What does 'Tu es très belle' mean?

The compliment 'Tu es très belle' means You're very beautiful. In the Word-by-Word translation, the personal pronoun 'tu' means 'you'. The verb 'es' means '[you] are'. The adverb 'très' means 'very'. And the adjective 'belle' means 'beautiful'.
tu es très belle means 'you are very beautiful' in French.