The size must be easy to tap

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. Smartphone users should be able to tap the screen with their fingers easily. A minimum of 44px x 44px is recommended.

Visibility:
Button text should be easy to read and have sufficient contrast with the background.

Balance with layout:
The size should be in balance with the surrounding text and images.

Using an appropriately sized CTA button can increase click-through spain mobile database rates (tap rates) and maximize the effectiveness of your email newsletter.

What is the best font size for an email newsletter?


The optimal font size for email newsletters is recommended to be 15px or larger.

In order to encourage people to read and take action on your email newsletter, it is essential to have an appropriate font size that is easy to see. 15px is a size that is easy to read even on the small screen of a smartphone, so there is no problem.

However, if you set the font size of the body text to 15px or more, the headings should be larger than that. For the parts you want to emphasize, make them 24px or more to create a sharper design and improve user visibility.

Also, when considering display on smartphones, the number of characters per line is also an important factor. Generally, about 20 characters per line is considered easy to read on a smartphone .