Japanese Language Tools

Free tools for Japanese language learners and readers. Convert between romaji and Japanese scripts, add furigana to kanji text, convert numbers to kanji format, and more. All tools work in your browser — no signup.

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Romaji Converter
ローマ字変換
Convert hiragana / katakana to romaji
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Furigana Generator
ふりがな生成
Add furigana readings to kanji text
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Kanji Number Converter
漢数字変換
Convert numbers to kanji and back
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Measurement Converter
単位変換
Height, weight & sizes for Japanese forms

Japanese Language Tools for Learners and Residents

Whether you are learning Japanese or navigating life in Japan as a foreign resident, these tools help bridge the language gap. From converting text between writing systems to adding furigana readings to kanji-heavy documents, the language tools on JapanCalc are built for practical, everyday use.

Coming Soon — Phase 2 & 3 Tools

The language tools section is currently in development. The Romaji Converter, Furigana Generator, and Kanji Number Converter are planned for Phase 2 and Phase 3 of the JapanCalc roadmap. In the meantime, explore the available date and calendar tools and tax calculators, or return to the JapanCalc homepage to see all available tools.