Practice a language with YouTube: dictation, shadowing, cloze
Paste any YouTube link, get sentence-split captions, then rotate through dictation, shadowing, cloze and listening.
LangKey Extension Not Detected
LangKey relies on the browser extension to extract YouTube video subtitles and bilingual alignment. Please install the extension and refresh to unlock full practice.
Four practice modes, four different skills
Dictation Mode
Play sentences and type what you hear — real-time feedback
Shadowing Mode
Read aloud with subtitles, speech recognition gives instant feedback
Listening Mode
Blur subtitles to train pure listening comprehension
Fill-in Mode
AI randomly masks key words to test your vocabulary and context feel
LangKey Platform Complete Walkthrough
4 simple steps to unlock YouTube & full-web immersive language learning
🧩 1. Install & Pin Extension
Search for LangKey Extension on Chrome Web Store or LangKey Home.
Click 'Add to Chrome' to complete installation.
Click the puzzle icon 🧩 in browser toolbar and pin 📌 LangKey.
After installation, refresh this page to trigger the immersive practice component!
🚀 2. Video Practice & Vocabulary Link
Copy any YouTube video link, paste it into the box and click 'Get Video'.
The right panel displays bilingual subtitles. Click ▶ 00:17 to seek video.
The left panel automatically scans and matches your favorited vocabulary.
Practice with dictation, shadowing, fill-in, and AI speaking evaluation below!
Turn any YouTube video into a language lesson
Paste a link and the page loads the video’s caption tracks, splits them sentence by sentence, and gives you four ways through the material: dictation to check spelling, shadowing to train pronunciation, hidden-text listening, and AI cloze that tests grammar and collocation. No downloads, no subtitle files to assemble by hand.
Watching with dual subtitles only proves you understood. Recall comes from producing the sentence yourself — typing it, saying it, filling in the words you missed. Whatever you save goes into a vocabulary bank that reappears on a spaced-repetition schedule, so watching time turns into language you keep.
Frequently asked questions
Do I need the browser extension?
You can paste a link and browse the video with its full caption list right away. Sentence-level dictation, shadowing feedback, and AI cloze read caption data through the free LangKey extension for Chrome, Edge, and Firefox.
Which video sites are supported?
This page’s link box is built for YouTube. The same extension supports Bilibili, Netflix and TED natively, with OCR fallback for any other captioned page.
Is this practice page free?
Subtitles, sentence dictation, shadowing and cloze practice are usable for free. Pro adds AI-generated exercises (CEFR-levelled dictation prompts), Anki sync and cloud study records; the core modes are enough for daily study.
Which languages can I practice?
Whatever the video is in — as long as YouTube has human or auto-generated captions for it. The interface itself ships in 10 languages: English, Simplified and Traditional Chinese, Japanese, Korean, French, German, Spanish, Portuguese, and Russian.
How is this different from a dual-subtitle extension?
Dual subtitles help you understand. Practice helps you recall: dictation forces you to decode sound into spelling, shadowing builds muscle memory, and cloze exposes the grammar and collocations you only half-know.