

"Type" column in the Posts screen.
This plugin adds a simple post-type drop-down to the post editor interface, allowing you to reassign any post to a new post type. It allows you to switch a post’s type while editing your post.
The plugin can convert nearly every combination of posts, pages, and even custom post types:
As of 3.0.0, support for switching to or from Attachments was removed. This may come back in a subsequent version.
Invisible post types, such as revisions, menus, etc., are purposely excluded. But, if you need to access invisible post types, you can adjust the boundaries using the ‘pts_post_type_filter’ filter.
With bulk editing (thanks to Matthew Gerring) you can select all the posts in a certain type and convert them to a new type with one quick action.
With Block Editor support (thanks to Daniel Bachhuber) you can switch between post types that use either the Block Editor or Classic Editor without losing any of your embedded content.