So for that purpose, after a lot of trial and error, I have developed a tool below which will help you to change HTML code to HTML entities, which will then allow you to post HTML easily and effectively inside your blogger template and comment form. You can also use it to convert your Adsense code into an embeddable form which will also allow you to insert it inside posts. It converts special characters in this way,
- '<' becomes '<'
- '>' becomes '>'
- '"' (double quote) becomes '"'
- ''' (single quote) becomes '''
- '&' becomes '&'