Sirius Pro

Simply Remove Special Characters from WordPress attachments, slugs and permalinks. This plugin allows you to remove all special characters from WordPress attachments without modifying the code and it works with most of the available themes. Just install and activate this plugin to remove special characters from post and pages in WordPress.
Read more about this plugin on <a href="https://siriuspro.pl" rel="nofollow ugc">WordPress</a> blog.

Special Characters Remove

Simply Remove Special Characters from WordPress attachments, slugs and permalinks.

OptArt

The plugin allows you to enter national characters (special characters) in username during registration.
Based on the WP core function. WordPress does not allow to use national characters in usernames by default. This plugin fixes this issue.

National Characters

Allows you to enter national characters (special characters) in username during registration.

Special Characters Remove vs National Characters