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.

Password Generator
パスワード生成
Generate secure passwords in your browser
Romaji Converter
ローマ字変換
Convert hiragana / katakana to romaji
Furigana Generator
ふりがな生成
Add furigana readings to kanji text
Kanji Number Converter
漢数字変換
Convert numbers to kanji and back
Measurement Converter
単位変換
Height, weight & sizes for Japanese forms
Character Counter
文字数カウンター
Count characters, lines, bytes in real time
Area Converter
坪・畳・平米変換
Convert tsubo, tatami, m² & ft² instantly

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.

Japanese Language Tools for Learners and Residents

Whether you are learning Japanese or navigating daily life in Japan as a foreign resident, these tools help bridge the language gap. Convert text between writing systems, add furigana to kanji documents, check character counts for social media, and more — all free, browser-based, no signup.