To say “Congratulations on your birthday” in Japanese, you can use the following phrase:
**お誕生日おめでとうございます (Otanjoubi omedetou gozaimasu)**
This is a common and polite way to say “Happy Birthday” in Japanese. It is a standard birthday greeting used to wish someone a happy and joyous celebration on their special day.
**Additional Forms:**
For more casual or informal situations, you can use these variations:
1. 誕生日おめでとう (Tanjoubi omedetou)
This is a shorter and less formal version of the phrase. It is commonly used among friends and family members.
2. お誕生日おめでとう (Otanjoubi omedetou)
This is another casual form of “Happy Birthday” and is often used in friendly settings.
Remember to use the appropriate level of formality and politeness based on your relationship with the person you are greeting. Using these birthday wishes will show your thoughtfulness and cultural awareness when celebrating someone’s special day in Japanese.