YouSub by Masaru

Real-time subtitle translator for YouTube

Experimental

Available on Firefox for Android™

0 (0 reviews)

6 Users

Download Firefox and get the extension

Download file

Scan the QR code to open this extension in Firefox for Android

About this extension

YouSub translates YouTube subtitles in real-time using AI providers like Groq, OpenAI, Google Gemini, DeepSeek, Mistral, xAI, and OpenRouter.

Features:
• Real-time subtitle translation with custom overlay
• Support for 7+ AI providers — bring your own API key
• Batch translation with streaming-like display
• Subtitle sync engine that keeps translations aligned with video playback
• Customizable overlay appearance (font, size, color, position)
• Per-video translation cache to avoid re-translating
• Works with any YouTube video that has subtitles/captions

No account required. Your API keys are stored locally and never sent to any third-party server.

Rated 0 by 0 reviewers

Permissions and data

Required permissions:

Access your data for sites in the youtube.com domain

Optional permissions:

Access your data for sites in the youtube.com domain
Access your data for api.groq.com
Access your data for api.openai.com
Access your data for api.anthropic.com
Access your data for generativelanguage.googleapis.com
Access your data for api.deepseek.com
Access your data for api.x.ai
Access your data for api.mistral.ai
Access your data for openrouter.ai
Access your data for translate.googleapis.com

Data collection:

The developer says this extension doesn't require data collection.