Is there a module that creates an input filter to convert text to the ASCII character-set? 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.

Go to /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.