egorpetrov

This plugin finds youtube video ids in posts, pages and WooCommerce products and send request to youtube API that check – does this videos still available. If video became unavailable, plugin show notifications about that.

Checker youtube videos

This plugin finds youtube video ids in posts, pages and WooCommerce products and check - does this videos still available.

ktsvetkov

This plugin is designed to “fight” the broken UTF8 
characters on your WordPress powered site.
Install the UTF8 Sanitize WordPress plugin and you 
will be able to fight those ugly characters. Additionally, you can customize 
what actions you want to perform on them – either convert them to their original 
values once and for all by modifing your posts’ database, OR leave all 
your posts intact and instead convert the ugly chars each time a post is loaded 
(all these options are controlled from the WordPress admin panel).

UTF8 Sanitize

This plugin is designed to handle the broken characters that might appear on your blog posts, if their content is converted from/to UTF8 and ISO-8859- …

Checker youtube videos vs UTF8 Sanitize