YouTube Subtitle AI

About

AI Subtitles - Subtitles, translation, and chat for any YouTube video.                                                                                                 
                                   
No captions on the video? No problem. AI Subtitles generates accurate subtitles for any YouTube video using Google's Gemini AI - even videos that have zero captions.  
                                                                                                                                                                         
GENERATE SUBTITLES FOR ANY VIDEO                                                                                                                                       
One click. Works on lectures, interviews, vlogs, foreign-language content — anything on YouTube. Subtitles display as a clean overlay directly on the video, matched to YouTube's native look.

TRANSLATE TO 50+ LANGUAGES
Select a language, hit translate. Original text stays visible above each translation so you can compare - great for language learning or verifying context.

CHAT WITH THE TRANSCRIPT
Ask questions about what you just watched. Get summaries, find specific moments, or dig into topics. Responses include clickable timestamps that jump straight to the
  relevant part of the video.

BUILT TO STAY OUT OF YOUR WAY
  - Sits neatly in YouTube's sidebar
  - Smart caching loads previously generated subtitles instantly
  - Adjustable font sizes and multi-speaker color coding
  - Dark/light theme matches YouTube automatically

FREE. PRIVATE. NO ACCOUNT NEEDED.
AI Subtitles runs on your own Gemini API key (free tier available from Google). Your key and all data stay on your machine — nothing sent to third-party servers, no tracking, no analytics.

GET STARTED IN UNDER A MINUTE:
  1. Install the extension
  2. Add your free Gemini API key (setup guide included)
  3. Open any YouTube video and generate subtitles

Built by Philipp Streicher.