OzTheGreat

Improves upon the default WordPress filename sanitizer to remove all non-latin special characters and accents for all new uploads, media and attachments.

WPArtisan Filename Sanitizer

Sanitize media filenames to remove non-latin special characters and accents

Whodunit

Kantari Samy

The plugin uses the hook “wp_handle_upload_prefilter” and modifies the filename to remove all special characters.
FEATURES 
– Remove accents 
– Remove special characters 
– Change the filename to lowercase
Examples : 
– filename : rick & morty.png > rick-morty.png 
– filename : finaL fantasy / (Copié) (Copié).jpg > final-fantasy-copie-copie.jpg

WPArtisan Filename Sanitizer vs Healthy filename