I voted for Preev now that they are already online it's an old converter they seldom go offline the only time that they went off is when the owner failed to renew it.

Although there is a question on their security because it's showing as unsecured I'm okay on it as long as my anti-virus is not blocking it, thanks to this poll I got to know other converters now I have two more options to use for price comparison.
And based on Whois Preev is up until 2025
Domain:preev.com
Registrar:Name.com, Inc.
Registered On:2011-06-12
Expires On:2025-01-01
Updated On:2021-12-31