Skip to content

Movie translator

A movie translator for the film you made. Dubbed, not subtitled.

Translate a movie you made or licensed. Upload a short, a documentary, a trailer or a feature and choose one of 28 languages. DubSync translates the dialogue, gives each actor a voice created from their own, keeps your score and effects, and returns a dubbed MP4. It is not a way to watch someone else's film in your language.

Translate my video intoUpload my film

Pro: 7 days free for eligible new subscribers, with 60 minutes. Card required. Then $29.90/month; cancel before the trial ends to pay nothing. Trial minutes expire after 7 days.

Upload an MP4, MOV or M4V. You see the minutes and the cost before anything starts.

EnglishOriginal

What is said: I have waited 10 years to tell you this. Sit down. You deserve to hear it in your own language.

What is said: He esperado 10 años para decirte esto. Siéntate, mereces escucharlo en tu propio idioma.

What is said: Esperei dez anos pra te contar isso. Sente-se, você merece ouvir isso na sua própria língua.

Demo clip: an AI-generated scene with a fictional character. Dubbed with VDub v2, the model DubSync runs; lip-synced tracks use VSync v2.

Lip-sync shown in these examples is an optional paid add-on, separate from the dubbing trial.

28 target languages
Up to 150 min / 1 GB per video
MP4 out, no visible watermark
Background audio kept
Pay per input minute

Start here

Three things people mean by a movie translator.

The same search covers three different needs. DubSync does the first.

A dubbed version of your own film
- What DubSync does
- A film you own or licensed
You upload the finished film and download an MP4 with the dialogue spoken in the new language, each speaker in a voice created from their own.
How to dub a video
Subtitles for your film
- Not DubSync
- A subtitle tool
Text over the picture, with the original voices left as they are. A festival submission can require them.¹ DubSync doesn't make subtitle files or transcripts.
Dub vs sub for creators
A foreign film you want to watch
- Not DubSync
- An official release
To watch a movie in your language, look for an official dubbed or subtitled release. Netflix, for example, shows the languages available for each title, and they vary from title to title.² DubSync is not a live translator for a cinema or a streaming app, and a film you don't own is not yours to dub.

What a dub changes

One layer of the mix is replaced. The rest of the film stays.

A film is a picture, a score, sound design and a cast. Dubbing swaps the spoken lines and nothing else.

Narration, interviews and dialogue

This demo is an AI-generated nature scene with an English narrator. Switch it to French, German or Japanese: the picture stays and only the narration changes. These tracks are plain dubs, with no lip-sync.

A voice for each speaker, created from the original performance: similar, not identical. You can't pick a voice or recast a role.
Score, ambience and effects are kept under the new lines. You upload the final mix: stems can't be uploaded, and you don't get stems back.
A dub doesn't touch the picture. Titles, signs, burned-in subtitles and credits stay in the original language.

EnglishOriginal

What is said: For thousands of years, this coast has looked the same. Only the language of the story changes.

Demo clip: an AI-generated scene with a fictional character. Dubbed with VDub v2, the model DubSync runs; lip-synced tracks use VSync v2.

Film-sized files

The limits to plan a feature around.

A trailer or a single scene usually fits as exported. A feature needs planning, and file size matters more than running time.

Longest file: 150 min; 2.5 hours of film in one upload.
Largest file: 1 GB; The limit a film reaches first.
Target languages: 28; One per project. Each one uses the film's minutes again.
Lip-sync per run: 5 min; An optional paid add-on, for a dub no longer than this.

YouTube's recommended bitrate for a 1080p upload at standard frame rates is 8 Mbps.³ At that rate, 1 GB holds about 16 minutes of picture. A 90-minute film fits in one file only at an average of about 1.5 Mbps, sound included, which is below the 2.5 Mbps the same table lists for 480p. So a feature goes in one of two ways.

Export a lighter copy
Render the whole film as one MP4 with a smaller frame or a lower picture bitrate. Keep the sound quality: the new voices are created from it. The dubbed MP4 can't look better than the file you uploaded, so extract its audio in your editor and lay it under your full-quality master.
Split the film into parts
Cut at scene changes, never mid-line. Each part is its own project and is dubbed on its own, so a character's voice may not match exactly across a join. Listen there first. The minutes add up to about the same total.

