Is en in french masculine or feminine?

Answer 1

The preposition en is neither, as prepositions do not have a gender.

The pronoun en can be either, depending upon what noun it stands for, e.g.

• J'en ai de très beaux (masculine) = (say) J'ai de très beaux souvenirs.
• J'en ai de très belles (feminine) = (say) J'ai de très belles photos.

(Both meaning "I've got some fine ones".)

Answer 2

The word "en" in French is neutral and does not have a gender. It is a pronoun used to replace a quantity or part of something mentioned earlier in the conversation.