{"id":6026,"date":"2026-09-29T12:00:00","date_gmt":"2026-09-29T16:00:00","guid":{"rendered":"https:\/\/www.thevoicerealm.com\/blog\/?p=6026"},"modified":"2026-09-29T12:00:00","modified_gmt":"2026-09-29T16:00:00","slug":"dubbing-voice-acting-lip-sync","status":"publish","type":"post","link":"https:\/\/www.thevoicerealm.com\/blog\/dubbing-voice-acting-lip-sync\/","title":{"rendered":"Matching the Mouth: What Dubbing Voice Work Really Asks of You"},"content":{"rendered":"

This guide is for voice actors who’ve done a bit of narration, commercials or character work and keep wondering about dubbing: the job of replacing an actor’s voice on screen, in another language, so the audience forgets they’re watching a translation. It’s one of the few areas of voice work that’s growing because of streaming rather than in spite of it, and it asks for a very particular mix of skills.<\/p>\n

The good news is that most of those skills can be learned at home. The less good news is that nobody can teach you sync by describing it. You have to watch mouths, a lot of them, and practise until you can feel a line landing in the right place before the engineer tells you it did. Below is what the work involves, what the people hiring for it say they want, and a way to start practising this week.<\/p>\n

Dubbing is acting to a picture that already exists<\/h2>\n

In most voice work, you create the performance and everyone else fits around you. The animator draws to your read, the editor cuts to your timing, the music ducks under you. Dubbing flips that. The performance already exists, on screen, with a face, a body and a set of breaths you didn’t choose. Your job is to become that person in a new language without anyone noticing the join.<\/p>\n

Netflix, which publishes its dubbing guidelines for partner studios on its public help centre, describes the balance better than most. Its guiding principles say the dubbing actor’s work is “a balancing act between authentically embodying the onscreen character from within (through an empathetic understanding of the character’s motivations and backstory) and rigorously observing the onscreen physical behavior of the character from without, including but not limited to lip sync.”<\/p>\n

That’s the whole job in one sentence. Inside, you’re acting: you know why this person is angry, what they want from the woman across the table, why they hesitate before the last word. Outside, you’re a precision instrument, hitting the first syllable when the lips part and finishing when they close.<\/p>\n

If you’ve done character work for animation, some of this will feel familiar. Our guide to building a character voice from the person outwards<\/a> covers the inside half. Dubbing adds the outside half, and it’s the outside half that separates people who get called back from people who don’t.<\/p>\n

Why the work is there<\/h2>\n

Streaming made every country’s shows available everywhere at once, and plenty of viewers would rather listen than read. In a 2024 article on dubbing Korean shows, Netflix reported that “Over 40% of all viewing for branded Korean unscripted series on Netflix is dubbed,” and that regions including Brazil, Mexico and parts of Europe show “a strong preference for dubbing over subtitles.” It put that preference down to “family viewing dynamics, an aging population, and differences in readability by language and market practice.”<\/p>\n

The same piece quotes the company’s senior director of dubbing, Catherine Retat: “Dubbing is like a second production.” That line matters for you as an actor, because it tells you how the work is being treated. It’s cast, directed and mixed like the original, not rushed out as an afterthought. So it’s cast on acting ability first.<\/p>\n

What a dubbing session actually looks like<\/h2>\n

Most dubbing is recorded in short pieces, often called loops. A loop is one line or a few lines of a single character. You stand in the booth with headphones on and a screen in front of you. The engineer plays the clip with the original audio a couple of times so you can hear the rhythm, pitch and breaths. Then they play it again, usually with the original muted or low in your ears, and you record your line over the picture. You do it again. And again, until the director is happy with both the acting and the fit.<\/p>\n

The script you’re reading from has already been translated and then adapted. Adaptation is its own craft: a writer reworks the translation so it means the same thing, sounds natural in the new language and fits the mouth movements on screen. By the time the page reaches you, a lot of the sync problems should be solved. Not all of them, though, and a good dubbing actor spots a line that can’t work and says so politely, rather than mangling it take after take.<\/p>\n

The mic is often a shotgun, not the large condenser you’d use for commercials. Netflix’s guidelines for English-language films and series say it “strongly” encourages shotgun microphones for live-action lip sync, because “The ideal is to match the sound of the original recordings onset.” The original actors were recorded on a film set with a boom mic overhead, and the dub needs to sit in the same acoustic world. The same guidelines encourage “dubbing actors to be able to physically move in the booth, in accordance with the onscreen performance (as long as this does not compromise recording quality).”<\/p>\n

