LiveSub: LiveSJP⇄EN subtitles for YouTube & Twitch by LiveSub

Live Japanese ⇄ English subtitles on YouTube and Twitch videos. Click Start on the LiveSub page or the icon on the video tab. Speech recognition and translation run in your browser. Audio never leaves your computer. Free.

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About this extension

LiveSub shows live subtitles over YouTube and Twitch videos — Japanese → English or English → Japanese.

How to use

Open livesubweb.com in one tab, and play a YouTube or Twitch video in another tab.
On the LiveSub page, press "Start (YouTube / Twitch tab)". You can also click the LiveSub icon on the video tab (shortcut: Alt+Shift+L).
Subtitles appear over the video and on the LiveSub page.

Private by design

Speech recognition and translation run inside your browser. The video's audio is passed only to the LiveSub page in the same browser and is never uploaded.
The add-on collects no data.

Good to know

The Firefox version works on YouTube and Twitch. For other sites, video calls and meetings, use LiveSub in Chrome or Edge.
English ⇄ Japanese only.
The first time, the speech recognition and translation data (a few hundred MB) is downloaded. After that it loads from your browser.
With a GPU, LiveSub uses a higher-quality translation model, and switches to a faster one automatically if it can't keep up.
Machine translation and speech recognition make mistakes, especially with background music, game sounds or several people talking at once.
Videos with DRM (copy protection) cannot be subtitled.

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LiveSub: LiveSJP⇄EN subtitles for YouTube & Twitch by LiveSub

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