How to Use
Input any Japanese sentence which you want to get furigana for (in hiragana or romaji). Optionally, you can also split the sentence into words/chunks and see their grammatical information (e.g. noun/verb) by ticking the checkbox(es). Regarding the dictionary option, “Dictionary 1” usually splits sentences into larger chunks than “Dictionary 2” (e.g. “東京都” vs “東京+都”; note that there is no gold standard way of splitting sentences into words in Japanese). Dictionary 1 is also better at recognising new words (e.g. slang, proper nouns). Since the sentence is processed automatically, the result may contain some errors (especially when a word has multiple readings), but overall it should be very accurate.