LocalSubs

Real-time, fully local AI subtitle translation for streaming video. Translates English subtitles to Traditional Chinese on-device using a fine-tuned 0.6B model — no data leaves your machine.

intro.mp4

Requirements

• macOS (Apple Silicon or Intel)
• Chrome / Chromium

Installation

brew tap aiden1020/localsubs
brew trust aiden1020/localsubs
brew install localsubs

localsubs model download   # ~424 MB, one-time
localsubs install           # connect to Chrome

brew trust is required because LocalSubs is distributed via a third-party tap. It authorizes Homebrew to install formulas from this tap on your machine.

Then install the LocalSubs Chrome extension and start watching.

Commands

Command	Description
localsubs model download	Download the translation model
localsubs install	Connect to Chrome
localsubs status	Check if the helper is running
localsubs doctor	Run a full diagnostic
localsubs logs	Print log file paths
localsubs version	Print version

Model

Uses SubtitleEN2TW-0.6B, a fine-tuned GGUF model optimized for subtitle-length English → Traditional Chinese translation.

License

Apache 2.0 — see LICENSE.