Foreign-language video is no longer a barrier
The PolyDub browser extension brings subtitle translation and AI dubbing to the video sites you already use — one click, and the language stops mattering.
Core features
A browser extension that adds AI dubbing, live subtitle translation and subtitle export to the video you watch on the web.
Real-time subtitle translation
Subtitle parsing and translation across multiple engines, so a foreign-language video is easy to follow.
Multiple languages, multiple engines
Several translation and speech services are built in, and you can switch between them at any time.
Works across major video sites
YouTube, Udemy, BiliBili, Coursera and more — plus standard VTT and SRT subtitle files.
Local video playback
Play video files straight from your machine, with VTT or SRT subtitles.
Subtitles and dubbing together
Translate the subtitles and generate an AI dub at the same time — study and watch in one pass.
Privacy first
Runs inside the page's own context and collects no unrelated data.
Plans and pricing
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A browser extension for AI dubbing, subtitle translation and subtitle export on web video.
Chrome, Edge and Firefox · Works with YouTube, BiliBili, Udemy and Coursera
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About the PolyDub AI video dubbing extension
PolyDub is a professional browser extension for AI video dubbing. It adds intelligent voice-over and subtitle translation to web video and online video. As a browser extension it installs into Chrome, Edge and Firefox. Core features include AI video dubbing, online subtitle translation, subtitle download and multilingual voice-over.
It works across the major online video platforms — YouTube, BiliBili, Udemy and Coursera among them. Advanced AI dubbing (Microsoft Azure TTS and Google TTS) produces natural, fluent speech, while a single click installs the extension and enables real-time subtitle translation with SRT and VTT export. Whatever you need — web video translation, online video dubbing or browser subtitle translation — PolyDub is built for it.