Limiting allowed HTML tags in comments only I can't figure out how I can limit my text format or HTML codes for the comment sections on a node. If I edit the input formats with user roles, it edits the entire thing, including the node body and other fields.

For example, I want to have filtered text on the body field of a node, but only plain text (or other custom text format) in the comments section.

The problem I'm running into is that I have added &lt;embed&gt;, &lt;param&gt;, &lt;iframe&gt;, &lt;object&gt; into the allowed HTML tags field in my filtered text format settings, but this also allows users to post Youtube videos into the comments section, and I don't want that.

How can I do this?
You need to create two "Filtered Text" formats, one that is used by people with the access to post nodes and one for comments.

If you can't separate the two forms by access control (e.g. users are allowed to post nodes and comments, but shouldn't be allowed to post videos in comments), you could use hook_form_alter() in a custom module to limit the allowed filters for the comment form.