If you click all the example links at the bottom, this one does not work:

https://ftfy.now.sh/?s=%23%E2%95%A8%E2%94%90%E2%95%A4%C3%87%E2%95%A8%E2%96%91%E2%95%A8%E2%96%93%E2%95%A8%E2%95%95%E2%95%A8%E2%95%97%E2%95%A4%C3%AE%E2%95%A8%E2%95%9C%E2%95%A8%E2%95%9B%E2%95%A8%E2%95%A1%E2%95%A8%E2%94%90%E2%95%A8%E2%95%95%E2%95%A4%C3%A9%E2%95%A8%E2%96%91%E2%95%A8%E2%95%9C%E2%95%A8%E2%95%95%E2%95%A8%E2%95%A1

The site seems to have no IPv6 DNS record and thus is inaccessible over IPv6-only connections.

Should it be able to fix “ÓůÓĂČíĽţ(YYRJ)” ?
(It should be a person’s name in a Chinese script.)

Pasting v¾¾r or using https://ftfy.vercel.app/?s=v%C2%BE%C2%BEr inserts Â before each ¾ and wrongly results in this:

s = 'v¾¾r'
s = s.encode('latin-1')
s = s.decode('utf-8')
print(s)

then prints v¾¾r (which it started with)

The actual solution should be this:

s = 'v¾¾r'
s = s.encode('cp850')
s = s.decode('latin-1')
print(s)

printing vóór.

Related: rspeer/python-ftfy#18 (comment)

Should it be able to fix “ąéͧľĂ WiFi ¤čĐ” ?
(It should be a person’s username in the Thai script.)

I tried running https://ftfy.vercel.app/?s=Pyrenee%C3%83%C2%ABn to see what would cause Pyreneeën

In stead of explaining Pyreneeën, it explained Pyrenee�«n

A log of the difference between these two is at https://gist.github.com/jpluimers/adff0ffe6eec6fdc7eab642ffdfd4ee5

I tried archiving the current faulty behaviour at https://web.archive.org/web/20211107130727/https://ftfy.vercel.app/?s=Pyrenee%C3%83%C2%ABn (which failed with a server error 500) and https://archive.md/to6Vt (which succeeded)