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Reading the mouth: flaps, labials and open shapes<\/h2>\n

Sync isn’t about matching the length of a line. It’s about matching the shapes. Netflix’s guiding principles list what it calls the fundamental criteria for lip sync in the scenes that matter most, and they read like a checklist you can train your eye on.<\/p>\n

Flaps.<\/strong> Every time the mouth opens and closes is a flap. The guidance is blunt: “Make sure to account for every flap, especially during longer lines.” If the on-screen actor’s mouth moves six times and your line only has four beats in it, the audience sees two moments where the lips move and nothing comes out.<\/p>\n

Labials.<\/strong> These are the sounds where the lips fully close. In English that’s m, b and p, plus w, which Netflix treats as “a unique shape” that should be “the exception rather than the rule for a labial.” The instruction here is simple and strict: “Do not ignore labials at any point in the line.” A closed mouth on screen with an open vowel coming out is the single most obvious dubbing error there is.<\/p>\n

Semi-labials.<\/strong> F and v bring the top teeth to the bottom lip but don’t close the mouth. The guidelines warn not to swap a full closure for one of these “unless the mouth is obscured,” because a viewer can see the difference even if they couldn’t name it.<\/p>\n

Open shapes.<\/strong> Vowels aren’t all the same. A wide “ah” looks nothing like a rounded “oo.” The adaptation should put the right kind of open sound where the actor’s mouth is open, and your job is to deliver it without flattening it.<\/p>\n

Starts and ends.<\/strong> The line should begin when the lips part and finish when they close. The English-language guidelines put it plainly: “Dialogues should start when the on-screen actors move\/open their mouths, and should end when their mouths close.”<\/p>\n

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Intent beats perfect sync<\/h2>\n

Here’s the part that surprises people who come to dubbing from a technical background. Perfect sync isn’t the top priority. Netflix’s English-language guidelines say perfect lip sync is something partners should “constantly pursue,” but add: “we don’t want to sacrifice the message and intention of the OV by prioritizing perfect lip-sync. The original intent of the dialogue is our priority.”<\/p>\n

OV means original version. In practice, that means a take with the right feeling and slightly soft sync often beats a take that’s frame-perfect and dead. Directors will trade a flap for a real laugh. What they won’t trade is the emotion of the scene.<\/p>\n

The same logic applies to casting. You might assume a dubbing director is hunting for a sound-alike of the on-screen star. Sometimes they are, but the guiding principles say “a voice match cannot be prioritized above performance, unless a certain vocal quality is specific to a character trait.” Pitch and texture vary so much between languages that a close vocal copy can still feel wrong. A voice in the right range, playing the scene truthfully, usually wins.<\/p>\n

Breaths, efforts and the sounds between words<\/h2>\n

Beginners tend to treat the non-verbal parts of a scene as optional. They aren’t. The guiding principles describe exceptional lip sync as “not only accurately matching mouth movements but also embodying the energy, dynamics, volume, and voice projection of the original performance, with close attention to breaths and efforts.”<\/p>\n

Efforts are the grunts, gasps, sighs and exertions that go with physical action: lifting a box, getting punched, climbing stairs, crying. If the actor on screen inhales sharply before a line, you inhale sharply before your line. If they’re out of breath, you’re out of breath. If you’ve read our piece on where the air goes before the words<\/a>, this is the same control, used to copy someone else’s breathing rather than hide your own.<\/p>\n

Volume matters too, and not in the way you’d expect. The English guidelines note that it’s “okay to have less than perfect enunciation when recording action\/intense sequences or to have a muted projection in quiet, intimate scenes.” Voice actors trained on commercial and narration work often over-articulate in dubbing, and it sounds like a voice-over laid on top of a film rather than a person in the room. Match the energy on screen, even when that means mumbling a little.<\/p>\n

Live action and animation are different jobs<\/h2>\n

Animated dubbing and live-action dubbing share the same principles but feel very different in the booth. With animation, the mouths are drawn, often simplified, and sometimes loosely timed to the original language. There’s more room to breathe, and the performance can be bigger. The recording set-up is usually closer to a familiar voice-over studio, because animated originals are recorded in a booth rather than on a set.<\/p>\n

