How To Fix WordPress RSS Feed Errors

RSS feeds publish content using the XML format. A single stray character before the XML declaration (an invisible space, a tab, or a byte order mark) causes the entire feed to fail. When that happens, RSS readers stop pulling new posts, and any tool that depends on your feed stops receiving updates.

How to check your feed right now:
Visit yourdomain.com/feed or yourdomain.com/feed/rss2 in your browser. A working feed displays raw XML. A broken feed shows an error message like:

XML Parsing Error: XML or text declaration not at start of entity
This page contains the following errors: error on line 1 at column 6: XML declaration allowed only at the start of the document

If you see a completely blank white page, the feed URL may exist but the server is returning an empty response.

Use Firefox for better error messages:
Firefox renders XML natively and shows the exact line number and column where the error occurs. Chrome strips the error and may show nothing useful. Open the feed URL in Firefox when you need a precise error location to track down the source.

Other symptoms that indicate a broken WordPress RSS feed:

• Feed readers report “feed not found” or return empty results
• Email plugins that use your feed (like MailPoet or FeedBlitz) stop sending updates
• Podcast directories like Apple Podcasts or Spotify reject your feed during submission
• Social sharing automations that monitor your feed stop posting
• The feed URL returns a 404 error (this is a different problem, covered at the end of this guide)

Quick validation:
After identifying the problem, use the W3C Feed Validation Service. Paste your feed URL and run the check. It will confirm whether the feed is valid and identify any remaining structural issues.

Several things can break a WordPress RSS feed, and the frustrating part is that most of them are invisible in the WordPress admin.

Extra whitespace or line breaks in PHP files:
A space or blank line before the opening <?php tag, or after the closing ?> tag, causes PHP to send that whitespace to the browser before WordPress can output the XML declaration. XML requires the declaration to be the very first content. Even a single space breaks it.

Byte order mark (BOM) in a PHP file:
Some code editors add a BOM character at the very start of files when saving in UTF-8. This invisible character appears before the XML declaration and breaks the feed. Windows Notepad is the most common culprit.

To check and remove a BOM: in Notepad++, look at the bottom right corner. If it reads “UTF-8-BOM”, go to Encoding > Convert to UTF-8 (without BOM) and save. In VS Code, click the encoding label in the status bar and select “Save with Encoding > UTF-8”. Most Mac editors (TextMate, Nova, BBEdit) show encoding in the status bar and let you switch with one click.

PHP errors outputting text:
When PHP has display_errors set to On in production, error messages print to the page before any other content. This breaks the feed if a plugin or theme generates a PHP notice or warning.

Plugin conflicts:
Plugins that modify page output (SEO plugins, social sharing plugins, analytics plugins) can interfere with feed formatting. Any plugin that hooks into wp_head or uses ob_start() incorrectly is a candidate.

Theme code errors:
A custom theme function that outputs content at document start, before WordPress sends feed headers, will corrupt the feed output.

The most common source of WordPress RSS feed errors is extra output before the XML declaration, usually whitespace in functions.php. Here is how to track it down.

Check functions.php for trailing whitespace:
Open your theme’s functions.php file via FTP or the WordPress File Editor (Appearance > Theme File Editor). Scroll to the very end. If there is anything after the closing ?> PHP tag, even a blank line, delete it. Better yet, delete the closing PHP tag entirely. PHP does not require it, and removing it eliminates the risk of trailing output entirely.

Check your plugins’ main PHP files:
Any plugin that adds output before WordPress is ready can cause this. Download your most recently installed or updated plugins via FTP, open their main .php files, and look for trailing whitespace after the closing tag.

Add output buffering as a workaround:
If the source is difficult to find, you can stop whitespace from reaching the feed by adding output buffering. Add this line to the top of your functions.php file, immediately after the opening <?php tag:

ob_start();

This captures any stray output before WordPress can send the XML headers, which prevents stray characters from corrupting the feed.

Refresh permalinks:
Sometimes a feed error follows a permalink structure change rather than a PHP file change. Go to Settings > Permalinks in WordPress admin and click Save Changes without modifying anything. This flushes the rewrite rules and often resolves feed 404 errors.

Confirm the fix worked:
After each change, check the feed URL in Firefox or paste it into the W3C Feed Validation Service. Do not assume the fix worked without verifying.

If the manual fix above didn’t solve the problem, a plugin is likely generating extra output that’s corrupting the feed. Here’s how to find it efficiently.

