Watch Any Video.Understand Every Word.Instantly.
Hover any subtitle word to get instant translation, pronunciation, and real-world examples — without pausing or leaving the page.
"An enormous wave hit the shore."
"She felt an enormous sense of relief."
Works everywhere you watch
Features
Everything you need to learn while watching
An AI-powered pocket linguist, sitting on top of every video you play.
Word-by-word translation
Hover any word in subtitles to see its exact meaning, never miss context.
Real-world examples
See 3 example sentences from native content showing how the word is used.
TTS pronunciation
Hear any word spoken aloud by a native voice with one click.
Auto-pause on hover
Video pauses while you read the translation and resumes when you move on.
20+ interface languages
Full UI in English, Russian, Ukrainian, German, French, Spanish and 14+ more.
Fully customizable
Adjust font size, position, colors, background opacity and example count.
Save to dictionary
Click any word in the tooltip to add it to your personal vocabulary and review it later.
Keyboard shortcuts
Show or hide subtitles, synonyms, examples, copy a word to clipboard or save it to your dictionary — all without a mouse.
Learn words with SRS & Scrumble trainers
Build active recall with flashcard-based training and spaced repetition scheduling.
Embedded subtitle support
Read and translate subtitles directly from video files, even when they're hard-coded into the video.
AI subtitle generation
Generate subtitles automatically from audio in any video, then learn from them immediately.
See It in Action
No page reload. No new tab. Just instant understanding.
How It Works
Three steps to fluency
Install the extension
One click from the Chrome Web Store. No account, no setup.
Open any video with subtitles
YouTube, Netflix, TED, Udemy — the extension activates automatically.
Hover any subtitle word
Instant translation, examples and pronunciation appear right on top of the video.
Supported Video Platforms
Every Platform You Watch On
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Reviews
Language learners love it
"Finally I can watch videos in English without stopping every 5 seconds to look up words."
"The examples feature is incredible — I actually learn how words are used, not just their meaning."
"Works perfectly on any video content. Even with non-standard players."
"The auto-pause is a game changer. The video waits for me while I read the translation."
"I learned more English in a month watching videos than in a year of classes."
"Beautiful interface, no ads, no friction. Just the dictionary I always wanted."
The old way vs. the smart way
Without Sublern
- Pause video manually
- Open new tab to search the word
- Lose context and flow
- Forget the word by next day
With Sublern
- Hover to translate — zero interruption
- Examples show real usage immediately
- Auto-pause and auto-resume
- Pronunciation with one click
Frequently asked questions
Sublern works on YouTube, Netflix, TED, Udemy, Rutube, Disney+, Prime Video, Twitch, Plex, Jellyfin and any site using Video.js, Shaka Player or Playerjs.
Yes. The extension overlays its tooltip directly on the video, including in fullscreen and picture-in-picture modes.
Translation supports 30 languages. The interface is available in 20+ languages including English, Russian, Ukrainian, German, French and Spanish.
No. Translations are processed on demand and nothing about your viewing history is stored or sent to any server we control.
Yes. Sublern is 100% free, no account required, no premium tier, no ads.
Absolutely. Auto-generated captions work just like manual ones — hover any word for instant translation.
Start understanding more.
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