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Use the method that matches your theme. In a classic theme, register separate widget areas and load the appropriate sidebar from post and Page templates, or select one with is_single() and is_page(). In a block theme, edit the single-post and Page templates separately in Appearance > Editor and place different sidebar blocks in each layout.
Here, “Pages” means WordPress’s built-in Page content type, not webpages in general. The goal may be different widgets in the same column, a completely different layout, or no sidebar on one content type; each requires a slightly different implementation.
Choose the right approach first
| What you need | Best fit | Where you work |
|---|---|---|
| Different widget content, same general layout | Separate widget areas or a conditional sidebar | Classic theme PHP and Widgets screen |
| Different columns, widths, or overall markup | Custom Page template or separate post/Page templates | Classic theme template files |
| Different block layouts without PHP | Edit the single-post and Page templates | Site Editor in a block theme |
| Sidebar on posts but full-width Pages (or the reverse) | Conditional rendering or a full-width/custom template | Classic template code or Site Editor |
WordPress defines a sidebar as “any widgetized area of your theme,” so its position is not limited to the left or right of the main content. A registered area becomes a place to assign widgets; a template still has to render it. See the Sidebars chapter in the Theme Handbook.
Classic themes: create separate post and Page sidebars
Classic themes use PHP templates and the Widgets screen. This is the most flexible route when you can edit a child theme or otherwise maintain theme code.
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1. Register two widget areas
Add registrations to the child theme’s functions.php (or a functionality plugin), hooked to widgets_init:
<?php
function freedom251_register_content_sidebars() {
register_sidebar( array(
'name' => 'Post Sidebar',
'id' => 'post-sidebar',
'description' => 'Widgets shown on single blog posts.',
'before_widget' => '<section id="%1$s" class="widget %2$s">',
'after_widget' => '</section>',
'before_title' => '<h2 class="widget-title">',
'after_title' => '</h2>',
) );
register_sidebar( array(
'name' => 'Page Sidebar',
'id' => 'page-sidebar',
'description' => 'Widgets shown on built-in WordPress Pages.',
'before_widget' => '<section id="%1$s" class="widget %2$s">',
'after_widget' => '</section>',
'before_title' => '<h2 class="widget-title">',
'after_title' => '</h2>',
) );
}
add_action( 'widgets_init', 'freedom251_register_content_sidebars' );Use stable, descriptive IDs. After saving, open Appearance > Widgets and assign different widgets to Post Sidebar and Page Sidebar. Registration alone does not put either area on the front end.
2. Add named sidebar template files
Create sidebar-post.php and sidebar-page.php in the theme. Each file renders its matching area:
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<aside class="sidebar sidebar-post">
<?php dynamic_sidebar( 'post-sidebar' ); ?>
</aside>
<?php endif; ?><?php if ( is_active_sidebar( 'page-sidebar' ) ) : ?>
<aside class="sidebar sidebar-page">
<?php dynamic_sidebar( 'page-sidebar' ); ?>
</aside>
<?php endif; ?>In the single-post template (usually single.php), load the post version:
<?php get_sidebar( 'post' ); ?>In page.php, load the Page version:
<?php get_sidebar( 'page' ); ?>get_sidebar( 'post' ) looks for sidebar-post.php; the unnamed get_sidebar() convention would look for sidebar.php. Keep these changes in a child theme so a parent-theme update does not overwrite them.
Classic themes: choose the sidebar conditionally
If one shared template should decide what to display, put the decision in that template after WordPress has run the main query:
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<?php
if ( is_page() ) {
get_sidebar( 'page' );
} elseif ( is_single() ) {
get_sidebar( 'post' );
}
?>is_single() matches a single Post and can also match attachments or custom post types; it returns false for a built-in Page. is_page() matches the built-in Page post type and can be narrowed by ID, title, or slug, for example is_page( 42 ) or is_page( 'about' ). The Conditional Tags documentation explains these distinctions.
Do not make this test in early setup code such as the top level of functions.php. Conditional tags cannot inspect the queried object before the main query exists. Also be careful in areas such as a footer: another template query can change the result, so reset it with wp_reset_query() when appropriate before testing the condition.
Target only selected content
To show a special sidebar on one Page while using the normal Page sidebar elsewhere:
<?php
if ( is_page( 'pricing' ) ) {
get_sidebar( 'pricing' );
} elseif ( is_page() ) {
get_sidebar( 'page' );
} elseif ( is_single() ) {
get_sidebar( 'post' );
}
?>Register and render a pricing-sidebar area in the same way as the other areas. Put the most specific condition first.
Use a custom Page template for a different layout
When a Page needs different columns or markup—not merely different widgets—use a custom Page template. A template can define a full-width, right-sidebar, left-sidebar, or three-column arrangement. Add a file such as page-full-width.php with a template header:
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/*
* Template Name: Full Width
* Template Post Type: page
*/
get_header();
while ( have_posts() ) : the_post();
the_content();
endwhile;
get_footer();Assign it in the Page editor’s Template control, if the theme exposes that control. Otherwise WordPress follows its Page Template hierarchy, using specialized templates before page.php and broader fallbacks. First check whether the active theme already supplies a full-width or sidebar template; the exact controls are theme-specific.
Block themes: build separate sidebars in the Site Editor
Block themes replace classic widget areas and PHP template editing with blocks and Site Editor templates. Open Appearance > Editor, choose Templates, and edit the template that controls each content type:
- Open the Single Post (or similarly named single-post) template.
- Add or select a Columns block, reserving one column for the article and one for the post sidebar.
- Place the desired blocks—such as Navigation, Search, Categories, or a custom HTML block—in the sidebar column.
- Save the template, then preview a published post.
- Return to Templates, open the Page template, and create a different column and sidebar block arrangement.
- Save and preview a Page.
Template names and available controls vary by theme. The official Block themes documentation describes the Site Editor workflow, while the Learn WordPress sidebar lesson demonstrates a Columns-based sidebar in a block theme (written for WordPress 5.9+ and Twenty Twenty-Two). Treat that lesson’s labels as illustrative and follow the templates shown by your installed theme.
Quick Recap
Troubleshoot a missing or incorrect sidebar
- No widget area in Appearance > Widgets: the active classic theme may not register one. A block theme uses the Site Editor instead of classic widget areas.
- The area exists in the admin but is blank: confirm the template calls the matching
get_sidebar()file and that the file callsdynamic_sidebar()with the exact registered ID. - A condition never matches: verify that the request is a single WordPress Post or a built-in Page, and that the conditional runs after the main query.
- Widgets appear to have disappeared after a theme switch: open Appearance > Widgets and inspect Inactive Widgets. A theme change can alter the number and names of widget areas; see Manage WordPress widgets.
- A tutorial’s block-editor screen looks different: inspect the actual Single Post and Page templates in your theme; template names, patterns, and controls are theme-dependent.
Which setup should you use?
- Choose separate registered areas when editors need independent widget inventories for all posts and all Pages.
- Choose a conditional shared template when the markup is the same and only the selected sidebar changes, including one-off Page IDs or slugs.
- Choose a custom Page template when the Page’s columns, widths, or surrounding structure differ.
- Choose the Site Editor when the site uses a block theme and you want to make the distinction with blocks rather than PHP.
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