The long definition
A voiceover is narration heard over the images without requiring the speaker to appear on screen. It can explain a gesture, connect scenes, or express the question driving a demonstration. It is distinct from background music and incidental sound.
The most useful narration adds information the image cannot supply by itself. Match its pace to visible actions, leave room for key details, and provide readable captions so the video remains understandable without sound.
Anatomy: Voiceover
Write for the ear and time the words against the actual shots.
- 01ScriptUse short sentences with one idea each.
- 02TimingPlace each sentence over the action it explains.
- 03DeliveryChoose a tone that fits the scene.
- 04CaptionsCheck readable wording and placement.
A concrete example
Illustrative example · modular storage
“Move the divider, then place the larger items on this side.”Synchronise the sentence with the divider being moved.
The narration explains a useful action while the image demonstrates it, without requiring a long introduction.
Do
- Read the script aloud.
- Align narration with gestures.
- Check the video with sound off.
Don't
- Describe every visible detail.
- Rush a long script into a short shot.
- Let music cover the speech.
How Reacast uses this concept
Write the intended narration beside each scene in your Reacast storyboard, then review its timing with the available footage before export.