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Romaji ⇄ Kana Converter
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Hiraganaありがとう ございます
Katakanaアリガトウ ゴザイマス
Sentence tip: the converter goes sound by sound, but Japanese spells the particles “wa,” “o,” and “e” as は, を, and へ. Adjust those yourself when writing a full sentence.
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If you're pasting romaji here, you're ready to learn the real thing. Hiragana takes most learners under a week.