Pragmatic Bear

LinkSentinel keeps your site healthy by scanning internal links in your posts and pages. It detects redirects and broken destinations without following all hops blindly, letting you focus on what matters:
<ul>
<li>Auto-fixes links that are permanently redirected (HTTP 301/308) while leaving temporary redirects and broken links for review.</li>
<li>Runs scheduled scans (daily/twice daily/weekly) with timezone-aware cron control and live progress feedback.</li>
<li>Provides a full dashboard under Tools → LinkSentinel for resolved links, pending redirects, broken links, CSV export and settings.</li>
<li>Customizable Resolve All batching with cooldown controls keeps bulk fixes stable even on rate-limited hosts.</li>
</ul>

LinkSentinel – Internal Link and Broken Link Scanner

Scan internal links for redirects and broken destinations. Auto-fix 301/308 permanent redirects and queue the rest for review.

Samuel Aguilera

There are three possible scenarios where this plugin does something. In all cases, the attachment page must exists, the plugin will not run for deleted attachments:
A) A visitor lands on an attachment page and the parent post is available (not in trash or deleted). A 301 redirect will be issued to redirect the visitor to the parent post.
B) A visitor lands on an attachment page and the parent post was already deleted from trash. A 302 redirect is issued to home page (this can be changed to 301 if you want, see FAQ for more details).
C) A visitor lands on an attachment page and the parent post is in trash, therefore not available for the visitor. It returns a 404 error code to prevent endless redirection loop in old WP releases and redirecting to trashed/not available posts.
There is no options page, simply activate it and will do the job.
If you’re happy with the plugin <a href="https://wordpress.org/support/plugin/attachment-pages-redirect/reviews/?filter=5" rel="ugc">please don’t forget to give it a good rating</a>, it will motivate me to keep sharing and improving this plugin (and others).
<h4>Requirements</h4>
<ul>
<li>WordPress 4.8 or higher.</li>
</ul>

Attachment Pages Redirect

Redirect attachment pages or return a 404 error for them based on the parent post status.

LinkSentinel – Internal Link and Broken Link Scanner vs Attachment Pages Redirect