Romaji→Hiragana
ex)toukyou→とうきょう

Romaji→Hiragana
ex)batsuge-mu→ばつげーむ

Hiragana(Katakana)→Romaji
ex)げーむ ゲーム→ge-mu geemu

Romaji→Katakana
ex)toukyou→トウキョウ





How to use: Paste Hiragana,Romaji,Katakana in the upper text box, and Hiragana,Romaji,Katakana with tone will be displayed in the lower text box.
There is also a translation page.
There is also an app version