Explainer Video Voiceover: How to Cast & Brief a VO
In an animated explainer, the voiceover does a lot of the persuading. The visuals show the idea; the voice decides whether it sounds like a company you’d trust.
This guide covers how to choose the right explainer video voiceover for your audience, how accents and languages change the job, how long your script will run once it’s spoken, a copyable VO brief, and the mistakes that make a good film sound wrong. It assumes you have a script. If not, start with how to write a video script.
How to choose an explainer video voiceover
Cast the voice for your audience and the job the video does, not for "a nice voice". Decide the tone in three words, the accent and language your buyers expect, and a pace the visuals can keep up with. Then brief the artist with a locked script, a pronunciation guide and a timing target.
Everything else on this page is detail on those decisions.
Why the voice matters so much in animation
Animation has no sound of its own. There’s no camera picking up a presenter, so every word the viewer hears is a choice. The voice carries the tone of your brand, sets the pace of the film and signals who the video is for, often before the viewer has registered a single visual.
That’s why a mismatched voice is so noticeable. A breezy, upbeat read over a medical device film feels flippant. A grave, slow read over a consumer app feels like an apology. Neither is a bad voice. Each is the wrong one for that job.
What to decide before you cast
| Decision | Questions to answer | Example answer |
| Tone | Which three words should the viewer feel? | Calm, credible, warm |
| Accent | What will your buyers find natural and easy to follow? | Neutral British English for a UK and Ireland launch |
| Language | Which markets need their own version? | English master, German version for DACH |
| Age and register | Peer, expert, guide or friend? | A peer: sounds like the buyer’s colleague |
| Pace | Does the film need breathing room or energy? | Unhurried; the visuals carry detail |
| Voice type | Which voice suits the audience and brand? | Decide for the audience, then audition more than one option |
There’s no rule that a certain voice type sounds more expert or trustworthy for every audience. Decide for your viewers and your brand, and audition two or three different voices against the same lines before you commit.
Casting by type of explainer
Different jobs call for different reads. Here’s how we think about it for the most common explainer types.
| Explainer type | What the voice needs | Watch out for |
| Medical and healthcare | Calm, clear, reassuring; precise on terminology | Sounding cold or rushed through clinical terms |
| SaaS and B2B tech | Confident, conversational, like a knowledgeable peer | Sounding like an advert or a keynote |
| Finance and insurance | Steady and credible, warm enough to feel human | Over-formality; jargon read without emphasis |
| Consumer apps and products | Friendly, energetic, natural | Shouting enthusiasm; “radio voice” |
| Training and onboarding | Patient, clear, easy to follow at length | Monotone over longer films |
| Educational and edutainment | Curious, lively, authoritative without lecturing | Too much performance for the content |
For medical films in particular, the read has to make complex information feel manageable. We cover that wider brief on our medical animation videos page.
Accents and languages
Accent is about what feels natural to your viewers. A neutral accent travels further; a regional one can make a local or community message feel genuine. What matters is that your audience follows every word without effort and feels the video is meant for them.
For other markets, use a native speaker for each language, not a second-language read of the English. And expect more than the voice to change:
- Runtime changes. Translated scripts rarely run the same length as the original. Our Fertilily film runs 1:40 in English and 1:48 in German.
- On-screen text changes. Labels, captions and end cards need translating too, and longer words need room in the layout.
- Timing needs re-syncing. Animations hit on specific words, and those words move when the language changes.
- Pronunciation needs checking. Product names, acronyms and place names should be confirmed with a native reviewer.
Here are both versions. Same story, two markets.
Planning languages from the start is cheaper than retrofitting them. If you know a film will travel, tell us at the brief stage so the layout leaves room for longer text.
How long will your voiceover run?
The National Center for Voice and Speech puts the average rate of speech for US English speakers at about 150 words per minute. Explainer voiceovers usually run a little slower so the visuals can land, and pauses for key moments add time.
| Script length (voiceover words) | Runtime at ~150 wpm | Typical use |
| About 75 words | About 30 seconds | Social ads and cut-downs. See 30-second explainer videos |
| About 150 words | About 60 seconds | Homepage and landing-page explainers |
| About 225 words | About 90 seconds | Product pages and B2B stories with a proof point |
| About 300 words | About 2 minutes | Warm or technical audiences |
Count the voiceover column only, not the scene directions. If the read feels rushed, cut words rather than asking the artist to speed up. For choosing the runtime itself, see how long an explainer video should be.
