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SEO Enforcer is a small plugin that works with WordPress SEO by Yoast (it’s required), that will truncate your title tag if it’s too long, same with your meta description tag. The length they are truncated at is a setting you can configure.
There is also an option to remove H1 tags from your content. Typically your theme will show the H1 tag for your post or page title already. Having more than one H1 tag is not recommended for SEO, so this will remove any it finds in your content and replace them with an H2 tag instead.
Plugin Requirements
<ul>
<li>WordPress SEO by Yoast v1.6.1+</li>
</ul>
Note: It may work on earlier versions of those plugins but it has not been tested.

SEO Enforcer

Ensures that your title tag and meta description tag aren't too long and truncates them if they are. Requires WordPress SEO by Yoast.

VibeThemes

WordPress SEO have never been easier! Vibe SEO Pack is a powerful and easy to use WordPress SEO plugin.
Vibe SEO Pack is not just a regular WordPress SEO tool! By using this plugin you will have your own WordPress SEO adviser right next to you 24/7. You just focus on writing and the plugin will do the SEO audit for each post and give you hints on what you should change in order to achieve best SEO results.
Out of the box solution for those who are not familiar with search engine optimization techniques, just install the plugin and you are ready to go! Intermediate and advanced users can make fine tuning to their websites (nofollow and noindex tags to specific pages and links, set up custom keywords and description to each post, revisit after tag, author tag, an many more).
Author site: <a href="http://www.vibethemes.com/" title="WordPress SEO" rel="nofollow ugc">VibeThemes</a>

Vibe SEO Pack

Vibe SEO Pack is a simple powerful and easy to use SEO tool to optimize your website for search engines without having to edit a single line of code.

SEO Enforcer vs Vibe SEO Pack