How to Dub a Video into Another Language with AI

To dub a video into another language with AI, you transcribe the speech, translate it, rewrite each line so it fits the time the original speaker took, voice it with a synthetic voice for each speaker, and mix the new voice over the original music and sounds. A dubbing tool runs that chain for you in minutes. Your part is to check the transcript before you start and review the handful of lines that don’t fit afterwards. Those two checks decide whether the result sounds professional.

This guide walks through the whole process in the BlaBlaScribe AI dubbing editor. The order and the checks are the same in any tool.

What AI dubbing does, step by step

“AI dubbing” is a pipeline of five jobs, and each one can fail in its own way. Knowing which step produced a problem tells you where to fix it.

Step 3 is the one most people don’t know exists. A good translation is often too long to speak in the time the original took: German and French usually run longer than English, and the W3C’s text-size reference lists typical expansion rates. So a dub needs two layers of text. The exact translation goes into the subtitles. A voice script, sometimes a little shorter, is what the voice reads. BlaBlaScribe keeps the two apart, so your subtitles stay faithful while the voice still fits the picture.

Before you start: a 5-minute checklist

• Source audio. Clear speech gives a clean transcript and clean background separation. Heavy music under speech or several people talking at once makes every later step harder.

• Speakers. Count them. Each one will need its own voice, and they should stay consistent from start to finish.

• On-screen text. Titles, lower thirds and slides stay in the original language. Dubbing changes the sound, not the picture.

• Rights. Dub only content you own or are licensed to adapt. If you plan to clone a voice, it has to be your own or one you have permission to use. Our guide to voice cloning rules covers consent in detail.

• Languages. Start with the languages your analytics already show. Viewers who watch in a second language are the easiest market to win.

How to dub a video with AI in BlaBlaScribe

Step 1: Upload and fix the transcript

Upload a video or audio file. The speech is transcribed and split by speaker automatically. Before you dub, skim the transcript: correct names, product terms and any line given to the wrong speaker. Every language you dub into inherits these corrections, and every mistake you miss. Ten minutes here saves re-voicing lines in each language later.

Step 2: Choose the language and a voice for each speaker

Open Dub, pick one of 27 languages, and assign a voice to each speaker. You can filter voices by female or male and listen to a sample before you choose. To keep the speaker’s own voice, choose Clone this speaker. The clone is made from that speaker’s speech in your file and needs at least 20 seconds of it. You confirm each time that you have the right to use the voice, and a clone costs the same as any library voice.

Step 3: Listen to a free 15-second preview

Before you spend any minutes, generate a free 15-second preview of your own video in the chosen language and voices. You get up to three previews per language. Listen for three things: whether the voice suits the speaker’s age and energy, how names and terms are pronounced, and whether the background level sounds natural. If a voice feels wrong, swap it and preview again.

Step 4: Dub the whole video

Click Dub the whole video. Each line is written to fit its slot. If the spoken line still runs long, it is sped up slightly (never more than about 1.2×), shortened, or allowed to borrow part of the pause after it. Lines that still don’t fit are flagged, so you know exactly which ones to look at.

Step 5: Review the flagged lines

Switch the language to Voice to see every line with its fit, and play the dub over your video. For each flagged line, either shorten it with one click, let it use the pause after it, or rewrite it yourself. Change the wording of one line and only that line is voiced again. You don’t regenerate the whole video.

Step 6: Export

Export an MP4 with the new voice and, if you like, subtitles burned in. The video is rendered in your browser from your original file, so keep that file at hand. Choose the sound:

• Voice, music and sounds: the original voice removed, like a studio dub.

• Voice over the quiet original: a documentary-style voice-over where the original stays faintly audible.

• Voice only or music and sounds only: separate stems for your own editor.

If you dubbed several languages, export all versions at once (one video per language), or download just the audio as M4A, MP3 or WAV.

What it costs

Dubbing is sold in minute packs that work with any BlaBlaScribe plan, including the free one. One minute of video dubbed into one language uses one minute, and the translation is included. Minutes don’t expire.

Example: a 12-minute tutorial dubbed into Spanish, German and Portuguese uses 36 minutes. A 30-minute and a 10-minute pack cover it for $54, with 4 minutes left for the next video. Current prices are on the pricing page.

A quality checklist before you publish

• Names and terms: listen to every line with a brand, a person’s name or an acronym. If the voice stumbles, spell it out phonetically in the voice text.

• Numbers and dates: “2026” and “1/3” can be read in different ways in different languages. Write them as words where it matters.

• Formality: decide on formal or informal address (du/Sie, tu/vous) per language and keep it the same throughout.

• Overlaps: check the places where speakers interrupt each other. These are the hardest to fit.

• A native listen: if you can, have one native speaker watch each language once. They catch the literal phrasing that sounds fine to you.

Common mistakes

• Dubbing before fixing the transcript. A misheard word becomes a mistranslated word in every language.

• Keeping every flagged line as it is. A sped-up voice sounds rushed. Shortening the line almost always sounds better.

• Skipping subtitles. A dub doesn’t replace captions for deaf and hard-of-hearing viewers. Export subtitles from the translation as well, with a subtitle translator or burned in with Add Subtitles to Video.

• Dubbing everything. Not every video needs a voice-over. Our comparison of subtitles vs dubbing helps decide which videos earn one.

Frequently asked questions

Does AI dubbing do lip sync?

Some tools re-animate the speaker’s mouth; BlaBlaScribe doesn’t. It times each line to the original speech, which works well for tutorials, courses, interviews and anything with B-roll. For tight close-ups where viewers watch the lips, a dedicated lip-sync tool is the better fit; our BlaBlaScribe vs Rask AI comparison covers that trade-off.

Can I dub a video for free?

You can hear a free 15-second preview of your own video in up to three previews per language. Dubbing the full video uses minutes from a pack, starting at $15 for 10 minutes.

Which languages can I dub into?

27, including English, Spanish, German, French, Italian, Portuguese, Polish, Dutch, Swedish, Turkish, Japanese, Korean, Chinese and Arabic. For subtitles only, the video translator covers 50+ languages.

Can I dub a podcast or other audio?

Yes. Upload the audio file and download the dubbed audio as M4A, MP3 or WAV: the voice alone or mixed with the background.

Will my dubbed video keep the music?

Yes. The original speech is separated from the background, and the music and sound effects play under the new voice.

Who processes my files?

Transcription and background separation run on our servers in Germany. The translation and voice script are written with Google Gemini, and the voices are generated by ElevenLabs, only when you start a dub. Details are in the privacy policy.

The bottom line

AI dubbing turns a week of studio work into an afternoon. The quality still comes from two human passes: a corrected transcript before you start and a review of the flagged lines at the end. Do both, listen to the free preview before you spend minutes, and keep subtitles alongside the voice. Try it on your own video with AI Dubbing.