Why insert pause markers at all?

AI avatar voices read straight through punctuation faster than a human would. Adding explicit pause or break markers between sentences and paragraphs makes delivery feel natural and gives the viewer time to absorb each point.

How are long sentences detected?

The formatter flags any sentence over roughly 25 words. Long sentences make avatar narration sound breathless and increase the chance of awkward emphasis, so splitting them improves clarity.

Why list proper nouns?

Brand names, place names and acronyms are where text-to-speech most often mispronounces. The tool surfaces capitalised words mid-sentence so you can add a phonetic spelling or pronunciation hint before rendering.

How is duration estimated?

It counts words and divides by about 140 words per minute, a typical narration pace. Treat it as a guide — actual length depends on the avatar voice and the pauses you keep.

Is my script uploaded anywhere?

No. All formatting happens locally in your browser. Your text is never sent to a server.

AI Avatar Video Script Formatter

AI avatar video script formatter

Avatar voices read text very literally, so a script that looks fine on the page can sound rushed and robotic on screen. This formatter prepares your script for HeyGen or Synthesia: it inserts pause markers, flags sentences that are too long, surfaces proper nouns that may need a pronunciation guide, and estimates the finished duration.

How it works

The tool processes your text in a few passes:

Pause insertion — it adds a break marker (<break> for HeyGen, or a pause hint for Synthesia) between paragraphs and after sentence-final punctuation so delivery has natural rhythm.
Sentence-length check — any sentence over ~25 words is flagged, because long runs make avatars sound breathless.
Proper-noun scan — capitalised words that appear mid-sentence are listed as pronunciation candidates; these are where TTS most often slips.
Duration estimate — word count ÷ ~140 wpm gives an approximate runtime.

Tips for natural avatar narration

Write for the ear, not the page — short declarative sentences read best.
Spell out tricky names phonetically the first time, e.g. “Gera (GEH-ra)”.
Keep one idea per sentence so pauses land where the meaning breaks.
Read the formatted output aloud before rendering — if you stumble, the avatar will too.