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Japanese reading tools / Completely free

A little help.
Above every word.

Add hiragana above Japanese kanji and suggested source words above common katakana loanwords. Read the original, with a little context on top.

Japanese annotations

漢字 → ひらがな · カタカナ → source word

On-device processing

Up to 5,000 characters. The dictionary downloads on first use (about 18 MB); text stays on your device.

Custom annotations / 修正・原文を追加

One entry per line: Japanese text=annotation. These override automatic readings and can span multiple words. For example:

明日=あした
コンピューター=computer
アルバイト=Arbeit (German)

ANNOTATED RESULT

Your annotated text will appear here.

Copy uses parentheses. Download HTML preserves the text-above-word layout.

How it works

Read the word. See its reading.

Paste Japanese text and choose Add annotations. Kanji words receive a hiragana reading above them using native ruby annotations. The original text, spaces, punctuation, and line breaks are preserved.

Common katakana loanwords receive a suggested source spelling, such as コンピューター → computer, パン → pão (Portuguese), or アルバイト → Arbeit (German). Non-English sources are labeled. This is a small built-in word list, not a complete etymological dictionary or translation service.

Unknown katakana, names, sound effects, and Japanese-made foreign expressions may have no recoverable original. Unmatched words remain unchanged and are underlined for review. Add a custom annotation to supply a spelling or fix a reading.

  1. Enter text or try the Japanese sample.
  2. Optionally add corrections, then choose Add annotations.
  3. Read the result, copy annotated text, or download an HTML file.
Good to know

A reading aid.

Are the readings always correct?

No. Context-dependent readings, names, and unusual spellings can be wrong. Furigana is placed above whole dictionary words, including kana in mixed words. Use custom annotations for corrections.

Why not restore every foreign word?

Katakana does not uniquely encode the source language or spelling. Source labels are representative suggestions, not proof of a particular borrowing history. Unsupported words are not guessed.

Does it use a paid AI service?

No. The browser downloads an open-source Japanese dictionary and processes text in a background worker. The roughly 18 MB dictionary is loaded only when you run this tool. Your browser may cache it.

What software powers this tool?

Kuromoji.js 0.1.2 and its IPADIC dictionary. See the software license and dictionary notices.