Seebz

<p>Improve Page Permalinks.<br />
This plugin just adds <em>.html</em> to the permalink pages when needed.<br />
An option can prevent this action for specific pages.</p>
<h4>Example</h4>
<ul>
<li>yourblog.com/page<strong>.html</strong></li>
<li>yourblog.com/parent<strong>/</strong></li>
<li>yourblog.com/parent/child<strong>.html</strong></li>
</ul>
<h4>Compatibility</h4>
<p>Not tested yet with all previous 3.0 WordPress version</p>
<p>Tests OK with the following plugins</p>
<ul>
<li><a href="https://wordpress.org/extend/plugins/permalink-redirect/" rel="ugc">Permalink Redirect</a> (v2.0.4)</li>
<li><a href="https://wordpress.org/extend/plugins/cms-tree-page-view/" rel="ugc">CMS Tree Page View</a> (v0.6)</li>
</ul>


Improved Page Permalinks

Improve page permalinks by adding ".html" for final pages

Frank Bueltge

Inpsyde GmbH

<p>When you change the permalink structure then this is a problem for bookmarks of users and also for search engines to link to your posts. This plugin uses the slug of the new url and search for a ID in the database of WordPress. If it finds a post according to the slug, the Plugin will redirect to the correct post and send a header message “moved permanently 301” to change the url on the index of search engines.</p>


Change Permalink Helper

Awesome!

It checks the Permalink and redirects to the new URL, if it doesn't exist. It sends the header message "moved permanently 301"

Improved Page Permalinks vs Change Permalink Helper