YouTube Chrome Extension
Free YouTube Video Summarizer & Subtitle Downloader Chrome Extension
NoteLM offers two free Chrome extensions: (1) YouTube Subtitle Downloader for one-click SRT/TXT transcript downloads in 100+ languages, and (2) YouTube Video Summarizer that generates AI-powered summaries with timestamps using free Gemini API. Both extensions are 100% free, privacy-focused, and work on Chrome, Edge, and Brave browsers — no account required.
Key Takeaways
- Free YouTube Subtitle Downloader
Download subtitles in SRT, VTT, or TXT format with one click. Supports 100+ languages including auto-translated captions.
- AI-Powered Video Summarizer
Generate AI summaries with chapters and clickable timestamps. Uses free Gemini API with 1M token context.
- YouTube Transcript Generator
Extract full transcripts from any YouTube video with timestamps. Export to multiple formats.
- Free YouTube subtitle downloader — no API key needed
- Download transcripts in SRT, VTT, or TXT format
- 100+ languages including auto-translated captions
Technical Specifications
| Supported Browsers | Chrome, Edge, Brave, Opera, Vivaldi |
| Subtitle Formats | SRT, VTT, TXT (all free) |
| Languages Supported | 100+ (including auto-translated) |
| API Key Required | Summarizer: Yes (free) | Subtitles: No |
| Data Collection | Zero — 100% privacy-focused |
| Account Required | No signup needed |
| Install Method | Chrome Web Store or Developer Mode |
How to Get Started
Set up YouTube Chrome Extension in minutes
Download Extensions
Get the YouTube Subtitle Downloader and Video Summarizer from GitHub or Chrome Web Store.
Install in Browser
Add to Chrome, Edge, or Brave. Works instantly — no account needed.
Optional: Add API Key
For AI summaries only: add your free Gemini API key (get at aistudio.google.com). Subtitles work without any key.
Download & Summarize
Click to download subtitles/transcripts in SRT format, or generate AI summaries with timestamps.
Use Cases
How people use YouTube Chrome Extension
Why Use This Integration
Free Forever
Both YouTube extensions are 100% free. Subtitle downloads require zero API key.
100+ Languages
Download YouTube subtitles in 100+ languages including auto-translated versions.
No Account Required
Start downloading subtitles and generating summaries immediately — no signup.
SRT Export
Export YouTube transcripts in industry-standard SRT format for video editing.
Limitations to Know
- ⚠Developer Mode required for GitHub version
- ⚠Video Summarizer requires free Gemini API key (1,500 requests/day)
- ⚠Firefox support planned for Q2 2026
- ⚠Subtitle download requires video to have captions available
Frequently Asked Questions
How do I download YouTube subtitles?
Install the NoteLM Subtitle Downloader extension, open any YouTube video, and click the download button. Choose SRT, VTT, or TXT format. No API key needed — works instantly.
Does the subtitle downloader work with all videos?
Yes, it works with any YouTube video that has captions (auto-generated or manual). Look for the CC icon on the video player to check caption availability.
Can I download subtitles in multiple languages?
Yes! Right-click the extension icon to see all available languages. You can download auto-translated subtitles in 100+ languages.
Do both extensions require an API key?
No. The Subtitle Downloader works completely free with no API key. Only the Video Summarizer needs a free Gemini API key (1,500 requests/day, no credit card).
Is the YouTube subtitle downloader safe?
Yes. We request minimal permissions, collect zero data, and the extensions are open-source on GitHub for transparency.
What browsers support these extensions?
Chrome, Microsoft Edge, Brave, Opera, and all Chromium-based browsers. Firefox support is planned for Q2 2026.
Written By
The NoteLM team specializes in AI-powered video summarization and learning tools. We are passionate about making video content more accessible and efficient for learners worldwide.
Sources & References
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