How to brief a voiceover artist
- Lock the script. Every change after recording means a new session. Get final sign-off from everyone who needs to approve the words.
- Write three tone words. “Calm, credible, warm” gives an artist far more to work with than “professional”.
- Add a pronunciation guide. Spell out product names, acronyms, people’s names and anything technical, phonetically if needed.
- Give context, not just lines. Who’s watching, where the video will play and what they should do after watching.
- Set a timing target. “This read should land at about 60 seconds” stops the session from drifting.
- Mark the key moments. Bold or underline the words that need emphasis, and note any pause the animation depends on.
- Share a reference. A film or read whose tone you like, with a line on what you like about it.
- Confirm usage up front. Where and for how long the recording will be used, including paid ads, broadcast or extra languages.
A copyable voiceover brief
| Field | What to write |
| Project and video | Product name, video title, runtime target |
| Audience | Who’s watching and what they already know |
| Where it plays | Homepage, sales emails, LinkedIn ads, trade show (with or without sound) |
| Tone in three words | e.g. calm, credible, warm |
| Accent and language | e.g. neutral British English; German version to follow |
| Pace | e.g. unhurried, about 140 wpm, pauses after each step |
| Pronunciation guide | Each tricky word, spelt phonetically |
| Emphasis and pauses | Marked in the script |
| Reference | A link or a description of a read you like |
| Usage | Channels, territories, duration, paid media |
| Deliverables | File format, separate takes per line or one continuous read, any pickups |
Recording and direction
There are two common ways to record. In a directed session, someone from the production team (and sometimes the client) listens live and asks for adjustments line by line. In a self-directed recording, the artist works from the brief and sends takes back for review. Directed sessions catch tone problems in the moment; self-directed works well when the brief is precise.
Either way, the voiceover is recorded against the locked script and before the final animation, so the animators can time movement to the words. Small fixes afterwards are called pickups: a re-recorded line or a corrected pronunciation. Keep them few by getting the brief right first.
Human or AI voiceover?
AI voices are useful for rough drafts and internal timing checks. You can hear a script out loud before anyone books a session. For a finished film that represents your brand, we keep the voiceover human. A good artist reads intent, not just words: where to lean in, where to pause, how to make a complex line sound simple. That’s hard to direct in a synthetic voice, and it’s what makes the difference between a film people follow and one they tolerate.
Whatever you use, check the rights. A human recording or a synthetic one should come with clear written terms for where and how long you can use it.
Usage rights and licensing
Voiceover fees and terms often depend on use. Before recording, agree in writing:
- Channels. Website and social only, or also paid ads, broadcast, events or apps?
- Territories. One country, a region or worldwide?
- Duration. A fixed period or in perpetuity?
- Edits and cut-downs. Can the recording be re-cut for 30- and 15-second versions?
- Languages. Each language is usually a separate recording and a separate agreement.
Getting this right up front avoids an awkward conversation when the video does well and you want to put money behind it.
How we cast voiceover at Animation Explainers
Voiceover comes after the script and storyboard are signed off. We cast against the locked script and your audience brief, record before final animation so the visuals can be timed to the read, and share the voice for sign-off, as at every major stage. Extra languages mean extra voiceover sessions and usually translated on-screen text too, so we plan them in from the brief. For how the visuals are planned before the voice is recorded, see our explainer video storyboard guide; for the whole journey, the explainer video guide.
Voiceover mistakes we fix most often
- Recording an unlocked script. One changed sentence can mean a new session and re-timed animation.
- Choosing a voice because it "sounds nice". It has to suit the audience and the brand.
- No pronunciation guide. The product name read three different ways in one film.
- Too many words for the runtime. A rushed read is harder to follow than a shorter story.
- Music fighting the voice. The mix should leave the words clear, especially on phone speakers.
- Forgetting the mute viewer. Many people watch with the sound off, so captions and on-screen text still need to carry the story.
- Unclear usage rights. Find out before the paid campaign, not after.
What does an explainer voiceover cost?
In a studio project, professional voiceover casting and recording are part of the production, not a separate purchase. What moves the cost is mostly scope: the number of languages, how the recording will be used and how many versions you need.
Studio projects at Animation Explainers typically sit in the $6,000 to $35,000 and beyond band. Length, style, custom assets, revisions and languages move a quote more than any single line item. For the full breakdown, read how much an explainer video costs, or see how we work as an explainer video production studio.
