Mojien is an online Japanese dictionary and learning platform for people looking up words, kanji, and names or building their Japanese skills. Its search accepts Japanese, English, and romaji, with tags that help narrow results by level, word type, usage, kanji grade, and name category. The platform also provides instant conversions for numbers, Japanese-era dates, and currency.

Learners can use Mojien’s conjugator to check verb and adjective forms or find the dictionary form of a conjugated word. A furigana generator adds reading annotations to Japanese text and can export them as HTML ruby tags. For study and practice, Mojien offers flashcard decks, writing practice, and grammar lessons, alongside browsing tools for vocabulary, kanji, radicals, kana, and names. Users can explore existing decks and study materials, while an upgrade option and shop tools are also available. With dictionary lookups and learning resources brought together, Mojien supports Japanese study from quick reference through ongoing practice.