DuoSub

Watch streaming video with fully customizable dual subtitles — supports 100+ languages on Netflix, streamimdb.ru and more.

Watch your favorite shows effortlessly with dual subtitles in any two languages. Whether you're learning a new language or simply want clearer understanding, this extension makes bilingual watching smooth and enjoyable. 🔎 Who It's For DuoSub is built for viewers whose first language isn't English. If a movie only ships with an English CC track, DuoSub adds a second subtitle line in your own language, translated naturally by Google or AI so it actually reads like your language. Plenty of extensions can stack two existing CC tracks side by side. That isn't what this is. DuoSub fills in when your language isn't in the player's menu at all. ✨ What's New in the Latest Version • AI Immersive Translation: natural, context-aware subtitles powered by Gemini, GPT, or DeepSeek; reads the whole film before translating for tone and pronoun consistency • Audio Transcription mode: generates subtitles directly from the soundtrack when no CC track is available • Now supports streamimdb.ru • UI in English, 繁體中文, and 简体中文, switch it anytime from the popup 📍 Key Features • Display dual subtitles with support for 100+ languages • Fully customizable subtitle style: font size, color, weight, opacity, and background • Adjustable subtitle position, including its width and height • Works seamlessly in full-screen mode & sped up video • Automatically skip Netflix intros for faster playback 🔧 How It Works 1. After installation, click the extension icon to open settings. 2. Make sure to select English (CC) in your player. 3. Select your secondary subtitle languages. 4. Dual subtitles will appear automatically after processing. ⚙️ Some Useful Hotkeys • A — Open menu • C — Toggle the extension on / off • V — Toggle original subtitles • B (short press) — Switch between Google / AI translation • B (hold for 3s) — Start AI immersive translation Enjoy!