Is the film already on YouTube? Automatic dubbing there is on by default for eligible creators, but a video longer than 120 minutes is not eligible.⁴ If a track on that upload is all you need, start there.

Where it holds up

A dub translates a performance. It doesn't act it again.

Film leans on acting more than most video. That is where an automatic dub is weakest, ours included, so choose your test scenes with care.

Works well

Documentaries: a narrator, and interviews where one person speaks at a time.
Clean production sound, with the score mixed under the voices.
Short films, trailers and teasers with a small cast.
A first version for a market where the film has no release, before you commission a studio dub.

Take care

Whispers, screams, sobbing and laughter. A dub built for speech may flatten or miss them.
Crowds, arguments and overlapping lines: voices can get mixed up.
Songs and musical numbers. Speech dubbing isn't made for singing.
Scenes that switch between two spoken languages. Detection is automatic and can't be set scene by scene.
Wordplay, slang and names. The translation is automatic and there is no script editing.
A distributor or broadcaster with its own dubbing specification. Ask for it before you rely on an AI dub.

In March 2025 Prime Video began a pilot of AI-aided dubbing in English and Latin American Spanish, initially on 12 licensed movies and series. It said the dubs were only for titles that had no dubbing, and that localization professionals work with the AI on quality control.⁵ An AI dub is best seen that way: a version for a film that would otherwise have none, not a replacement for a directed cast.

How to translate a movie

From picture lock to a dubbed version in five steps.

Lock the cut and the mix
Dub the finished film. If the edit changes later, the dub has to be made again, and every run uses minutes.
Test one hard scene first
Export your most emotional scene, upload it and choose a language. You see the input minutes and the cost, and nothing starts until you confirm your rights and your cast's consent.
Watch the test with a native speaker
Check the acting, the names and the places. There is no script editing, so a wrong line can't be corrected in a finished dub. Better to learn that from one scene.
Trim, export and dub the film
Minutes are counted for the whole file, so cut long end credits and sung numbers first. Export MP4, MOV or M4V, up to 150 minutes and 1 GB: for a feature, a lighter copy or several parts. Then dub it, one target language per project.
Finish it in your editor and release it yourself
Lay the dubbed audio under your master, put the credits and songs back, and translate titles and on-screen text. DubSync doesn't publish to any platform. On YouTube, creators with access to advanced features can add the dub to the same video as an extra audio track, from an audio-only file about as long as the video.⁶

Subtitles or a dub

Which translation does your film need?

They do different jobs, and DubSync makes only one of them.

Subtitles and an AI dub for a film, side by side
	Subtitles	AI dub with DubSync
What changes	Text is added over the picture. The original voices stay	The spoken lines are replaced. The picture stays
Performance	Left as recorded	A voice created from each actor: similar, not identical
Festivals and awards	Asked for when the film is not in English¹⁷	Not a substitute. Submit the original with subtitles
From DubSync	No. Use a subtitle tool	Yes: a dubbed MP4 with no visible watermark

Before you upload

Translate only a movie that is yours to translate.

A translation is a derivative work under US copyright law, and the right to prepare one belongs to the copyright owner.⁸ Laws differ by country, and this is not legal advice. A licensed film qualifies only if the contract covers a new language version.
Your cast has a say. Each new voice is created from an actor's performance, so check their contracts and get agreement in writing where a contract is silent.
A film you watched does not qualify, and a new voice track doesn't change whose film it is. On YouTube, Content ID automatically scans uploaded videos against audio and visual files from copyright owners. Depending on the owner's settings, a match blocks the video, runs ads on it or tracks its views.⁹
On labels: YouTube requires creators to disclose realistic content that was generated or meaningfully altered with AI. Cloning your own voice for dubs is on its list of things that need no disclosure, but a cast's voices are not your own.¹⁰ Other platforms have their own rules.

