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Choose a block theme if you want to edit site-wide layouts and styles in WordPress’s Site Editor. Choose a classic theme if its PHP-based templates and existing customization controls already suit the way you manage your site. Neither type is automatically the better choice: compare the actual theme features and test the specific theme before switching a live site.
How block and classic themes differ
The main difference is how each theme handles the parts of a site beyond individual post content. A block theme uses blocks for areas such as navigation, headers, content, and footers, and works with WordPress’s Site Editor. A classic theme follows the traditional theme structure and customization workflow.
Block themes
With an active block theme, the Site Editor provides tools for editing templates, template parts, styles, and site layout. Templates control the structure used by groups of pages or posts; template parts are reusable areas such as headers and footers. WordPress’s block themes documentation explains the theme type, and its Site Editor guide describes the available editing areas.
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Classic themes traditionally define templates in PHP files. Their customization options generally come from the theme’s own settings and established WordPress tools, such as the Customizer, menus, and widgets. A classic theme does not provide the block-theme Site Editor in the same way.
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Classic does not mean block-free. A classic theme can support block-editor styling through theme supports or theme.json, and some classic themes can enable the Template Editor. WordPress describes that distinction in its Template Editor documentation.
Compare the workflows that matter
| Decision factor | Block theme | Classic theme |
|---|---|---|
| Site-wide styles and layout | Edit site styles and layout with blocks in the Site Editor. | Use the theme’s available settings and customization workflow; it does not provide the block-theme Site Editor. |
| Templates and recurring areas | Edit templates and template parts, including headers and footers, with blocks. | Templates are traditionally PHP files; some classic themes enable block-based template editing in the post or page editor. |
| Template format | HTML files containing block markup. | PHP files containing HTML, template tags, and PHP code. |
| Best fit | Useful when you want to make broad layout and style changes in the editor. | Useful when the theme’s existing structure and customization controls support the work you need to do. |
The technical distinction between PHP templates and HTML templates with block markup is outlined in the WordPress Block Editor Handbook’s theme guide. The best fit depends on your site’s needs and the specific theme, not the category alone.
When a block theme is the better fit
Consider a block theme if you want to make changes to site-wide structure and appearance through the WordPress editor rather than relying mainly on a theme’s separate settings. The Site Editor lets you work on recurring layouts as well as styles.
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When a classic theme is the better fit
A classic theme can be the practical choice if its PHP-based structure and available customization controls already support your work. You may not need to change theme types simply to use blocks in posts: classic themes can support selected block features, and individual themes vary in what they enable.
Check the theme’s actual features rather than assuming that every classic theme has identical controls—or that every block feature is limited to block themes. WordPress’s Theme Handbook overview provides background on themes and their role in a site.
How to evaluate a theme before switching
- List the changes you need to make. Separate site-wide work, such as changing a header or page layout, from editing the content of individual posts.
- Check the specific theme’s features. Confirm which editor and customization controls it provides. Do not rely on the block or classic label alone.
- Preview it. WordPress recommends previewing a theme where available. Its theme guide explains working with themes.
- Test it away from your live site. Use a test site to evaluate the theme more thoroughly before activating it on a site visitors use.
- Review the result on representative pages. Check pages and posts that use different templates, particularly after changing a template shared across multiple pieces of content.
Compatibility and what the theme label cannot tell you
WordPress introduced block themes as a theme type with WordPress 5.9. That is historical context, not a guarantee that every current theme has the same minimum WordPress version. Check the requirements for the specific theme you intend to use.
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