}

2. Font size

WCAG recommend a minimum font size of 16px for body text to ensure readability. However, depending on the context and purpose of the site, this size may vary.

It's also important to allow users to resize¹ text as needed. Avoid setting fixed font sizes in your CSS, as this can prevent users from increasing the text size using their browser settings. Instead, use relative units like em or rem to ensure that text scales appropriately when users adjust their browser settings.

body {
  font-size: 1rem; /* 16px */
}
 
h1 {
  font-size: 2.5rem; /* 40px */
}
 
p {
  font-size: 1rem; /* 16px */
}

3. Spacing

Spacing includes elements such as line height, letter spacing, and margins between elements.

Leading or line height should be wide enough to make the text easy to read, but not to break the visual connections between lines. The standard is 1.4 to 1.6 or even more for body text.

The font size can be increased or decreased (either by a media query or by the user changing the browser's font size settings). Using pixels does not ensure that the line height is proportional to the font size. Use a proportional value instead.

p {
  font-size: 1rem;
  line-height: 1.5; /* 1.5 * 16px = 24px */
}

Tracking or letter spacing helps to make text more legible. According to WCAG², adding a small space, at least 0.12 times the font size.

Word spacing can also be adjusted to improve readability. It should be at least 0.16 times the font size.

4. Contrast

Contrast is especially important when creating text on complex backgrounds, such as images, gradients, or color blocks. Low contrast can make a site inaccessible to many users.

According to WCAG guidelines³, the minimum contrast between text and background should be 4.5:1 for regular text and 3:1 for large text.

How to measure contrast?

There are many tools available to help you measure the contrast between text and background colors. Some popular tools include:

WebAIM's Contrast Checker
Contrast Ratio
Native browser tools like Chrome's Accessibility Developer Tools

Low contrast example:

body {
  background-color: #f0f0f0; /* Light gray background */
  color: #cccccc; /* Light gray text */
}

In this case, the contrast is too low at 1.1:1, making the text almost unreadable for many users.

Recommendations for improving contrast:

Use dark text on a light background or vice versa. This improves readability and makes the text more noticeable.
Avoid shades of gray that are too light or too dark — they often do not provide sufficient contrast.
Check contrast before publishing. Make sure your color schemes comply with WCAG standards.