On this page 9
- What you need before you start
- Step 1: Write the script for the ear, not the eye
- Step 2: Choose a tool and a voice
- Step 3: Set pronunciation and pacing
- Step 4: Generate in sections and review
- Step 5: Sync the voiceover with your video
- Step 6: Export and check the final file
- Step 7: Check rights, consent and disclosure before you publish
- How to fix a robotic-sounding AI voiceover
The short answer
To make an AI voiceover for a video, write a script meant to be heard, then pick a tool and a voice. Fix pronunciation and pacing on a short test, and generate the audio scene by scene. Finish by syncing the audio in your editor, exporting, and checking that your plan and the platform allow what you're publishing.
- Write for the ear: short sentences, with numbers and URLs spelled the way they're said.
- Test pronunciation first on one paragraph that contains your trickiest words.
- Generate in sections so a bad line costs you one clip, not the whole track.
- Check plan rights before publishing, especially for ads and client work.
What you need before you start
Treat a voiceover as a small production job. Gather four things first and the later steps run smoothly.
- A rough cut or a shot list. You need to know roughly how long each part of the video runs, so the script can fit it.
- A draft script. An AI writing assistant can help you draft or shorten it, but a person should edit it. If you haven't picked one yet, see how to choose an AI writing assistant.
- An AI voice tool. This can be a dedicated AI voice generator or the text-to-speech (TTS) built into your video editor. Step 2 helps you choose.
- Ten quiet minutes. Use them to read the script aloud yourself.
Step 1: Write the script for the ear, not the eye
Copy written for a web page or a brochure sounds stiff when spoken. A reader can go back over a long sentence, but a listener can't. An AI voice also reads exactly what you give it, so every written shortcut can turn into a stumble.
Rewrite the script with these rules:
- One idea per sentence. Keep sentences short and put the key word at the end, where the voice naturally lands.
- Talk like a person. Use contractions and everyday words. Be clear about who is speaking to whom: "we" for your business, "you" for the viewer.
- Write things as they're said. Spell out numbers, dates, prices, URLs and abbreviations: "twenty twenty-six", "example dot com", "nine to five".
- Split by scene. Break the script into blocks that match the scenes, and mark where a visual needs a pause, for example "[PAUSE: product close-up]". Remove these notes before you paste the text into the tool, or the voice may read them aloud.
- Time it with a stopwatch. Read each block aloud at a natural pace and compare it with the scene. Don't rely on a words-per-minute rule. Cut until the block fits.
Start from copy you already have
Product videos often start from existing product copy. Our guide to writing product descriptions with AI covers that step. To pick a chatbot for drafting or trimming, compare ChatGPT, Claude and Gemini for small business writing.
Keep confidential client or customer details out of anything you paste into an AI tool. This guide explains what's safe to share.
Step 2: Choose a tool and a voice
You have two broad options. Dedicated AI voice generators, such as ElevenLabs or Murf, focus on voice and usually give you more voices and more control. Many video editors also include built-in text-to-speech voices, which keep everything in one place.
| Option | Best for | Control over delivery | Pronunciation tools | Licensing to check |
|---|---|---|---|---|
| Dedicated AI voice generator | Brand, client and longer videos | Usually more: speed, style, stability | Often respelling, dictionaries or markup, depending on the tool | Which plan allows commercial use; cloning rules |
| Built-in editor text-to-speech | Quick social clips and drafts | Usually basic: voice and speed | Often limited; respelling still works | The editor's terms for TTS output in ads and client work |
Features, voice libraries and limits vary by plan and change often. Check the vendor's current plan page before you commit.
How to pick a voice
- Match the audience and the brand tone. A calm, warm voice suits a how-to; a brisker one suits a promo. If you have a brand voice guide, use its tone words as your brief.
- Audition with the same lines. Paste the same 2–3 sentences into several voices and compare them side by side. Include one brand name and one number.
- Avoid sound-alikes. Skip any voice that sounds like a recognisable real person. It can confuse viewers and may create legal risk.
Built-in voice or dedicated tool?
- Quick social clip with no tricky namesthe built-in voice in your editor is usually enough.
- Brand names, product terms or client worka dedicated tool with pronunciation controls and clear commercial terms.
- A series or longer explainersa dedicated tool, so you can reuse the same voice, settings and pronunciation list.
- Your own voice at scalevoice cloning, but only of your own voice (or of someone with documented consent), on a plan that allows it.
Step 3: Set pronunciation and pacing
Fix names, jargon and rhythm before you generate the full script. It's quicker and cheaper than fixing each clip later.
Pronunciation
If the voice mangles a brand, product or place name, respell it the way it sounds. For example, a café called "Caoimhe's" might need to be typed as "Keeva's". Keep these respellings in a shared document so every video uses the same ones.
Some tools also offer pronunciation dictionaries, aliases or markup such as SSML. Check whether yours does.
Pacing and settings
Punctuation is your main control:
- Commas give short pauses.
- Full stops give longer pauses.
- Line breaks separate ideas.
- Ellipses and dashes behave differently between tools, so test them before relying on them.
Speed, stability and style (or expressiveness) sliders can help, but use them sparingly. Small changes are safer. Big jumps can make a voice sound unstable or over-acted.
Step 4: Generate in sections and review
Generate the audio scene by scene instead of running the whole script at once. If one line goes wrong, you regenerate one short clip instead of the entire track.
Then review properly:
- Listen with headphones. Note mispronunciations, strange emphasis, rushed endings and uneven volume between clips.
- Fix the cause, then regenerate. Rephrase or respell only the problem lines, and regenerate just those clips.
- Name files clearly. Use numbered names that match the script blocks: 01_intro, 02_problem, 03_solution. This makes syncing much faster.
