Useful Nostr Tool: w3.do, Link shortener, it uses nostr relays. It works, I use it all the time.

Build by a awesome dev nostr:nprofile1qqswlsm7jlayltt8neryk7npssqfklx8vpdvavx97445vnftnp4xpuqpr9mhxue69uhhyetvv9ujumn0wdmksetjv5hxxmmd9uzax4ze