[imgopaal]

I went with PBKDF2 mostly because of its wide support and compliance history, but I’d love to hear your take on what you’d recommend.

[pabs3]

PBKDF2 is pretty obsolete crypto, argon2i I think is the latest for converting passphrases to keys. For generating keys, just use entropy instead.

[Retr0id]

If your input is a key and not a passphrase, you can just use a regular KDF. PBKDF2 is a waste of clock cycles.

Also, your site still says "E2EE" on the homepage, you should remove that.