AI voice-over for YouTube videos, from script to MP4
For recaps, reviews and explainers you usually want one clear narrator rather than a cast. DubLocal Studio's Narration mode reads your script with a single AI voice over the whole video, turns the original audio down underneath and exports an MP4 ready for YouTube.
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Updated October 2026 · The DubLocal team
How to add an AI voice-over to a video
- 01
Open the video
Choose the language of the video and the language of the voice-over.
- 02
Choose Narration
In the Script step pick Narration: no casting, one narrator for the whole video.
- 03
Write or edit the script
Start from the transcribed and translated dialogue, or rewrite every line in your own words.
- 04
Pick the narrator
Choose a narrator voice and reading speed, and listen line by line.
- 05
Export for YouTube
Add your logo and channel name, make a thumbnail and render the MP4.
Exporting with logo, 16:9 frame and thumbnail
Add a logo and channel name, choose the frame and a thumbnail style, then render the video.
Voice-over that follows the picture
Every line is placed on the timing of the line it replaces, so the narration stays in step with the video. Make a line longer or shorter on the timeline to slow it down or speed it up.
Ready to publish
The Export step has what a channel needs:
- Logo and channel name placed clear of the edges
- Landscape 16:9 for YouTube or vertical 9:16 for Shorts
- 19 thumbnail styles made from a frame you choose
- Subtitles burned in, or an SRT file to upload
No per-minute bill
Long reviews and full-film recaps cost the same as a short: the license runs for a period of time with unlimited videos.
Watch DubLocal Studio from start to finish (Vietnamese audio)
The tutorial covers installing, opening a video, transcribing, translating, casting, generating voices and exporting MP4.
Frequently asked questions
Is AI voice-over allowed on YouTube?
YouTube allows synthetic voices; follow its rules on disclosing altered or synthetic content where they apply, and only use footage you have the rights to.
Can I change the reading speed?
Yes. Set the narrator's speed for the whole video (0.8–1.3×) and adjust single lines on the timeline. In fast dialogue a long line is read faster, up to the speed you choose (1.0–1.6×), so two lines never play at once.
Does the original audio stay?
In Narration mode the original audio stays underneath, turned right down, so music and atmosphere remain.
Can I use my own script instead of a translation?
Yes. Every line is editable, so you can write the narration yourself and Studio reads what you wrote.
Which languages can the voice-over be in?
Any of Studio's 10 languages: English, Chinese, Japanese, Korean, Thai, Vietnamese, French, Spanish, Indonesian and German.