Which ones do you use? I prefer URLvoid and VirusTotal, and I've got a handful of other analysis sites which can do some sandboxing... but I'd like to hear which proven URL checking tools you use.
A lot of suggestions:
What they should do: https://www.makeuseof.com/tag/4-quick-sites-that-let-you-check-if-links-are-safe/
Whether they are all safe, is another matter all together.
This is an excellent list. Thank you much!