Hi guesssilk!
There are a few ways of finding out. One way would be in the style.css
file there is Tag post-formats
that will be listed if your theme does support them. Another would be in the functions.php
file. The theme would use add_theme_support( 'post-formats', array( 'link', 'quote' ) )
and in the array
would list all the supported formats. Another way is in your post’s editor screen.
If you take a look at the provided image, you will see which ones are supported depending on your theme. Some have just an aside, and some will have more.
Hope that helps!