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Gif from My Hero Academia: “Happy Birthday”– https://media.tenor.com/images/f7f9a9d7a7a36f53c8b7d46b60f2e7f1/tenor.gif Gif from Anime: “Happy Birthday”– https://media.tenor.com/images/1d45fdc4d4b4e02e4f9da9ebd5637d93/tenor.gif So if you want to say happy birthday to a close Japanese friend, you can just say "tanjobi omedeto". But the full and more polite version would be "o tanjobi omedeto gozaimasu". Gif from Naruto: “Happy Birthday”– https://media.tenor.com/images/f9a1fbebea5a8b7d99a09c1e7a29f3c3/tenor.gif
Young people are more and more likely to say ハッピーバースデー happy bazde to one another, which sounds like "happy birthday" in English. Gif from Dragon Ball: “Happy Birthday”– https://media.tenor.com/images/f9e7d6ec99b8d7a0c63f35f722f3d3a3/tenor.gif
Elegance meets celebration in a Happy Birthday GIF featuring a white creme cupcake adorned with elegant sprinkles, nestled in a cyan cup with a red bow. A golden "Happy Birthday" topper crowns the treat, and a lit animated sparkler adds a touch of magic. This refined yet festive GIF is a tasteful way to convey birthday wishes with style and charm. Share the animated delight to elevate the celebration with a touch of sophistication and sparkle. Happy Birthday, a treat for the eyes and the spirit!
In Japanese, “happy birthday” is written (お) 誕生日 おめでとう (ございます). This is pronounced “(o) tanjoubi omedetou (gozaimasu)”. Gif from Sailor Moon: “Happy Birthday”– https://media.tenor.com/images/7cdc0e3d3f60b2d3f7f3d30c3d3fa076/tenor.gif Celebrate with love and color! A Birthday GIF features a heart-shaped frame crafted from a dosen of multicolored balloons, creating a joyful and animated spectacle. Happy Birthday, where the heart of happiness is framed by a burst of animated balloons, making every moment truly special!Gif from Sword Art Online: “Happy Birthday”– https://media.tenor.com/images/99f00cf4f4ca4a4b9e906d9ea57f0f1b/tenor.gif
For the record, birthdays have been celebrated in Japan since about 1950. Previously, all Japanese birthdays were celebrated over the new year!