Just tried (to be sure) to use
Online TrID to analyze some files and it worked as usual. It may take a while to upload the file you want to analyze from your PC to my host, depending on file size and your Internet connection speed.
Note that you don't have to supply a web page / URL, but click the [Browse...] button, select a file on your PC and then confirm (sorry if this appear obvious, just to be sure).
Bye!