This web app allows you to easily sync a Youtube full reaction with the original video. All you need to supply are the link to the Youtube video, and your own copy of the video.

FAQ

• Q. What happens with my copy of the video? Is it uploaded to some server?
  A. Your video is not uploaded anywhere. It is streamed directly from your computer to the web page in your browser.
• Q. It's saying my video file is an invalid video format, but it plays fine in my media application?
  A. Different browsers support different video formats. For example, Firefox doesn't currently support .mkv, whereas Chrome does. You will need to convert your video format, or try a different browser.
• Q. Will you support anything other than Youtube, such as Patreon?
  A. No. This service is provided as-is. If your reaction channel doesn't provide full reactions on Youtube, then you will have to go back to your previous method of syncing videos.
• Q. How do I suggest a feature?
  A. This service is provided as-is. No requests will be taken at this time.

Disclaimer: this service is not affiliated with any Youtube reaction channels.