furigana.it by vsakkas

A browser extension that annotates kanji with readings on demand. Right-click on any page and select Add furigana. Everything runs locally in your browser.

Features
- On-demand annotation of Japanese webpages
- Correct morphological parsing using kuromoji
- Proper okurigana handling — 食べる → 食(た)べる
- Selectable and copyable annotated text
- No server, no tracking, no analytics