BiliSub by cxx-u

Add multi-language subtitles to Bilibili videos using Google Translate, with auto-translated popup UI.

About this extension

BiliSub adds real-time multi-language subtitles to Bilibili videos. It automatically detects and enables available AI-generated Chinese subtitles, with a fallback to AI-generated English subtitles when Chinese subtitles are unavailable.

Subtitles are translated in real time using Google Translate and displayed as dual subtitles or translation-only subtitles. Users can choose from 100+ supported languages, toggle automatic translation, and adjust subtitle font size.

BiliSub requires an available AI-generated subtitle track from Bilibili. Videos without a supported AI subtitle track cannot currently be translated.

Key features:

Real-time subtitle translation
100+ target languages
Dual subtitles or translation-only mode
Automatic AI subtitle detection
AI Chinese subtitle fallback to AI English subtitles
Adjustable subtitle font size
Popup UI auto-translation - the extension popup interface translates to your selected target language
No API key required
Graceful fallback to original subtitles when translation fails

Rated 5 by 1 reviewer

Permissions and data

Required permissions:

Access browser tabs
Access your data for sites in the bilibili.com domain
Access your data for sites in the youtube.com domain

Optional permissions:

Access your data for sites in the bilibili.com domain
Access your data for sites in the youtube.com domain
Access your data for sites in the hdslb.com domain
Access your data for translate.googleapis.com
Access your data for translate.google.com
Access your data for lingva.ml
Access your data for api.mymemory.translated.net

Required data collection, according to the developer:

Website content