Soft next steps
Not sure what your film should sound like? Send us the script and tell us who’s watching. Browse our portfolio to hear voices across sectors and languages, or contact us and book a meeting from that page.
FAQ
How do I choose a voiceover for an explainer video?
Start with the audience and the job, not the voice. Pick three tone words, the accent and language your buyers expect, and a pace the visuals can keep up with. Then audition two or three voices on the same lines from your locked script and choose the one your audience will follow most easily.
Should my explainer voiceover be male or female?
There’s no rule that one sounds more credible for every audience. Choose for your viewers and your brand, and audition more than one option on the same lines. Many brands decide on tone, accent and pace first, and find the voice type follows from those.
What accent should I use for my explainer video?
The one your audience finds natural and easy to follow. A neutral accent travels widely; a regional one can make a local message feel genuine. For other markets, use a native speaker for each language and have a native reviewer check pronunciation of product names and terms.
How long does a voiceover script run?
About 150 words per minute is the average US English speech rate, and explainer reads usually run a little slower. Plan about 75 words for 30 seconds, 150 for 60 seconds, 225 for 90 seconds and 300 for two minutes. Count the voiceover lines only, not the scene directions.
What should a voiceover brief include?
The locked script, three tone words, accent and language, a pronunciation guide, a timing target, the audience and where the video will play, marked emphasis and pauses, a reference read and the usage terms. The clearer the brief, the fewer pickups you’ll need after the session.
Can I use an AI voice for my explainer video?
AI voices are handy for drafts and timing checks. For a finished film that represents your brand, we recommend a human voiceover: a good artist interprets the script, knows where to pause and makes complex lines sound simple. Whatever you use, get the usage rights in writing.
Can I add other languages to my explainer later?
Yes, but it’s smoother if you plan for it at the brief stage. Each language needs a native voiceover, translated on-screen text and re-timed animation, and translated scripts rarely run the same length. Our Fertilily film runs 1:40 in English and 1:48 in German.
Is voiceover included when Animation Explainers makes a video?
Yes. Voiceover casting and recording are part of a studio project. We cast against your locked script and audience brief, record before final animation and share the voice for sign-off. Extra languages are scoped as extra voiceover sessions. See our explainer video cost guide.
How do I choose a voiceover for an explainer video?
Start with the audience and the job, not the voice. Pick three tone words, the accent and language your buyers expect, and a pace the visuals can keep up with. Then audition two or three voices on the same lines from your locked script and choose the one your audience will follow most easily.
Should my explainer voiceover be male or female?
There’s no rule that one sounds more credible for every audience. Choose for your viewers and your brand, and audition more than one option on the same lines. Many brands decide on tone, accent and pace first, and find the voice type follows from those.
What accent should I use for my explainer video?
The one your audience finds natural and easy to follow. A neutral accent travels widely; a regional one can make a local message feel genuine. For other markets, use a native speaker for each language and have a native reviewer check pronunciation of product names and terms.
How long does a voiceover script run?
About 150 words per minute is the average US English speech rate, and explainer reads usually run a little slower. Plan about 75 words for 30 seconds, 150 for 60 seconds, 225 for 90 seconds and 300 for two minutes. Count the voiceover lines only, not the scene directions.
What should a voiceover brief include?
The locked script, three tone words, accent and language, a pronunciation guide, a timing target, the audience and where the video will play, marked emphasis and pauses, a reference read and the usage terms. The clearer the brief, the fewer pickups you’ll need after the session.
Can I use an AI voice for my explainer video?
AI voices are handy for drafts and timing checks. For a finished film that represents your brand, we recommend a human voiceover: a good artist interprets the script, knows where to pause and makes complex lines sound simple. Whatever you use, get the usage rights in writing.
Can I add other languages to my explainer later?
Yes, but it’s smoother if you plan for it at the brief stage. Each language needs a native voiceover, translated on-screen text and re-timed animation, and translated scripts rarely run the same length. Our Fertilily film runs 1:40 in English and 1:48 in German.
Is voiceover included when Animation Explainers makes a video?
Yes. Voiceover casting and recording are part of a studio project. We cast against your locked script and audience brief, record before final animation and share the voice for sign-off. Extra languages are scoped as extra voiceover sessions. See our explainer video cost guide.
