Sublern — AI Translate Words in Video Subtitles by Vasili Korol

Sublern — AI-Powered Translation & Subtitles for Video

Watch videos on any site and instantly translate unfamiliar words using AI without switching tabs.
Sublern is a comprehensive AI-powered tool that translates words in real time and generates subtitles even when they're missing. Simply hover your cursor over any word in the subtitles — and you will see the AI-generated translation, usage examples, and be able to listen to the correct pronunciation. If the video has no subtitles at all, Sublern can generate them from audio or video using built-in speech recognition. Everything works right on top of the video, without distracting you from watching.

🎯 Why do you need Sublern?

AI-powered translation and subtitle generation make any video accessible for language learning. Sublern helps you learn languages, turning your favorite videos into personalized lessons powered by artificial intelligence. Subtitles become interactive — any word can be translated with one mouse movement. And if subtitles are missing, Sublern creates them for you.

✨ How does it work?

Open any video on your favorite site.
If subtitles are missing, Sublern generates them from audio or video.
Hover your cursor over a word in the subtitles.
An AI-powered dictionary instantly appears — translation, examples, and a pronunciation button.
Move the cursor away — the window disappears, and you continue watching.

🧠 Learn with SRS & Scramble

Turn your saved words into active knowledge. Practice with two powerful study modes:
• SRS flashcards — spaced repetition helps you remember words long-term.
• Scramble game — assemble the word from mixed letters to improve spelling and recognition.

⌨ Keyboard shortcuts

Control everything with hotkeys: toggle subtitles on/off, pause translation on hover, show alternative translations, enable usage examples, and turn pronunciation on/off — all without touching your mouse.

📚 Learning languages through video — a new level

Learning languages through video with Sublern happens naturally and without stress. You watch interesting content, and the AI-powered extension helps you understand unfamiliar words. Context and examples reinforce new words in memory much more effectively than rote memorization. And with built-in subtitle generation, you're never limited to videos that already have captions.
Sublern works on any site with video and text subtitles — from popular streaming platforms to educational websites. Even if subtitles are hard-coded into the video or missing entirely, Sublern can generate them for you.

🔊 Pronunciation and examples

Each AI-generated translation includes:
• Accurate translation of the word in context
• Usage examples in real phrases
• Pronunciation button to hear native speakers

🌍 Translation languages

Translate words from English to Russian, Spanish, French, German, Italian, Portuguese, Japanese, Chinese, Korean, and other languages. The translation language can be set with one click.
⚡ Why Sublern is the best choice
Traditional way: Stop the video, select and copy the word, open a new tab, paste into a translator, miss the moment.
Sublern: Video continues, just hover your cursor, translation right on the video, instant result, miss nothing. And with subtitle generation, you can watch any video, even without captions.

🔧 Settings to customize

• On/Off — toolbar button for quick activation
• Translation language selection — from the dropdown menu
• Auto-play — enable or disable pronunciation
• Subtitle generation — choose between video-based OCR or audio-based speech recognition

❓ Frequently Asked Questions

Which sites support subtitle translation?
All sites with text subtitles, including streaming platforms, educational websites, and video sharing services. If subtitles are missing, Sublern can generate them.

Can Sublern generate subtitles from any video?
Yes. If subtitles are hard-coded into the video (burned-in), Sublern uses OCR to read them. If there are no subtitles at all, it uses speech recognition to transcribe audio.

Does the extension slow down video?
No. Sublern uses local processing in your browser and does not affect loading or playback speed.

💬 We value your opinion

We hope Sublern makes learning languages through video engaging and productive. If you like the extension — please rate it. This will help other language learners find a video translator that actually works.
Send your ideas and suggestions in the reviews. Together we will make Sublern even better!
Learn languages, watch your favorite videos, and expand your horizons with Sublern! 🎓🎬