The naive approach is deactivating all plugins at once and then reactivating them one at a time. But if you have 20 plugins, that’s 20 tests. A faster method is binary search:

1. Deactivate half of your active plugins
2. Check the feed. If it works, the problem is in the half you just deactivated. If it’s still broken, the problem is in the other half.
3. Take the problematic half and deactivate half of those
4. Repeat until you’ve identified the single plugin causing the issue

This typically finds the culprit in 4-5 tests regardless of how many plugins you have.

Look first at plugins that modify output or content: SEO plugins, social sharing plugins, analytics plugins, and any plugin that hooks into wp_head or wp_footer. These are the most common offenders.

Once you’ve found the culprit, check whether the plugin has a settings option that’s generating the extra output. Sometimes disabling a specific plugin feature (rather than the whole plugin) is enough to fix the feed.

If disabling plugins didn’t fix the feed, your theme is the next suspect. The safest way to test this is to temporarily switch to a default WordPress theme like Twenty Twenty-Four.

Go to Appearance > Themes and activate a default theme. Then check the feed again. If the feed works with the default theme, your original theme has code that’s corrupting the feed output.

One important note: if you’re using a child theme, test the child theme and the parent theme separately. Deactivating the child theme and switching back to the parent theme alone can help you pinpoint whether the problem is in the parent theme’s functions.php or in your child theme customizations.

If the theme is confirmed as the cause:

• Contact the theme developer and report the issue. Provide the XML error message and the URL of your feed. Most quality theme developers will fix this quickly.
• Check the theme’s support forum or changelog. The fix may already be available in an update.
• If the developer is unresponsive or the theme is abandoned, it’s worth looking for a replacement. You can use our guide to installing a new WordPress theme to make the switch safely.

Sometimes your RSS feed URL returns valid XML but feed readers report stale content, show no new posts, or the feed appears to serve the wrong content type. This is different from a broken feed. The URL works, but your cache layer is serving an outdated version or blocking the correct response headers.

This happens most often after installing a new caching plugin or switching to a CDN like Cloudflare.

Clear your caching plugin’s cache first:
Most caching plugins add a “Clear All Cache” button to the WordPress admin toolbar. Clear the cache and immediately check your feed URL in a browser. If fresh posts now appear, caching was the issue.

To prevent it from recurring, exclude the feed URL from caching:

• WP Rocket: Go to Settings > WP Rocket > Cache and add /feed/ to the “Never Cache URL(s)” field.
• W3 Total Cache: Go to Page Cache > Advanced and add /feed/ to the “Never cache the following pages” list.
• LiteSpeed Cache: Go to LiteSpeed Cache > Cache > Excludes and add /feed to the URI field.
• WP Super Cache: Go to Settings > WP Super Cache > Advanced and add feed to the “Reject URI” list.

Cloudflare users:
Cloudflare caches static assets by default, and some configurations cache dynamic pages including your feed URL. Log in to your Cloudflare dashboard, go to Caching > Cache Rules, and check for any rules that might affect /feed/.

Try purging the cache for your feed URL specifically: go to Caching > Configuration > Custom Purge and enter your feed URL. If purging fixes it temporarily but the problem returns, set up a Cache Rule to bypass caching for all URLs containing /feed.

Quick test to confirm caching is the cause:
Add a unique query string to your feed URL (yourdomain.com/feed/?nocache=1) and check whether new posts appear. If the feed works with the query string but not without, caching is the issue.

A 404 error on your feed URL is a different problem from an XML parsing error. A 404 means the feed URL does not exist at all, rather than the feed being malformed. This usually has one of three causes.

Permalinks need to be flushed:
This is the most common cause. WordPress stores its URL rules in the database and in an .htaccess file. If the rewrite rules get corrupted or overwritten, feed URLs stop working. The fix is simple: go to Settings > Permalinks in your WordPress admin and click Save Changes without changing anything. This regenerates the rewrite rules.

After saving, visit your feed URL again. In most cases, the 404 will be gone.

The .htaccess file is missing or wrong:
If refreshing permalinks did not fix it, the .htaccess file in your WordPress root directory may be the problem. Connect to your site via FTP and open .htaccess. A standard WordPress .htaccess file should contain:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

If the file does not contain these lines, or if it contains conflicting rewrite rules, that is likely the source of the 404. Replace the WordPress section with the code above.

Your host has disabled mod_rewrite:
Shared hosts occasionally have mod_rewrite disabled. Without it, WordPress cannot route feed URLs to the correct handler. Check your host’s documentation or contact support to confirm mod_rewrite is enabled for your account.

A plugin is interfering with feed routing:
Some security plugins (Wordfence, iThemes Security) include firewall rules that can block feed URLs. Try temporarily deactivating your security plugin to see whether the 404 disappears. If it does, adjust the plugin’s settings to whitelist the feed URL.