Kanjiten is an online Japanese dictionary and learning resource for people exploring kanji, kana, vocabulary, and Japanese usage. Its searchable reference covers 13,108 kanji, 218,317 words, 745,377 names, and more than 204,000 example sentences. Users can look up characters by meaning, reading, romaji, stroke count, radical, or proficiency level, and can draw a character when they cannot type it. Entries include readings, vocabulary, example sentences with English translations, and stroke-order support for thousands of kanji.

The site organizes kanji by school grade, Kanken and JLPT levels, and radicals, while its word resources span topics such as idioms, proverbs, dialects, slang, and honorific language. Learning tools include kanji, kana, and vocabulary quizzes; practice and reading sheets; custom study lists; and progress tracking. Kanjiten also offers practical language utilities, including romaji-to-kana conversion, conjugation tools, text analysis, Japanese counters, and date and number converters. Its guides explain Japanese writing systems and help learners build vocabulary and understand character readings in context.