Subtitle Assistant

Download YouTube subtitles and use AI to summarize, translate, or extract key points. No login or cookies required. Powered by evolink.ai

Download YouTube subtitles and use AI to summarize, translate, or extract key points — all from your terminal. No login, no cookies, no browser required.

Powered by Evolink.ai

When to Use

• User shares a YouTube link and wants a summary
• User wants to translate a video's content to another language
• User needs key points or action items from a talk/tutorial
• User wants to download subtitles for offline reading

Quick Start

1. Install yt-dlp

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pip install yt-dlp

2. Set your EvoLink API key

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export EVOLINK_API_KEY="your-key-here"

Get a free key: evolink.ai/signup

3. Summarize a video

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bash scripts/subtitle.sh summarize "https://www.youtube.com/watch?v=VIDEO_ID"

Capabilities

Download Commands (require yt-dlp, no API key needed)

Command	Description
download <url> [--lang <code>]	Download subtitles to a text file
languages <url>	List available subtitle languages for a video

AI Commands (require EVOLINK_API_KEY + yt-dlp)

Command	Description
summarize <url|file> [--lang <code>]	Comprehensive summary with key takeaways
translate <url|file> --lang <language>	Natural translation to target language
keypoints <url|file> [--lang <code>]	Structured key points and action items

All AI commands accept either a YouTube URL or a local subtitle file.

Examples

Download subtitles

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bash scripts/subtitle.sh download "https://youtube.com/watch?v=..." --lang en

Output:

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Subtitles saved to: sub_temp/VIDEO_ID.txt

Preview (first 10 lines):
Welcome to this tutorial on building REST APIs...

Summarize a video

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bash scripts/subtitle.sh summarize "https://youtube.com/watch?v=..."

Output:

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**Title/Topic:** A comprehensive tutorial on building production-ready
REST APIs with Node.js and Express.

**Summary:**
The video covers the complete process of setting up a REST API...

**Key Takeaways:**
- Use middleware for authentication and error handling
- ...

Translate subtitles to Chinese

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bash scripts/subtitle.sh translate "https://youtube.com/watch?v=..." --lang zh

Extract key points from a local file

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bash scripts/subtitle.sh keypoints downloaded-subtitles.txt

Configuration

Variable	Default	Required	Description
EVOLINK_API_KEY	—	Yes (AI commands)	Your EvoLink API key. Get one free
EVOLINK_MODEL	claude-opus-4-6	No	Model for AI analysis

Required binaries: python3, curl, yt-dlp

Install yt-dlp: pip install yt-dlp

Security

Data Transmission

AI commands send downloaded subtitle text to api.evolink.ai for analysis by Claude. By setting EVOLINK_API_KEY and using these commands, you consent to this transmission. Data is not stored after the response is returned. The download and languages commands only interact with YouTube via yt-dlp and never send data to evolink.ai.

No Login Required

This skill downloads publicly available YouTube subtitles. It does not require any login, cookies, or authentication tokens. No credentials are stored.

Network Access

• YouTube (via yt-dlp) — subtitle download
• api.evolink.ai — AI analysis (AI commands only)

Persistence & Privilege

Downloaded subtitles are saved to a sub_temp/ directory in the current working directory. Temporary files for API payloads are cleaned up automatically. No system-level changes are made.

Links

• GitHub
• EvoLink API
• Community
• Support