Here are some beautiful birthday wishes in Hindi that you can use to convey your feelings:

1. "आपको जन्मदिन की ढेर सारी शुभकामनाएँ!"
   (Aapko janmdin ki dher saari shubhkaamnaayein!)
   Translation: Wishing you a very happy birthday!

2. "आपकी ज़िंदगी खुशियों से भरी हो!"
   (Aapki zindagi khushiyon se bhari ho!)
   Translation: May your life be filled with happiness!