My Website is working on Wordpress and it is noted that response time is somewhat high. I want to reduce the page load time and improve the performace metrics by detecting the unused css in a wordpress website.

Can someone suggest the best tools to detect the unused CSS in my wordpress Website?

When you answer, please consider my following doubts

• I want to detect which CSS rules are used on specific pages
• I would like to know online or Browser based-tools (like Chrome Dev Tools..)

css  unused tools