Text to Speech for YouTube Videos

A voiceover that finishes before the visual it describes feels like a mistake to the viewer, and one that finishes after it forces a rewind. The fix is to write the script with timings in it rather than against it.

Practically, that means opening the edit first and timing each line to the moment it belongs to, then writing to that length. A line that needs four seconds of screen time should be written at roughly ten to twelve words, because English narration runs at about 150 words per minute.

Leave a beat of silence at every scene change. Silence reads as deliberate pacing, and it is the difference between narration that sounds laid over a video and narration that sounds like it belongs to one.

The right voice depends entirely on what kind of video you are making. An explainer or tutorial needs energy, because the visuals are carrying the information and the voice has to keep attention on them. A documentary or essay does the opposite, and an energetic voice there is exhausting.

Register follows the same logic. A higher, brighter voice suits a product walkthrough. A lower, steadier one suits analysis. The 41-voice catalogue covers American and British English in both, so the choice is about intent rather than availability.

Consistency across a channel matters more than picking the theoretically ideal voice. A channel that changes narration style between videos reads as inconsistent, and viewers notice that long before they can say why.

Video scripts are often drafted as on-screen text because that is faster to write, and then read verbatim by the voice. The result sounds like a bulleted list being spoken, which is the most recognisable sign of unprepared voiceover.

Expand every fragment into a sentence and remove the punctuation that only makes sense visually. "Click here" becomes "Click the button here." "1. Add water 2. Boil" becomes "First, add the water, and bring it to a boil."

Delete anything the viewer can already read faster than they can hear it. If a figure is on screen for four seconds, it does not need to be spoken as well, and saying it twice is the fastest way to lose a viewer.

A ten-minute video script is well past the 2,000-character per-job limit, so a full video is generated in sections. This is not really a constraint for video work: sections that map to scene changes are the unit you would edit in anyway.

Generate each section separately and place the files on the timeline at the timings you wrote them to. Because the split is already aligned to the edit, there is no audio to join and nothing to smooth over.

Keep every section on the same voice and speed. Changing settings mid-video is the most audible mistake in a narrated edit, and it is entirely avoidable by treating the whole video as one project.