Any video, dubbed
into another language.
Dubbing AI listens to your video, works out who speaks and when, gives each person a consistent voice, translates the dialogue, and lays down a fresh spoken track in the language you pick — keeping the original music and effects. It runs 100% locally on your PC by default.
Windows 10 & 11 · 9 output languages · runs offline on your machine
Not a robot reading — a proper dub
Download SIU keeps the feel of the original scene: the background music, the sound effects and the timing all stay. Only the voices are replaced.
- Separates the voices from the music first, so the dub sits over the original score and effects instead of erasing them.
- Detects each speaker (diarization) — who talks, and exactly when.
- Gives every speaker a fixed, consistent voice from a real voice catalog, picked to match the detected voice type (male / female) and kept the same across the whole video, so characters don't swap voices between lines.
- Transcribes and translates the dialogue with the same local AI engines as Subtitle + AI (or your own OpenAI/DeepL key), then synthesizes the new spoken lines and time-stretches each one to fit the original timing.
- Remixes and re-muxes: the dubbed voice is mixed back with the original instrumental and written over the video — the picture is copied, not re-encoded.
Honest by design: Dubbing AI does not clone the original actor's voice — mature, free, offline voice-cloning simply isn't reliable yet. Instead it assigns a clean, consistent catalog voice per speaker, which is exactly what most re-dubs need.
9 output languages
Pick the language you want to hear. The best-quality voice engine available for that language is chosen automatically — you never have to fiddle with engines.
🇪🇸 Spanish · 🇬🇧 English · 🇫🇷 French · 🇩🇪 German · 🇮🇹 Italian · 🇵🇹 Portuguese · 🇯🇵 Japanese · 🇨🇳 Chinese (Mandarin) · 🇮🇳 Hindi
Local by default. Nothing uploaded.
- Free and offline. Speaker detection, translation and voice synthesis all run on your own computer with engines you download once. Your video and the dubbed audio never leave your PC.
- Optional cloud, your own key. If you'd rather use OpenAI/DeepL for the transcription and translation step, enter your own API key — it's stored encrypted on your device and we never see it. Cloud is optional and off by default.
- Runs in its own process. The heavy AI work happens in a separate background process, so the app window stays responsive while a dub is rendering.
Use it responsibly. Only dub audio or video you own or have permission to process. AI output can contain mistakes — review it before you publish or distribute it. See our Privacy Policy for the full details.
Get Download SIU
Windows 10 & 11 · local AI runs entirely on your PC · your files never leave your PC unless you choose an API key