You're watching a Korean game trailer drop, a Japanese streamer react to something big, or a Spanish-language esports broadcast — and you want to understand what's being said, live, as it happens. Most tools make you install a Chrome extension, download software, or tolerate a 10-second delay. This guide shows you how to do it with zero installs and under two seconds of latency.
StreamTranslate's Watch Party mode lets you translate any browser tab's audio in real time — YouTube videos, Twitch streams, Kick broadcasts, game announcement trailers, anything. You don't touch your microphone. You just pick a tab.
Watch Party mode is a feature in StreamTranslate that switches the translation source from your microphone to a browser tab. Instead of speaking into a mic, you open the video you want to translate in one tab, then point StreamTranslate at it. The audio gets transcribed and translated live, and subtitles appear either in an OBS overlay (if you're streaming) or directly in your translation dashboard.
It works because modern browsers ship with a built-in API called getDisplayMedia — the same tech that lets you share your screen in Zoom or Google Meet. StreamTranslate uses this API to capture just the audio from whichever tab you select, with no extension installation required.
No extension needed. Watch Party mode runs entirely in your browser using Chrome's native tab audio API. Nothing to install, nothing to download — just a browser tab and an internet connection.
In a new tab, open the YouTube video, Twitch stream, Kick broadcast, or any other audio source you want translated. Make sure the audio is playing or ready to play.
In a separate tab, open streamtranslate.live/control. Sign in if you haven't already. You'll see the translation dashboard with language selectors and a Go Live button.
At the top of the dashboard, you'll see two buttons: 🎤 My Voice and 📺 Watch Party. Click Watch Party. A hint will appear: "Pick a browser tab playing the stream..."
Click GO LIVE. Your browser will show a tab/window picker. Select the tab with the video you want to translate. Make sure "Share tab audio" is checked — this is the key setting that enables translation.
Within 1–2 seconds, translated subtitles will start appearing. If you're streaming to Twitch or YouTube and you have an OBS browser source set up, your viewers will see them in real time too.
Because Watch Party mode captures any browser tab, it works with virtually any audio-producing website:
Most real-time translation tools for browser audio come as Chrome extensions. Extensions like Live Translation or TranslateSub install into your browser and intercept tab audio at the extension layer. That approach works, but it comes with tradeoffs.
StreamTranslate's Watch Party mode is different. It's a web app that uses the same browser API extensions use — but you don't need to install anything. The translation happens on StreamTranslate's servers rather than locally, which gives you consistent quality at scale. And because it's part of StreamTranslate's full platform, the same translation session that you're watching privately can also be output as an OBS subtitle overlay for your viewers.
Extensions are fine for personal use. Watch Party is built for streamers who want their audience to see the translated subtitles too.
This is the real unlock. Say you're hosting a reaction stream: you react to a Japanese game reveal live on Twitch, and your English-speaking viewers want to understand what the developers are actually saying. With Watch Party mode:
You become the translator without speaking a word of the language. The content becomes accessible to all your viewers instantly.
Watch Party mode is available on the Unlimited plan. It's the only plan that supports tab audio capture instead of microphone input. Try it at streamtranslate.live/control.
Watch Party mode supports the same 30+ language pairs as standard StreamTranslate: Japanese, Korean, Chinese (Simplified and Traditional), Spanish, Portuguese, French, German, Arabic, Hindi, Russian, Italian, Dutch, Polish, Swedish, Turkish, and more. You pick the source language (the language the video is in) and one or two target languages (what you want to read).
No. Once you've picked a tab, StreamTranslate holds onto that audio connection until you stop the session or the tab's audio ends. You won't be asked to pick again mid-session — even if you switch browser tabs to do other things.
Yes, if you've added StreamTranslate as an OBS browser source. The subtitles appear in your OBS scene like any other overlay, and your viewers see them in real time. Watch Party mode outputs to the same overlay URL as standard mic mode.
StreamTranslate's speech recognition handles 30+ languages. If your source language isn't supported yet, the transcription step won't work accurately. Check the full language list in the dashboard.
Technically yes — Zoom and Google Meet both run in browser tabs (or you can use the web versions). Watch Party mode will capture their audio just like any other tab. It's not specifically designed for call translation, but the mechanics work.
Translate any YouTube video or live stream in real time — no extension, no download, no microphone needed.
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