---
title: "AI Video Dubbing: Re-Voice a Video in Another Language"
description: "Dub a video into another language with an AI voice, free. Speech, translation and voice all run in your browser, and each line is fitted to its original moment."
canonical: https://toolsugar.com/tools/ai-dubbing
image: https://toolsugar.com/og.png
---

# AI Video Dubbing

ToolSugar AI Dubbing transcribes a video, translates each line and reads it in a new AI voice, timed to when the line was first spoken. Speech, translation and voices all run on your device, so nothing is uploaded. Small models slip, so check the SRT. The result replaces all the original sound.

Runs on your device

## How it works

1. Drop a video and, if detection gets it wrong, pick the spoken language. Speech recognition runs in your browser.
2. Pick the language to dub into, then a voice. Japanese, Chinese, Korean and Arabic have no voice yet.
3. Press Dub video, then download the MP4 and an SRT file of the translated lines.

## Key facts

- **Timing**: Each line stays in its own slot. Speed changes between 0.9x and 1.6x, and pitch is kept
- **Dub languages**: English, British English, Spanish, French, German, Hindi, Italian and Brazilian Portuguese
- **File size limit**: 500 MB for H.264 video, 120 MB for other formats that need encoding, and half of that on phones
- **Downloads**: Speech is about 77 MB, or 206 MB with WebGPU. Translation is about 632 MB. Most voices add about 86 MB. All are cached after the first run

## Common uses

- Giving a product demo a second language track without booking a voice actor.
- Turning a talking-head lesson into a version for students who speak another language.
- Testing whether a video finds an audience abroad before paying for a studio dub.

## Questions

### What happens to the music and sound effects?

They are gone. The new voice replaces the whole original audio track, because this tool does not separate speech from music. If the background matters, keep the original video and use the SRT file with your own editor to mix the dub in by hand.

### Does each person in the video get a different voice?

No. One voice reads every line, so a two-person interview ends up sounding like one narrator. The tool also does not move the speaker's lips. It works best for one person talking, such as a tutorial, a lesson or a voice-over.

### What if a translated line is longer than the original?

The line is sped up to fit, as far as 1.6 times normal speed. If it still runs past the moment the next line starts, its end is cut with a short fade, and the result tells you how many lines that happened to.

### Why is Arabic listed if it cannot be dubbed?

We have no Arabic voice that runs in the browser, and the same goes for Japanese, Chinese and Korean, so the tool says that plainly and leaves the button off rather than failing halfway. Subtitles still work: Video Translator can write captions in those languages.

[Read the AI Dubbing guide](https://toolsugar.com/blog/how-to-dub-a-video-with-ai)

## Related tools

- [Video Translator](https://toolsugar.com/tools/translate-video)
- [Auto Subtitles](https://toolsugar.com/tools/subtitle-generator)
- [Text to Speech](https://toolsugar.com/tools/text-to-speech)
- [Video Language Changer](https://toolsugar.com/tools/video-language-changer)