Adaptive Furigana

About

Adaptive Furigana helps you read Japanese on any website — for free — and grows with you as you learn.

▍ Free
Furigana on any site: Readings appear above the kanji on the page so you can read anything.

Click-to-define: Click any word for its reading, part of speech, and meaning.

100% offline: The tokenizer and dictionary are bundled in the extension. No servers, no tracking, no account. Nothing you read ever leaves your device.

Per-site control: Turn it on globally or only on the sites you choose.

Adjustable ruby size and color

▍ Pro (optional, one-time purchase)
Upgrade once to make the extension adapt to your exact level:

Adaptive furigana: Show readings ONLY on kanji harder than your JLPT level (N5–N1). The kanji you already know stay clean; as you level up, you see fewer readings.

Full dictionary: Every sense of a word, each tagged with its part of speech.

Example sentences: Real Japanese sentences with English translations.

Read-aloud: Hear the word pronounced (browser text-to-speech).

The free version stays fully functional forever — Pro removes the clutter and adds depth for serious learners.

▍ Privacy & Credits
Privacy: This extension does not collect, store, or transmit any personal data. All processing happens locally in your browser.

Dictionary data: JMdict/EDICT (EDRDG licence).
Example sentences: Tatoeba project (CC-BY).