What is a Block Theme?

The concept of a block theme is a relatively new addition to WordPress, starting from version 5.9. Block themes represent a significant shift in the way themes are built and offer a more flexible and powerful approach to website customization.

Understanding Block Themes

A block theme is essentially a type of WordPress theme that is constructed using blocks. These blocks allow users to modify and edit various aspects of their website through the WordPress Site Editor. With block themes, you have the ability to customize and control every part of your website without the need for any coding knowledge.

Key Differences from Classic Themes

Block themes differ from classic themes in several ways. Classic themes utilize PHP files to display content, while block themes use HTML files specifically for blocks. Block themes make use of the template hierarchy just like classic themes, but instead of relying on PHP functions and template tags, blocks are used for everything.

Block themes also introduce a new way of achieving different results. While classic themes rely on PHP functions for if/else conditionals, block settings are utilized in block themes. This brings a more intuitive and flexible approach to customizing and displaying content.

Advantages of Block Themes

There are several advantages to creating block themes. Firstly, block themes contribute to improved scalability and performance. They enhance loading performance by loading styles only for the rendered blocks on a page. This means that unnecessary stylesheets are not loaded, resulting in faster loading times.

Block themes also eliminate the need to manually enqueue stylesheets for both front-end and editors. The theme.json configuration file handles all aspects of add_theme_support(), making it easier for developers to manage styles and settings.

Furthermore, block themes come with built-in accessibility features such as “Skip to content,” keyboard navigation, and landmarks. These features are automatically generated without the need for additional code, ensuring a more inclusive and user-friendly website experience.

For users, block themes provide an unparalleled level of customization. With the help of the Styles interface, users can easily customize colors and typography for both their website as a whole and individual blocks. This empowers users to create unique and visually appealing websites without having to rely on code.

Converting Classic Themes to Block Themes

For theme developers who are accustomed to creating classic themes, the transition to block themes may seem daunting at first. However, WordPress provides resources and guidelines to help developers convert their classic themes to block themes.

By following the recommended practices and utilizing the power of blocks, developers can ensure a smooth migration process while taking advantage of the enhanced capabilities offered by block themes.


In conclusion, block themes represent a significant evolution in WordPress theme development. They provide a more flexible and efficient way of building and customizing websites, offering improved scalability, performance, and accessibility.

With the ability to edit every aspect of a website without any coding knowledge, block themes empower users to create unique and visually appealing websites. Developers can also benefit from the enhanced customization options and streamlined development process offered by block themes.

As block themes continue to gain popularity, it is essential for WordPress users and developers alike to familiarize themselves with this new and exciting approach to website design and customization.

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