The best way to Unmimiify HTML online is by b using the fixcode.org HTML UnMinifier

 

Fixcode.org also has the following minifiers

  1. CSS UnMinifier: https://fixcode.org/beautify/css
  2. javaScript UnMinifier:https://fixcode.org/beautify/js
  3. JSON UnMinifier: https://fixcode.org/beautify/json
  4. XML UnMinifier: https://fixcode.org/beautify/xml