Depending on the tool and plan, each generation may count against a monthly character or credit allowance. Fix the script first and regenerate second. Regenerating the same line over and over in the hope of a better take uses up your allowance quickly.
Step 5: Sync the voiceover with your video
- Import the clips. Bring the numbered audio files into your editor and place them on their own audio track.
- Decide what leads. Either cut the video to fit the voice, which is easier for explainers, or trim the voice to fit fixed footage such as product shots or screen recordings.
- Leave breathing room. Add small gaps for visuals and transitions. Nudge clips into place rather than speeding the voice up a lot.
- Add music underneath. Put music on a separate track and lower it while the voice plays (this is often called ducking). Many editors can do this automatically.
- Add captions. Many viewers watch with the sound off. Auto-captions save time but need a proofread, especially for names and numbers.
- Watch it through. Play the whole video once, start to finish, without stopping. Note anything that jars, then fix it.
If the video is going to social channels, our weekly workflow for social media posts covers the caption copy and posting side.
If the voice is too long or too short for a scene
- Too long: cut words from the script first. Only then consider a small speed change in the voice tool.
- Too short: add a pause, hold the shot a little longer, or add a short line.
- Avoid heavy stretching or compressing of the audio in the editor. It can make the voice sound unnatural.
Step 6: Export and check the final file
- Export the voice in the best quality available. Many tools offer WAV or high-quality MP3, depending on the tool and plan. Use the highest quality you have for the edit.
- Export the video for its destination. Use the format and aspect ratio the target platform recommends, such as vertical video for short-form feeds. Check the platform's help pages for current specs.
- Test on two kinds of speakers. Play the export on a phone speaker and on headphones. Check that the voice is clear over the music and that the volume stays consistent from scene to scene.
- Keep a record. Save the script, the audio files and a short note of the tool, plan and date you used. If anyone asks about rights later, you'll have the answer.
Step 7: Check rights, consent and disclosure before you publish
This step is what makes the voiceover safe to use for your business. It takes a few minutes and heads off the problems that are hardest to fix after publishing.
Commercial use depends on your plan
Built-in editor voices have their own terms too. Read the licence or terms section before you use them in ads or client work.
Voice cloning needs documented consent
Only clone your own voice, or the voice of someone who has given clear, written consent for that specific use. Follow the tool's own cloning rules as well. Laws differ between countries, so get professional advice for anything sensitive, such as continuing to use a voice after someone leaves the business.
Disclosure on the platforms you publish on
Some platforms ask creators to label realistic AI-generated or altered content. YouTube and TikTok, for example, both have policies on this. The rules differ between platforms and change over time, so check the current help pages of each platform you publish on.
Even where no label is required, a short note can help customers trust you. If several people make videos, write these rules into your team's AI acceptable use policy.
Pre-publish checklist
- Your plan allows commercial use of the voice, checked on the vendor's current page.
- Consent is documented for any cloned voice.
- The platform's AI disclosure rules are checked, and a label is added if needed.
- Captions are proofread, especially names and numbers.
- The script, audio files, tool, plan and date are saved together.
How to fix a robotic-sounding AI voiceover
Robotic delivery often comes from the text rather than the voice. Work through this table before you change tools.
| Symptom | Likely cause | Fix |
|---|---|---|
| Monotone, flat delivery | Long sentences with the same structure | Split them, vary sentence length, add a question |
| Rushed, breathless delivery | Missing punctuation | Add commas, full stops and line breaks |
| Wrong stress or mispronounced words | The tool is guessing from the spelling | Respell phonetically or add the word to a pronunciation dictionary |
| Odd emphasis on numbers or abbreviations | Written as symbols, like "24/7" or "Q3" | Write them out as they're spoken |
| Sounds over-acted | Style or expressiveness set too high | Lower the setting and regenerate one test line |
| Clips don't match each other | Voice or settings changed between clips | Keep the same voice and settings for the whole video |
If one voice keeps struggling with your script, try a different voice before rewriting everything. Voices can differ in how they handle a given style of text, so a quick audition with your test paragraph is often the fastest fix.
Frequently asked questions
Can I use an AI voiceover in a commercial video for free?
It depends on the tool and the plan. For example, ElevenLabs' Free plan does not list a commercial licence while the Starter plan does (checked 2026-11-02 on elevenlabs.io/pricing). Terms change, so always check the current plan page before using a voice in ads or client work.
Is it legal to clone someone's voice with AI?
Only clone your own voice or the voice of someone who has given clear, documented consent, and follow the tool's own cloning rules. Laws vary by country, so get professional advice for anything sensitive. Never clone a public figure or anyone who hasn't given permission.
Do I have to say a video uses an AI voice?
Some platforms ask creators to disclose realistic AI-generated or altered content, and the rules differ by platform and change over time. Check the current policy of each platform where you publish. Even when it isn't required, disclosure can help build trust with customers.
How do I make an AI voice sound less robotic?
Write shorter sentences, use punctuation to control pauses, spell difficult words phonetically and keep style settings moderate. The troubleshooting table in this guide matches common symptoms to their likely causes and fixes.
How long does it take to make an AI voiceover for a short video?
There's no fixed figure, because it depends on the script, the tool and how many fixes you need. Most of the time goes into writing the script and reviewing the audio, not the generation itself. A reusable pronunciation list and a script template make later videos faster.
Should I use my video editor's built-in voices or a dedicated AI voice tool?
Built-in voices are convenient for quick social clips with no tricky names. Dedicated tools usually offer more voices and more control over delivery and pronunciation, which matters for brand names and client work. The decision block in Step 2 helps you match the option to your situation.
Can I make an AI voiceover in another language?
Many tools offer several languages, but quality and pronunciation vary between languages and voices. Have a native speaker check both the script and the final audio before you publish.