📖 Kanji to Furigana Converter

Convert kanji text into furigana (HTML ruby), hiragana, katakana, or romaji instantly using a built-in 50 KB reading dictionary covering common compounds, major names, and joyo kanji. A token table shows the reading of each word.

100% Free No signup Browser-only Opt-in only 5 languages Dark mode

Browser-only by default. The "high-accuracy mode" checkbox enables MeCab server-side processing (no logs; works for hira/kata/romaji modes).

⚠️ About Accuracy

A built-in lightweight dictionary (about 100 KB) is used. It runs instantly but rare proper nouns and uncommon kanji may appear as unknown (?). Always verify by hand for critical use.

🔒 About Privacy

・All conversion runs entirely in your browser
・Input text and names are never sent to any server
・No storage logs, no upload history, no database

Input text

🎯 High-accuracy mode (MeCab, server-side)

Uses IPA dictionary morphological analysis for more accurate readings. Effective for Hiragana / Katakana / Romaji modes.

⚠️ Checking this sends text to the server (no logs, no database).

Output mode

📖 How to Use

1

Paste text

Type or paste any Japanese text containing kanji, including names and proper nouns.
2

Pick output mode

Choose furigana ruby, hiragana, katakana, romaji (Hepburn or Kunrei), or the token table.
3

Convert and copy or download

Click Convert to see the result; then copy or download. Kanji with no reading appear as ?.

❓ FAQ

What dictionary is used?

A lightweight dictionary (about 100 KB) is bundled with the page JavaScript. It covers about 500 common compounds, 300 surnames, 200 given names, and 1,500 single kanji. There is no server call and no large dictionary download, so conversion is instant.

Are readings of rare names and places accurate?

Words in the dictionary are accurate, but rare names that are not in it are filled in from single-kanji readings, or shown as ? if unknown. Verify manually for critical use.

Hepburn vs Kunrei romaji — what is the difference?

Hepburn (used on Japanese passports) writes shi, tsu, fu — closer to English pronunciation. Kunrei writes si, tu, hu — the regular school style. This tool supports both.

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🐛 Found a bug or issue with this tool?

Free to use, no signup. Even just the steps to reproduce are helpful. Reports go directly to the operator and help us fix issues.