ShortUrl for dotnet core 3.1 is under construction.
Core code is ready. Currently, sgjsakura is busy on building the html for management, which will be more powerful and beautiful than the previous one.
Please wait for a short while.
Short url generator with no database required. Install this as a site.
Platform: ASP.Net 4.0
Source files available at https://github.com/scegg/ShortUrl/.