Netflix has a 'Language' button. YouTube has auto-translated captions. But most of the time, neither of those is enough. Captions are slow, badly timed, and useless for content where tone and emotion matter — talk shows, sports commentary, drama, standup comedy. This is a guide to real-time dubbed audio for any video, on any major platform.
The 5-minute setup
Install SyncDub AI from syncdub.ai/download. Pin the icon. Open any video on a supported site (YouTube, Netflix, Prime Video, Disney+, Crunchyroll, Udemy, Coursera, Twitch, Vimeo, or any HTML5 player). Click the icon, choose your source and target language, hit play.
Why the dub sounds natural
Most dubbing tools stitch together a sentence, hand it to a translation model, and pipe the output through a generic text-to-speech engine. The result is robotic and slow. SyncDub streams partial transcripts in 80-millisecond windows and uses a single natural voice across all 70+ supported languages. The voice stays the same whether you're translating Korean, Portuguese or Hindi to English — so you don't get whiplash from one clip to the next.
Best sites to try first
- Korean variety shows on YouTube — fast, idiomatic, hard to subtitle. SyncDub's context window handles them well.
- Spanish football commentary — long monologues, slang, regional expressions. Translation feels live.
- French cinema on Mubi or Tubi — dialogue-heavy, easy to subtitle but easier to listen to dubbed.
- Japanese cooking tutorials — gentle pace, repeated vocabulary. Great for language learning.
FAQ
Does the dub sync with the video?
On supported sites, yes — the dub lags the original audio by about 320ms, which is below the threshold most people notice. Live streams have a longer lag (around 1.5 seconds) because we can't predict what's about to be said.
Can I keep the original audio underneath?
Yes. The extension has a 'duck' mode that lowers the original audio by 80% while the dub plays, then brings it back up if the dub pauses.
What languages are supported?
70+ languages including English, Hindi, Spanish, French, German, Portuguese, Japanese, Korean, Mandarin, Arabic, Bengali, Tamil, Telugu, Marathi, Gujarati, Kannada, Malayalam, Punjabi, Urdu, Russian, Italian, Turkish, Vietnamese, Polish, Ukrainian, and many more. The full list is at syncdub.ai/languages.