Quite some time ago I've posted about the tool, back then it only supported linking to communities, now it supports users and posts as well.
So what is this?
This is a service that's great for linking to Lemmy posts/users/communities in an instance-agnostic way.
What's the problem?
When you link to a community (user, post) using its URL, the users are taken to your instance instead of their own.
With this tool, you can wrap them in a lemmyverse.link link that offers them to set their home instance (or ignore it and go straight to the user/community/post).
Note that some of those problems have a solution when you're linking to content in Lemmy, for example the community can be linked like this: [email protected] and almost all clients support it. The 2nd link can be handled like this: @[email protected] - this format is notably not supported by the default Lemmy UI. To my knowledge, the 3rd link currently doesn't have any widespread equivalent solution (though some apps may support handling such cases). But without a tool like this one, you can't comfortably link to Lemmy content from outside of Lemmy (like in an article, blog post etc.)
On the homepage you will find a generator where you can simply paste the URL and it will generate a link for you.
You can also set 3rd party frontends as your target instance, for example a.lemmings.world for Alexandrite hosted on Lemmings.world or photon.lemmy.world hosted on Lemmy.world.