But customizing my WordPress RSS feed was a lot harder than it sounded. I have searched for adding featuring image to rss feed with no plug-in for WordPress. WP RSS Aggregator. That's when I realized the solution was to start at the source and customize my WordPress RSS feed. While researching another question, I found the Anyfeed Slideshow plugin, that shows images in RSS feeds. We refer to this as feed, which contains the summary and metadata of your content.

Now that you have a better idea of what RSS feeds are, let’s take a look at how you can share your own WordPress RSS feed with your site’s readership. By default feeds are generated for your posts but also their comments. Below are a couple of WordPress RSS feed plugins that we recommend.
If you have used the RSS feed on your WordPress blog you may have realized the featured image isn’t included in your feed.

WordPress’ RSS feed does not include a field for the URL of the featured image. I have found some examples and applied how it was instructed. WP RSS Aggregator; FEEDZY RSS Feeds Lite; Featured Images in RSS & Mailchimp Email; 1. Justified Image Grid can get your latest Pinterest content.

Still can't reach the image. WordPress sites, by default, create RSS feeds during installation. Having an RSS feed with images will improve your syndication and may come in handy later since marketing tools like Mailchimp use RSS feeds … When you have an RSS feed, or an email campaign hooked into your RSS, that Featured Image doesn't show up. These feeds can be used to turn one-time readers into regular subscribers, but they can also be used to aggregate content from other websites and post them to a site of your own.

But All I have got now is nothing. With its plugability and vast cache of plugins it's easy to create new RSS feeds or modify the ones that exist. WordPress comes with built-in default RSS feeds.You can tweak the default feeds by adding custom content to your RSS Feeds, or even adding post thumbnail to your RSS Feeds.The default RSS and Atom feeds are enough for most users, but you may wish to create a custom RSS feed for delivering specific type of content.

The last and the best (according to me) solution (as told here) I have found is adding the following code to current theme's functions.php This is great for your users and your audience.
We refer to this as feed, which contains the summary and metadata of your content.

Here's the problem. This happens because most themes add the Featured Image to posts as part of the WordPress template — that image isn't natively part of the content.