Japanese Word Replacer

Learn Japanese vocabulary passively while you browse. Japanese Word Replacer scans the English pages you read and swaps everyday nouns for their Japanese kanji equivalent — right in the sentence, so you see real vocabulary in context instead of a flashcard deck. Hover any replaced word to see: • Kanji and kana • Romaji reading • English meaning • JLPT level (N5–N1) How it works • Pick which JLPT levels you want to practice (N5 through N1) — nothing is replaced until at least one level is selected. • Control how many words get replaced per page with a simple slider. • Block any site with one click from the popup if you'd rather it stayed English-only. Everything runs locally. The word list ships with the extension — no page content, browsing history, or personal data is ever sent anywhere. Great for JLPT learners who want to build vocabulary recognition through everyday reading rather than dedicated study sessions.