YouTube Bilingual Subtitles — AI by finder
Auto-overlay AI-translated bilingual subtitles on YouTube. Real-time, 7 languages, no account needed.
Some features may require paymentSome features may require payment
Extension Metadata
About this extension
Watch YouTube videos in any language — with real-time AI bilingual subtitles.
This extension automatically layers translated subtitles directly on top of YouTube videos as you watch. Original captions and AI translations appear together, perfectly time-synced.
How to Use
Install the extension
Get a free DeepSeek API key → platform.deepseek.com/api_keys
Open any YouTube video with captions
Click the extension icon → paste your API key → choose target language
Translated subtitles appear automatically on the video
Features
Dual Subtitles: Original text on top, AI translation below
AI-Powered: DeepSeek V4 for fast, accurate translations (~$0.00015 per video)
Three Display Modes: Bilingual / Translation Only / Original Only
Smart Cache: Re-watch a video costs zero API — translations load instantly from local cache
Export SRT: Download bilingual subtitles with timecodes
Customizable Display: Adjust font size, subtitle position, and margins
7 Target Languages: Chinese, English, Japanese, Korean, French, German, Spanish
Lightweight: No account, no tracking, no server — everything runs in your browser
Privacy
Zero data collection — your API key stays in local browser storage only
No server — API calls go directly from your browser to DeepSeek
No tracking — no analytics, no telemetry, no ad networks
Requirements
A free DeepSeek API key
YouTube videos must have captions enabled (auto-generated or manual)
This extension automatically layers translated subtitles directly on top of YouTube videos as you watch. Original captions and AI translations appear together, perfectly time-synced.
How to Use
Install the extension
Get a free DeepSeek API key → platform.deepseek.com/api_keys
Open any YouTube video with captions
Click the extension icon → paste your API key → choose target language
Translated subtitles appear automatically on the video
Features
Dual Subtitles: Original text on top, AI translation below
AI-Powered: DeepSeek V4 for fast, accurate translations (~$0.00015 per video)
Three Display Modes: Bilingual / Translation Only / Original Only
Smart Cache: Re-watch a video costs zero API — translations load instantly from local cache
Export SRT: Download bilingual subtitles with timecodes
Customizable Display: Adjust font size, subtitle position, and margins
7 Target Languages: Chinese, English, Japanese, Korean, French, German, Spanish
Lightweight: No account, no tracking, no server — everything runs in your browser
Privacy
Zero data collection — your API key stays in local browser storage only
No server — API calls go directly from your browser to DeepSeek
No tracking — no analytics, no telemetry, no ad networks
Requirements
A free DeepSeek API key
YouTube videos must have captions enabled (auto-generated or manual)
Rated 0 by 0 reviewers
Permissions and data
Required permissions:
- Access your data for www.youtube.com
Optional permissions:
- Access your data for www.youtube.com
- Access your data for api.deepseek.com
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 1.0.0
- Size
- 23.58 KB
- Last updated
- 4 days ago (Jun 15, 2026)
- Related Categories
- License
- MIT License
- Version History
- Add to collection