How to add an AI voiceover to a video

To add an AI voiceover to a video, upload the video, get a script, pick a voice, and export. With ScreenDub the script part is handled for you: it watches what happens on screen, writes the narration to match, and voices it in a studio-grade AI voice. You never record audio, nothing gets installed, and you can ship the same video in any of 70+ languages. This guide walks through the full workflow, a worked example, how to write lines that sound natural, the mistakes that make a voiceover sound off, and how using an AI voice compares to recording your own.

Why use an AI voiceover instead of recording your own

Recording your own narration sounds simple until you try it. You need a quiet room, a decent microphone, and the patience to redo a line every time you stumble or the fridge hums. One change to the product later, and you are back at the microphone re-recording the whole thing to keep the audio consistent. An AI voiceover removes that entire loop.

The audio comes out clean and even. There is no room echo, no clipping, and no gap in volume between one line and the next. Because the voice is generated from text, the tone stays identical across every video you make, which matters when you are building a set of demos or tutorials rather than a single clip. A viewer who watches five of your videos should hear the same voice and the same pace in every one. Edits are the real win: when a screen or a feature name changes, you fix the sentence and regenerate, instead of setting up to record again. And you do not need a microphone at all. If you would still rather use your own voice, that option is there too, but for most videos the AI voice is faster and more consistent.

What you need

• A free account. No credit card is needed to start.
• The video as an MP4, WebM, or MOV. A silent screen recording is the ideal source.
• A recent version of Chrome or Edge, since the whole flow runs in the browser.
• Optionally, notes on tone and terms: how formal to sound, and how product names should be said.

How to add an AI voiceover, step by step

1. Bring the video. Record your screen in the browser, or upload footage you already have as an MP4, WebM, or MOV. Silent recordings are fine; that is the normal starting point, and it means you never have to narrate while you click.
2. Let the script draft itself. ScreenDub analyzes the video and writes narration matched to what happens on screen, in the style you pick. A demo can sound persuasive and a tutorial can sound calm and instructional, so you start from a real draft instead of a blank page.
3. Edit the lines that need you. The script is editable line by line. Fix the wording, lock the product names so they are always said the same way, and cut anything that only states the obvious. The first edit on each step is free, so small fixes do not eat into your minutes. Editing text is the whole trick: there is no take to re-record and no waveform to slice.
4. Pick the voice. Choose from studio-grade voices in many accents and tones, preview the one you like against the footage, and swap it if the tone does not fit. The narration stays synced to the on-screen action while you audition voices.
5. Export. Render a finished MP4 with the voiceover baked in, plus captions, chapters, and a step-by-step PDF guide built from the same recording. Background music is available if the video feels too quiet on its own.

A worked example: voicing a silent two-minute recording

Say you have a two-minute silent screen recording of a new feature, captured in one clean pass with no audio. You want it narrated and ready to publish. Here is how it comes together.

1. Upload the MP4. ScreenDub watches the recording, splits it into steps, and drafts a narration line for each moment on screen, timed to land as each action happens.
2. Read the draft against the footage. Most lines are close. You rewrite two of them to use your real feature names, and you delete one line that only says what the button already shows.
3. Pick a calm, clear voice and preview it on the actual video. The pace fits, so you keep it. If it had felt too flat, you would swap to another voice and preview again.
4. Export. You get a finished MP4 with the narration baked in, captions for muted viewers, chapters so people can jump to the step they want, and a PDF guide for anyone who would rather read than watch.

The whole thing takes minutes, and you never touched a microphone. The result is a finished, narrated MP4 plus a matching PDF guide, made in the time it used to take just to write the script. The same recipe scales to any silent recording you have sitting in a folder, whether it is a demo, a tutorial, or a walkthrough for your team.

How to write a voiceover script that sounds natural

• Write for the ear, not the eye. Short sentences read better aloud. If a line feels long in text, it will feel longer spoken. Break it in two.
• Match the words to the action. The narration should describe what is on screen at that moment. A recording-first workflow lines this up for you, so keep it that way when you edit.
• Say what the viewer cannot see. The viewer can already see the click. Good narration adds the why: what the step accomplishes and why it matters.
• One idea per line. A line that carries a single point is easy to follow and easy to fix later. Two ideas crammed together sound rushed.
• Keep terms consistent. Decide once how features and product names are worded, then hold the whole script to it. Lock those names so the voice never improvises.
• Preview on real footage. A voice that sounds fine in isolation can fight the pacing of your video. Preview against the footage before you render.

Common mistakes to avoid

• Narration that reads the buttons out loud instead of explaining the point of each step.
• Lines so long the voice runs past the action they describe.
• Product names said a different way each time, because they were never locked.
• Picking a voice without previewing it on the actual video first.
• Skipping captions, so muted viewers get nothing from the voiceover.
• Cramming several tasks into one long video, so nobody can find the part they need.

Input

Record in-browser, or upload MP4, WebM, or MOV

Length

6-15 minutes per video, by plan

Quality

Up to 2K, or upload files up to 650 MB

You get

An MP4 with voiceover, plus captions, chapters, and a PDF guide

Languages

Voice in any of 70+, no re-recording

Free plan

10 minutes of export a month, no card

Voiceovers in other languages, plus captions and chapters

The same project gives you more than the raw narration. You can add captions so the video works with the sound off, drop in chapters so viewers jump to the step they need, and add background music if the silence feels flat. Because the narration starts as editable text, none of this means re-recording anything.

AI voiceover vs your own microphone

Both are supported, and the right choice depends on the video. An AI voice is faster, sounds clean every time, stays consistent across a whole library, and is trivial to edit, since you change text rather than re-record audio. Your own microphone is the better fit when the video needs your personal voice, an in-person tone, or a delivery only you can give. You can preview the AI voice against the footage before you commit, so it is easy to try the AI voice first and fall back to your own microphone only where it adds something the AI voice cannot. Many teams settle on the AI voice for the bulk of their library and reach for their own microphone on the occasional video that needs a human touch.

Frequently asked questions

Add a voiceover to your first video free. Get started with 10 minutes of export a month, then see how to make a product demo video or how to make a tutorial video by recording your screen next.