Live action is harder to fake. Real faces show every closure, every jaw movement and every swallow, and audiences have spent their whole lives reading real faces. It’s also where the physical side matters most, because a body that’s still while the on-screen actor is running shows up in the voice.<\/p>\n

Anime sits somewhere between. The mouth movement is simple, but fans know the original performances well and notice when the energy is off. If you’re drawn to games as well, our guide to what video game voice work really asks for<\/a> covers a lot of the same stamina and effort-sound territory.<\/p>\n

A home practice routine that actually builds sync<\/h2>\n

You don’t need a dubbing studio to start. You need a screen, headphones, a way to record and the discipline to be honest about the results.<\/p>\n

Pick short scenes with clear faces.<\/strong> Choose a film or series in a language you don’t speak, with close-ups and dialogue scenes rather than action. Two people talking at a table is ideal. Grab a clip of ten to twenty seconds.<\/p>\n

Transcribe the flaps before you write a word.<\/strong> Watch the clip with the sound off and count mouth openings for each line. Note where the lips close fully. Mark where each line starts and ends. This is dull and it’s the most valuable part of the exercise, because it trains your eye to see what an audience sees.<\/p>\n

Write your own line to fit.<\/strong> Using subtitles for the meaning, write an English line that says the same thing, with labials landing on closures and the same number of beats. You’ll find out fast why adaptation is a profession.<\/p>\n

Record over the picture.<\/strong> Most free editing software lets you play video while recording a track. Mute the original, play the clip, and speak your line as the actor. Then watch it back with your voice laid over the picture. The first attempts will look like a badly dubbed kung fu film. That’s normal.<\/p>\n

Now forget the sync and act.<\/strong> Once the timing sits roughly right, do three more takes concentrating only on why the character is saying this. Compare them. Usually the best-acted take also has the best sync, because real intention brings the natural rhythm with it.<\/p>\n

Copy the breaths.<\/strong> Go back through the clip and mark every audible breath, laugh and effort. Put them into your next take. It’s surprising how much more believable a dub becomes with nothing changed but the breathing.<\/p>\n

Getting your first dubbing work<\/h2>\n

Dubbing is still largely a studio business, and most of it is cast by the studios that do the recording. The people who get in tend to have three things: acting training, a clean, adaptable voice, and a reel that proves they can hit sync.<\/p>\n

For the reel, use your home practice. Cut together four or five of your best clips, showing a range of scenes: something quiet, something angry, something funny, maybe an animated character. Keep the whole thing under two minutes. Show the picture with your voice over it, because the point is to prove the fit, not just the sound.<\/p>\n

If you’re bilingual, you have a real advantage. Many dubs are cast locally in the target language, and native speakers who can also act and sync are in demand. Our older piece on choosing between dubbing and other voice acting<\/a> talks through how the two careers can sit side by side. Plenty of actors do both: dubbing days in a studio, commercial and narration work from a home booth. You can see the kind of home-recorded work clients post on our voice over jobs board<\/a>.<\/p>\n

When you do get into a studio, the etiquette is simple. Arrive warmed up, because loops come fast and there’s no time to find your voice on the clock. Take direction without arguing. Flag a line that can’t sync once, clearly, then let the director decide. Keep your hands and clothes quiet. And never look at the script when the picture is running, if you can help it; the answer is always on the actor’s face, not on the page.<\/p>\n

The short version<\/h2>\n

Dubbing is acting to a performance that already exists. Play the person from the inside and watch their body from the outside. Count flaps, respect every closure, start when the lips part and stop when they close. Copy the breaths and efforts. Match the energy of the scene, even when that means mumbling. And when sync and feeling pull in different directions, the people who commission dubs have told everyone in writing which one wins: the feeling.<\/p>\n

Sources: Netflix Partner Help Center, “Dubbing Guiding Principles”<\/a> and “Dubbing Creative Guidelines, Films & Series (English)”<\/a>; About Netflix, “How Netflix Dubbing Connects the World to K-Content”<\/a> (June 2024).<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

What dubbing voice work asks of you: counting flaps, hitting every lip closure, copying breaths, and why the feeling on screen beats perfect sync.<\/p>\n","protected":false},"author":5,"featured_media":6027,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[235,36,504],"tags":[583,402,581,582,74,61],"class_list":["post-6026","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-voice-acting-voice-actor-2","category-voice-over-industry","category-voice-over-tips","tag-adr","tag-dubbing","tag-dubbing-voice-acting","tag-lip-sync","tag-voice-acting","tag-voice-over-jobs"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t