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Exclude a category in the query that builds the page, not with CSS. Use pre_get_posts to change WordPress’s existing home, archive, or feed query, or use a separate WP_Query with category__not_in when a template owns its own post loop. The value is an array of numeric category IDs.
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A category disappears from a WordPress page only when the query stops selecting posts in that category. Hiding cards with CSS leaves the posts in the query, can create empty spaces, and does not reliably fix pagination or feeds. The durable solution is to change the query arguments before WordPress retrieves posts.
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First determine whether the page uses WordPress’s main query or a second loop created by a template. That decision determines the correct implementation.
| Situation | Use | Important detail |
|---|---|---|
| The normal blog, home, archive, or feed loop must omit a category | pre_get_posts |
Limit the callback to the intended front-end main query. |
| A page template creates its own list of posts | A separate WP_Query using category__not_in |
Keep pagination and loop handling in that custom query. |
You are considering replacing the main loop with query_posts() |
Do not use it for this task | Modify the existing query with pre_get_posts instead. |
The same exclusion argument can be used in both approaches. The difference is which query object receives it and who controls the loop.
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Find the category ID
category__not_in accepts category IDs, not category names or slugs. A slug such as reviews will not work in this argument.
Find it in the WordPress admin
- Open Posts > Categories in the dashboard.
- Hover over the category, or open it for editing.
- Look at the browser address. The number following
tag_ID=is the category’s term ID. - Use that number in the PHP array, without quotation marks.
For example, if the edit screen contains tag_ID=12, the exclusion value is array( 12 ). If you need several categories, list each numeric ID: array( 12, 18, 25 ).
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When the ID should not be hard-coded, WordPress term APIs can retrieve it from a known slug or name. Resolve the term before building the query, verify that the result is a valid term, and then pass its integer ID to category__not_in. The query argument itself still receives IDs.
Exclude a category from the existing blog or home query
Use pre_get_posts when WordPress has already created the query that will render the page. The hook runs after the query object is created but before the query executes, so changing its parameters here affects the posts selected for that request.
Basic front-end home/blog example
<?php
add_action( 'pre_get_posts', 'exclude_category_from_page' );
function exclude_category_from_page( $query ) {
if ( is_admin() || ! $query->is_main_query() ) {
return;
}
// Exclude category ID 12 from the blog/home query.
if ( $query->is_home() ) {
$query->set( 'category__not_in', array( 12 ) );
}
}Replace 12 with the category ID you found. The early return prevents dashboard requests from being changed and prevents secondary loops—such as a sidebar or widget query—from inheriting the rule. The is_home() check targets the blog posts index; it does not mean every request that happens to display posts.
Exclude several categories
<?php
add_action( 'pre_get_posts', 'exclude_selected_categories' );
function exclude_selected_categories( $query ) {
if ( is_admin() || ! $query->is_main_query() ) {
return;
}
if ( $query->is_home() ) {
$query->set( 'category__not_in', array( 12, 18, 25 ) );
}
}Each number is excluded from the same query. Posts assigned to any one of those categories are omitted from the result.
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Target the correct request
Change the condition when the reader’s page is not the blog index. An archive, feed, or custom page can use a different conditional check on the passed $query object. The essential pattern remains the same: return for admin and non-main queries, identify the exact request, then call $query->set().
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Do not assume that the site’s front page and its posts page are the same request. Check how the site is configured and choose the conditional that represents the page you intend to filter. If the requirement includes an archive or feed, give that request its own explicit condition so the exclusion is predictable.
Where to put the pre_get_posts callback
The callback must load before WordPress runs the target query. A small site-specific plugin is a durable location because it remains active when the theme changes. The active theme or child theme’s PHP code can also contain the hook when the behavior belongs to that theme.
Site plugin
- Create a PHP file in the site’s plugins directory with a plugin header.
- Place the
add_action()call and callback in that file. - Activate the plugin in Plugins before testing the page.
Keep the callback narrowly named and avoid declaring it twice. A duplicate function declaration can produce a fatal error, while a duplicate hook can make debugging confusing.
Child-theme code
If the exclusion is part of the theme’s presentation, add the callback to the active child theme’s PHP file. A child theme avoids losing the change when the parent theme is updated. Whichever location you choose, use the PHP syntax exactly and make sure the file is loaded on front-end requests.
Build a separate page loop with WP_Query
A custom query is appropriate when a page template deliberately renders its own list of posts rather than relying on the main loop. Pass category__not_in in the arguments and use the returned query object for the loop.
<?php
$posts = new WP_Query(
array(
'post_type' => 'post',
'category__not_in' => array( 12 ),
'paged' => get_query_var( 'paged' ) ? get_query_var( 'paged' ) : 1,
)
);
if ( $posts->have_posts() ) {
while ( $posts->have_posts() ) {
$posts->the_post();
// Render the post here.
