✦ AI Video Dubbing & Voice Cloning

Dub any video into
50+ languages

Clone voices, sync lips, export dubbed video — all running locally on your desktop.

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features

Everything you need to dub your videos

Voice Cloning

Clone a natural voice from a few minutes of audio. AI captures vocal characteristics and recreates them in 50+ languages.

50+ Language Dubbing

Select a target language, and the system auto-translates and generates culturally-appropriate speech.

Auto Transcription (ASR)

High-accuracy speech recognition powered by Whisper. Exports SRT/ASS subtitles simultaneously.

Lip-Sync & Timing

Aligns dubbed audio with lip movements so the final video looks as natural as possible.

Runs Fully Offline

No data sent to the cloud. All AI models run locally — complete privacy for your content.

Video & Subtitle Export

Export dubbed video + SRT/ASS subtitle files in one step. Supports MP4, MKV and more.

how it works

Four steps to dub your video

  1. 01

    Upload your video

    Drag-and-drop a video file or paste a YouTube/web URL. UltiVoice supports all major formats.

  2. 02

    Transcribe & translate

    AI converts speech to text, then translates it to your target language with high accuracy.

  3. 03

    Clone voice & dub

    TTS clones the original voice and generates dubbed audio, synchronized to the video timeline.

  4. 04

    Export & share

    Download your dubbed video, SRT/ASS subtitle file, or both — ready in seconds.

faq

Frequently asked questions

Which languages does UltiVoice support?
UltiVoice supports 50+ languages for both transcription and dubbing, including Vietnamese, English, Chinese, Japanese, Korean, Spanish, French and many more. See the full list in the documentation.
How good is the voice cloning quality?
Our TTS system uses F5-TTS and Whisper large-v3 to produce natural-sounding speech. Quality depends on the length and cleanliness of the sample audio — we recommend at least 30 seconds of clean audio.
Does UltiVoice work without an internet connection?
Yes. All AI models (Whisper, F5-TTS, translation) run entirely locally on your machine. No internet connection is required after installation and license activation. Your data never leaves your device.
Which video/audio formats are supported?
Input: MP4, MKV, AVI, MOV, WebM and other FFmpeg-compatible formats. Output: dubbed MP4 video + SRT/ASS subtitles. Supports YouTube URLs and popular video services.
How does licensing work? Can I use it on multiple machines?
The Pro license allows 1 machine (hardware-bound). The Studio license allows 3 machines. Licenses are validated via HWID and can be transferred through the account management portal.
Is macOS or Linux supported?
UltiVoice currently supports Windows 10/11 x64. macOS and Linux support is on the roadmap — follow the blog for updates.

get started

Dub your video in minutes.

Download for free, activate your license, start dubbing today.

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