Immersive Japanese — Japanese Vocabulary While Browsing

Learn 15,000+ JLPT Japanese words passively while browsing in English. Includes interactive reviews and Anki export.

Immersive Japanese is a Chrome extension that teaches you Japanese vocabulary while you browse English websites and watch YouTube. Japanese words appear inside the English text and video captions you already consume — no need to switch languages, open a study app, or maintain a daily streak. It sounds impossible until you try it: you stay in English, yet you naturally absorb kanji, kana, and meaning. Hover any word for readings, JLPT level, and pronunciation. Save words to the built-in smart flashcard review or export them to Anki. Review on your own schedule — no guilt when you skip a day. /////How It Works///// 1. Browse or watch normally — Visit any English website or YouTube video 2. Words transform in place — 15,000+ English words mapped to Japanese equivalents (nouns, verbs, adjectives, adverbs) 3. Hover to learn — Kanji, kana, romaji, meanings, JLPT level badge (N5 to N1), audio pronunciation, example sentences, stroke-order animation 4. Control the immersion — Replacement rate slider (10–100%), first-occurrence mode, or press Alt+J / Ctrl+Shift+J to toggle instantly 5. Save and review — One-click word saving with built-in smart flashcard review (Again / Hard / Good / Easy scheduling). Export to Anki (Premium) /////Free — No Account Required///// ・JLPT N5 vocabulary — 1,075 core beginner words integrated into English text and YouTube captions ・YouTube Japanese vocabulary — Japanese words appear inside live captions (N5 level); full transcript panel with click-to-seek, auto-pause, and A/S/D keyboard navigation ・Four display modes — English highlight, romaji, kana, or full kanji replacement ・Rich hover popups — Kanji, kana, romaji, meanings, audio, example sentences, stroke-order animation ・Smart flashcard review — Built-in review system that schedules words based on how well you know them. Save words as you encounter them ・Progress tracking — Vocabulary growth charts and Word of the Day ・Site controls — Allow-list/block-list, body-text-only, dark/light/auto theme /////Premium — $29 Once. No Subscription.///// ・JLPT N5, N4, N3, N2, N1 + news vocabulary — 15,000+ words across all JLPT levels on every website and YouTube video ・Anki export — Send saved words directly to your Anki deck, tagged by JLPT level ・Lifetime license — Pay once, own forever. If development stops, the extension keeps working. /////The Paradox: Japanese from English///// Most tools force you to choose: study Japanese in a dedicated app, or don't study at all. Immersive Japanese removes that choice. You read English. You watch English. Japanese vocabulary meets you there. Zero Japanese literacy required — Start with romaji mode, switch to kana or kanji anytime No daily session to maintain — Passive exposure happens automatically; review flashcards when you want No arbitrary word lists — Every saved word is one you actually encountered while reading or watching /////How Is This Different?///// vs. Flashcard & Study Apps (Anki, Duolingo, Bunpro, WaniKani) Those tools require you to open an app and maintain a daily habit. Immersive Japanese brings Japanese into your existing browsing. Use the built-in smart flashcards or Anki export on your own schedule — no streak pressure. vs. Dictionary & Lookup Tools (Yomitan, Yomichan, Rikaikun) Lookup tools help you read Japanese text. Immersive Japanese works in reverse: it inserts Japanese into English pages, so you learn vocabulary before you can read a Japanese newspaper. vs. YouTube Subtitle Extensions (Language Reactor) Language Reactor is built for active video study. Immersive Japanese adds passive vocabulary replacement across the entire web and YouTube, with one-click saving and smart flashcard review. /////Privacy First///// All word replacement happens locally in your browser. No page content or browsing history is ever sent to any server. Premium license validation checks your key only — no tracking, no analytics. /////Frequently Asked Questions///// Q: Does this cover JLPT vocabulary? Yes. Free includes JLPT N5 (1,075 words). Premium unlocks JLPT N4, N3, N2, N1, and news/current-affairs vocabulary — 15,000+ words total. Q: Do I need to know hiragana or katakana? No. Start with romaji display and switch to kana or kanji when ready. Q: Does it work on all websites? It works on most sites. Strict Content Security Policy pages (some enterprise tools) may limit extension functionality. Q: Can I control how many words appear? Yes — replacement rate slider (10–100%) or first-occurrence mode. Q: What if I lose my license key? Recover instantly by email in the extension popup, or contact support for manual lookup. Q: Is this the best Chrome extension to learn Japanese while browsing? If you want to acquire Japanese vocabulary without switching to Japanese content or maintaining daily study sessions, yes. Immersive Japanese is built specifically for passive immersion inside your normal English browsing and YouTube watching. /////Attribution///// Japanese vocabulary data from JMdict (EDRDG, CC BY-SA 3.0). Kanji stroke-order data from KanjiVG (CC BY-SA 3.0).