Immerse Japanese does mechanical noun replacement — it doesn't use AI translation. This means it's fast, private, and works without sending your browsing data anywhere. The replacement may occasionally feel out of context — this is by design. The goal is vocabulary exposure, not perfect translation.
Chrome Extension
Japanese Learning
Free for N5
Learn Japanese from the English pages you already read
Japanese vocabulary comes to you while you read and watch — no daily habit required. English words stay readable, highlighted in place: hover to peek at the Japanese, click to save it for review.
Tried Duolingo? Streak broke? Anki deck untouched since spring?
The problem was never motivation — every study app taxes your time daily.
Immerse Japanese asks nothing: Japanese comes to you inside the reading and
watching you were going to do anyway.
How it works
1 · Read — words highlight in place; hover for kanji, kana, romaji, meaning, examples, audio.
2 · Watch — YouTube captions get the same treatment, free at N5: transcript panel, auto-pause, A/S/D keys.
3 · Review — saved words come back as spaced-repetition flashcards right before you'd forget them.
One loop: see a word in the wild, save it in a click, lock it in with spaced repetition. No textbook. No separate study app.
Features
English (highlighted) mode
The default: words stay readable in English, highlighted in place — hover to peek at the Japanese. Zero reading friction.
Free
4 Display Modes
English (highlighted), Replace (inline substitution), Below or Above (furigana-style annotations) — switch anytime.
Free
Works on Any Webpage
News, blogs, Wikipedia, Reddit — if you read it in Chrome, immersion runs on it. Single-page apps included.
Free
Replacement Rate Slider
Control exactly how much Japanese appears — from a gentle 10% to full 100% immersion.
Free
Full Hover Popup
Kanji, kana, romaji, every English meaning, JLPT + CEFR badges — every word fully explained.
Free
Real Example Sentences
Tatoeba example sentences shown right in the popup — see the word in context before you save it.
Free
Audio Pronunciation
Hear every word spoken in Japanese with one click.
Free
Stroke-Order Animations
Watch any kanji being written stroke by stroke — in the popup and on review cards.
Free
Save + Spaced Repetition Review
One click saves a word; SM-2 spaced repetition brings it back as a flashcard right before you'd forget.
Free
Progress Dashboard
Status buckets and a 365-day trend chart — watch your vocabulary grow week over week.
Free
Known Words + Quick Actions
Mark words known so they stay English. Set click / right-click to speak, save, or open Jisho.
Free
YouTube Captions — Free at N5
N5 words replaced inside YouTube captions for everyone, with transcript side panel, auto-pause per subtitle, and A/S/D navigation.
Free
All JLPT Levels — Pages & Captions
Unlock N4 through N1 plus News vocabulary — on web pages and inside YouTube captions alike.
PRO
Anki CSV Export
Send saved words straight into your existing Anki deck, tagged by JLPT level. Anki stays your deck — we feed it.
PRO
Run Everywhere — or Focus Mode
Block-list and allow-list site modes with one-click toggles. Sensitive pages (banking, payments) are excluded automatically.
Free
Clean Reading Controls
Body-text-only mode, first-occurrence-only mode, color-coding by level, Word of the Day, dark/light/auto theme.
Free
Private & Account-Free
Everything runs locally in your browser — no login, no data collection, no subscription. The dictionary ships inside the extension.
Free
Learn with YouTube
Free for everyone: N5 words are replaced inside YouTube captions as you watch — same hover popup, same example sentences. The suite includes a full transcript side panel with click-to-seek, auto-pause after each subtitle, A/S/D keyboard navigation, and live-stream support.
Premium upgrades the vocabulary, not access: captions replace words from every JLPT level — N4 through N1 and News — so immersion keeps pace with your progress.
JLPT Levels Explained
The Japanese Language Proficiency Test (JLPT) has five levels. Immerse Japanese scales with your ability:
- N5 (661 words, beginner) — free forever. No time limit, no credit card.
- N4 (2,195 words) — unlocked with one-time $29 purchase
- N3 (2,480 words) — included with full access
- N2 (1,896 words) — included with full access
- N1 (2,575 words, advanced) — included with full access
- CA — News (1,594 words) — words common in Japanese media and current affairs, outside the JLPT curriculum. Included with full access.
Pricing
Immerse Japanese is free to use at N5 level — no time limit, no credit card. Unlock all levels with a one-time payment.
Free — N5
$0
No account required · always free
- N5 vocabulary (661 words)
- YouTube captions: N5 words replaced, transcript panel, auto-pause, A/S/D keys
- All 4 display modes: English (highlighted), Replace, Below, Above
- Hover popup: kanji, kana, romaji + stroke-order animations
- Example sentences & audio pronunciation
- Spaced repetition review + progress dashboard
- Replacement rate slider (10–100%) & color-coded levels
- Word of the Day, body-only mode, known-words list
- Run everywhere or focus on chosen sites
Full Access — N4 to N1 + News
$29
One-time · yours forever
- All JLPT levels N5–N1 + News vocabulary (11,410 words total — 16× the free tier)
- Every level inside YouTube captions — pages and videos alike
- Everything in Free, plus:
- Anki export — saved words straight into your deck, tagged by JLPT level
- All future vocabulary updates included
Payment & Delivery
Payments are processed securely by Stripe. Full Access is a one-time purchase — there are no recurring charges. Access is activated immediately as digital access to the Chrome extension. No physical goods are shipped.
See our Refund Policy for details.
System Requirements
- Google Chrome (latest version recommended)
- Works offline — vocabulary data is bundled locally
- Windows, macOS, Linux, or ChromeOS