A public-domain film settles only the copyright question. The people whose voices are in it still have to agree, and DubSync asks you to confirm both. To monetize one on YouTube you must be able to prove that it is in the public domain,¹¹ and its reused-content policy is separate from copyright, so public-domain status does not settle it.¹² More in can you monetize dubbed videos.

Questions

Questions before you start

Can I translate a movie from Netflix, a DVD or a streaming site?

No. A film you watch is not yours to translate, and DubSync takes an uploaded file, not a link. You confirm your rights and every speaker's consent before each dub. To watch a film in your language, look for an official dubbed or subtitled release. On Netflix, for example, the audio and subtitle settings show the languages available for that title.²

Is DubSync a movie translator app that works while I watch?

No. It is not a live translator, and it doesn't run in a cinema or on top of a streaming app. You upload a finished video file (MP4, MOV or M4V) that you have the rights to, and you download a dubbed MP4.

Which languages can I translate a movie into?

Any of the 28 target languages, among them English, Spanish, French, German, Japanese and Hindi. The language spoken in the film is detected for you. Each target language is its own project and uses the film's minutes again. See every language.

How long can a movie be?

Up to 150 minutes and 1 GB per file. Size is the limit a feature reaches first, so upload a lighter copy or split the film into parts. Each part and each target language is its own project.

How much does it cost to dub a movie with AI?

By the input minute: the length of the film, counted once for each target language. A 90-minute feature uses 90 input minutes per language, so check on the pricing page what each plan and pack includes. You see the minutes and the cost after you upload, and the dub starts only when you confirm.

Will the dubbed voices sound like my actors?

Similar, not identical. Each voice is created from that actor's speech in the film, so clear dialogue with little background noise helps. An automatic dub may not carry every shade of a performance, so judge it on your hardest scene.

Can I get subtitles or a translated script as well?

No. DubSync makes a dubbed video. It doesn't make subtitle files, captions or transcripts, and there is no script editing. If a festival asks for English subtitles, that is a separate job for a subtitle tool or a translator.

Can I lip-sync a whole film?

No. Lip-sync is an optional paid add-on for a finished dub of up to 5 minutes, so it suits a trailer or one close-up scene uploaded as its own project. It is priced per minute for the whole video, shots without a face included, and you see the quote before it starts. It works best with a clearly visible face. The Spanish and Portuguese tracks of the demo at the top of this page are lip-synced. A plain dub leaves the mouths as they were filmed.

Plans from $4.90/month. You see the minutes and the cost before anything starts. See pricing

Sources

Sundance Institute. Submitting Your Project to the 2027 Sundance Film Festival (submissions FAQ, PDF). Accessed Oct 5, 2026.
Netflix Help Center. How to change the language on Netflix. Accessed Oct 5, 2026.
YouTube Help. YouTube recommended upload encoding settings (help article 1722171). Accessed Oct 5, 2026.
YouTube Help. Use automatic dubbing (help article 15569972). Accessed Oct 5, 2026.
About Amazon. Prime Video begins an AI dubbing pilot program on licensed movies and series. Published Mar 5, 2025; accessed Oct 5, 2026.
YouTube Help. Add Multi-language features to your videos (help article 13338784). Accessed Oct 5, 2026.
Academy of Motion Picture Arts and Sciences. 99th Academy Awards rules. Rule Sixteen: Special Rules for the International Feature Film Award (PDF). Accessed Oct 5, 2026.
U.S. Copyright Office. Copyright Law of the United States (Title 17), Chapter 1: Subject Matter and Scope of Copyright (sections 101 and 106). Accessed Oct 5, 2026.
YouTube Help. How Content ID works (help article 2797370). Accessed Oct 5, 2026.
YouTube Help. Disclosing use of GenAI content. Accessed Oct 5, 2026.
YouTube Help. What kind of content can I monetize? (help article 2490020). Accessed Oct 5, 2026.
YouTube Help. YouTube channel monetization policies (help article 1311392). Accessed Oct 5, 2026.

Test before you commit

Hear your hardest scene in another language first.

Upload it, see the minutes, then decide about the rest of the film.

Only upload videos you have the rights to, with every speaker's permission.