AI English to Japanese Converter

There is no single correct Japanese version of an English sentence. The same message is written differently depending on who reads it, and choosing the wrong level stands out more than a clumsy word. This converter settles that question first, then hands your text to an AI model that reads the whole passage before writing.

The tone setting covers the three registers people actually use. Polite is the です・ます form for everyday messages, customers, and anyone you do not know well. Casual is the plain form for friends, chat, and social posts. Business keigo splits the honorific and humble forms properly, using 尊敬語 for what the reader does and 謙譲語 for what your own side does. That split is where most machine translation falls apart.

The script setting controls what you get back. Japanese returns the normal mix of kanji, hiragana, and katakana. Romaji adds a second block with the same text in Hepburn spelling, so you can read it aloud or paste it somewhere Japanese fonts are missing. Furigana puts the hiragana reading in brackets after every word containing kanji, which is what learners need to get through a sentence without a dictionary.

Punctuation follows Japanese rules: 。 and 、 instead of full stops and commas, 「 」 for quotes, and no spaces between words. Paragraphs, line breaks, and lists stay put, and names, brands, links, code, and placeholders such as {name} are untouched. Your text is processed by our AI provider, so leave confidential material out.