I have a textarea on a content type that needs to be converted ASCII character-set. Is there an available module that adds a input filter for this? This field needs to be fed to another platform with this formatting.
If you have the Transliteration module installed, you can create your own filter.
/admin/config/content/formats and click on Add text format at the top. One of the options is Convert all characters to US-ASCII. Set the roles you want to allow use of the format and save.