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The Best Font Size for User Engagement: How to Get It Right

Vlad Niculescu
Vlad Niculescu

CEO @ Flowpoint

11 February 2024

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The Best Font Size for User Engagement: How to Get It Right

The Best Font Size for User Engagement: How to Get It Right

User engagement is crucial to the success of any website, and one often-overlooked aspect is font size. It's a small detail that can greatly impact readability and user experience. In this article, we'll discuss why font size matters, the research-backed recommendations for the best font size, and how to find the right balance for your website.

Why Font Size Matters for User Engagement

In the digital age, people's attention spans are shorter than ever. A study from Microsoft revealed that the human attention span has dropped from 12 to 8 seconds in the past two decades. If your content is not easily readable, users will quickly bounce off your website in search of a more user-friendly experience.

Respecting users' time and providing content that's comfortable to read is essential for user engagement. If your font size is too small or too large, it can lead to eye strain or make it difficult for users to scan and comprehend your content.

Research-Backed Font Size Recommendations

Although there's no one-size-fits-all solution, research points to a few best practices for choosing the ideal font size.

  1. 16px as the base size: Many experts agree that 16px is the ideal base font size to use. Smashing Magazine conducted a comprehensive study and found that 16px provided the best balance of readability, legibility, and comfort. Most modern browsers have a default font size set to 16px for this reason.

  2. Consider line length: Readability also involves line length. The optimal line length for online text is between 50-75 characters per line, including spaces. If your line length is too long or short, you should adjust the font size accordingly. This will help users to maintain focus and reduce eye strain.

  3. Mobile considerations: Most web traffic today comes from mobile devices. Experts suggest using a slightly larger font size for mobile, typically between 16-20px, due to the smaller screen size and varying viewing distances.

  4. Accessibility: To ensure your content is accessible to readers with visual impairments or cognitive disabilities, maintain a minimum font size of 12px, but aim for the recommended 16px base size.

  5. Test and adjust: Continuously test and adjust font size to cater to your specific audience. Gather feedback from users and evaluate website analytics to make data-driven decisions.

How to Find the Right Font Size Balance

With these research-backed recommendations in mind, here are some practical steps to find the ideal font size mix for your website:

  1. Start with the recommended base size: Use 16px as your default font size for body copy and adjust other typography elements (e.g., headings, menus) proportionately.

  2. Use relative units: Utilize relative units like "em" or "rem" to allow users to easily scale fonts to their preference and ensure responsiveness across different devices.

  3. A/B test different font sizes: Run A/B tests to compare different font sizes and measure their impact on key performance indicators (KPIs), such as bounce rate, time on page, and conversions.

  4. Utilize analytics: Monitor your website analytics to identify areas where users are dropping off or spending less time. This data can help inform adjustments to your font size for better user engagement.

  5. Consider typography hierarchy: Establish a clear hierarchy with headings, subheadings, and body text. Use font size, weight, and style to create a structure that helps guide users and improve readability.

By combining research and analytics, you can optimize your website's font size to maximize user engagement. However, font size is just one aspect of creating an engaging user experience. Web analytics tools like Flowpoint.ai can help identify other areas to fine-tune your website— from technical improvements to content recommendations— boosting conversions and user satisfaction.


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