}
// Output pagination for this custom query here.
}
wp_reset_postdata();The paged argument carries the current page number into the custom query. Without it, a visitor can reach the first page but pagination may repeatedly request the wrong result set. Use the custom query’s own pagination values when generating links, and call wp_reset_postdata() after the loop so later template code sees the original global post.
Custom page conditions and templates
A page can contain a custom loop even when the site’s main query is a normal page query. In that case, changing pre_get_posts may affect the page request but not the separate list the template creates. Put the exclusion directly in the WP_Query arguments that produce that list.
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Keep the scope explicit
Set post_type and other arguments deliberately so the custom loop returns the content your template expects. The category exclusion applies to the query you construct; it does not automatically alter unrelated loops elsewhere on the page.
Use the negative cat syntax when a query already uses cat
WordPress also documents excluding categories by prefixing their IDs with a minus sign in the cat argument:
<?php
$args = array(
'cat' => '-12,-18',
);
$posts = new WP_Query( $args );Here, category IDs 12 and 18 are excluded. This form is useful when the query already expresses its category selection through cat. For code whose purpose is specifically to exclude categories, category__not_in is usually clearer because the intent is visible in the argument name and the values are an array.
Test the exclusion without breaking navigation
Test the request that readers will actually use, not only a single page while logged in as an administrator.
- Open the target page in a private window or while logged out.
- Confirm that posts assigned to the excluded category do not appear.
- Confirm that posts in allowed categories still appear in the expected order.
- Open the next and previous result pages and check that excluded posts do not reappear.
- If the requirement includes an archive or feed, test that URL separately; a home-page condition does not automatically cover it.
- Check a page with a sidebar, widget, or secondary post list to ensure those queries were not unintentionally changed.
When testing a custom loop, inspect the pagination links generated for that loop. They should preserve the custom query’s page number and continue to omit the selected category.
Common failures and precise fixes
The code uses a slug instead of an ID
Symptom: the category still appears, or the query returns an unexpected set of posts.
Fix: replace the slug or name with the numeric term ID. The argument is array( 12 ), not array( 'reviews' ).
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The callback changes too many lists
Symptom: a widget, sidebar, or another loop loses posts that should remain visible.
Fix: keep both guards: return when is_admin() is true, and return when $query->is_main_query() is false. Then add the narrowest page condition needed for the target request.
The intended page is unaffected
Symptom: the home page changes, but an archive, feed, or custom page still shows the category.
Fix: the conditional probably describes the wrong request. Replace is_home() with the appropriate check on the passed query object, or move the exclusion into the template’s separate WP_Query.
The PHP never runs
Symptom: no page changes, even though the code appears correct.
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Pagination loses the exclusion
Symptom: page one is filtered, but later pages repeat posts or show excluded posts.
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Fix: use a custom query’s paged argument and generate pagination from that query. For the main loop, modify the existing query with pre_get_posts rather than constructing a second, competing loop.
The developer used query_posts()
Symptom: pagination, globals, or other template behavior becomes unreliable.
Fix: remove the query_posts() replacement. Use pre_get_posts to adjust the main query, or create a dedicated WP_Query for an independent list. WordPress documents those approaches as better options for this purpose.
Decide whether the category should be excluded everywhere
An exclusion can be intentionally narrow. Filtering only the blog index leaves the category available on its own archive and in feeds. Filtering an archive or feed requires an explicit condition for that request. Before coding, write down the exact destinations that should omit the category:
- the posts page or home query;
- one or more category or date archives;
- feeds;
- a page template’s custom list; or
- several of these, each with a separate condition.
This list prevents an apparently successful fix from silently changing a destination that editors still need. It also tells you whether one guarded main-query callback is sufficient or whether a custom loop needs its own arguments.
Recommended implementation checklist
- Identify the exact page, archive, or feed request to change.
- Record the category’s numeric term ID.
- Choose
pre_get_postsfor the existing main query orWP_Queryfor a separate loop. - For
pre_get_posts, return early for admin requests and non-main queries. - Set
category__not_into an array of IDs. - Use
pagedand query-specific pagination for a custom loop. - Place the code in a loaded site plugin or the active/child theme.
- Test the target page, additional pages, and any archives or feeds that are meant to change.
- Do not replace the main query with
query_posts().
Why query-level exclusion is the right layer
The category rule belongs where WordPress selects posts. A query-level exclusion keeps result counts, pagination, and rendered markup aligned because unwanted posts are never handed to the loop. It also lets you choose scope: one main request can be filtered without altering every secondary query, while a custom template can apply a different rule to its own list.
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That separation is the key to maintaining a site with multiple post lists. The argument expresses what content belongs in a particular result set; the conditional checks determine which request receives the rule; and the loop remains responsible for rendering and pagination.
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