tweetsnap

A Chrome extension for X / Twitter, Instagram, and Xiaohongshu cross-post workflows.

Screenshots

X Menu Actions

Instagram Autofill Result

What It Does

• Adds actions to the X/Twitter tweet three-dot menu:
  • Send to Xiaohongshu
  • Send to Instagram
  • Save Screenshot Locally
  • Download Video
• Captures tweets in mobile-friendly width for posting
• Autofills Xiaohongshu publishing fields (images + title + body)
• Autofills Instagram post flow (images + caption, final publish is manual)
• Adds Share to X in Instagram post three-dot menu
  • Opens X composer
  • Fills text
  • Uploads media in order (up to 4 items)

Install (Developer Mode)

1. Open chrome://extensions
2. Enable Developer mode
3. Click Load unpacked
4. Select this project folder

Usage

X/Twitter -> Xiaohongshu

1. Open a tweet
2. Click the tweet three-dot menu
3. Click Send to Xiaohongshu
4. The extension captures and autofills on Xiaohongshu

X/Twitter -> Instagram

1. Open a tweet
2. Click the tweet three-dot menu
3. Click Send to Instagram
4. The extension captures and opens Instagram compose flow

Instagram -> X

1. Open an Instagram post
2. Click the post three-dot menu
3. Click Share to X
4. The extension opens X composer and autofills text + media

Local Save / Video Download

• Save Screenshot Locally: downloads tweet screenshot as PNG
• Download Video: tries high-bitrate mp4 first, with fallback extraction

Limitations

• X media constraints apply; auto-upload currently targets up to 4 media items
• Some Instagram videos may fail due to source permissions/CORS
• Social platform DOM changes may require selector updates

Core Files

• manifest.json: extension configuration
• content.js: X/Twitter-side logic + autofill pipeline
• background.js: service worker for messages/download/fetch bridge
• xhs-autofill.js: Xiaohongshu autofill logic
• instagram-autofill.js: Instagram autofill + Share-to-X logic

License

MIT