Here are some options:
Formal:
* നിങ്ങളെ സ്നേഹിക്കുന്നു (ningale snehikkunnu): This is the most formal and literal translation of "I love you." It is appropriate for someone you respect greatly or are in a formal relationship with.
Informal:
* നിന്നെ സ്നേഹിക്കുന്നു (ninne snehikkunnu): This is a more informal version of the previous phrase, used for friends, family, or someone you are closer to.
* ഞാൻ നിന്നെ സ്നേഹിക്കുന്നു (njan ninne snehikkunnu): This is another informal option that emphasizes "I" and is often used when expressing deep affection.
* പ്രിയപ്പെട്ടവൻ/പ്രിയപ്പെട്ടവൾ, ഞാൻ നിന്നെ സ്നേഹിക്കുന്നു (priyapettavan/priyapettaval, njan ninne snehikkunnu): This adds a term of endearment, like "darling" or "sweetheart," and is appropriate for romantic partners or very close friends.
It's important to consider the context and your relationship with the person you are saying this to.
For example, if you are saying "I love you" to a romantic partner, you might use a more intimate and emotional phrase. If you are saying it to a friend, you might use a more casual and friendly phrase.