How to Make AI Voiceover Sound Natural: 10 Fixes
Ten fixes that stop AI voiceover sounding robotic: write for speech, shorter sentences, punctuate for breath, emotion tags, stability, pronunciation rules.
VoiceSmiths TeamListen to this article
AI narration · about 2 min
Nine times out of ten, "it sounds like AI" is the script and the settings, not the model. Same voice, three edits to the script and one notch on a slider, and the read goes from recitation to speech. Ten fixes, in order of how fast they pay off.
1. Write the way people talk
"Therefore", "however", "utilise" read aloud sound like a newsreader with a memo. Use "so", "but", "use". Nobody speaks in written conjunctions.
2. Keep sentences under twenty words
Long sentences make the model breathe in the wrong place. Split at the comma and the rhythm fixes itself.
3. Punctuation is breath
A full stop is a long pause, a comma a short one, an ellipsis a drawn-out one, a dash a turn. If you want a pause, add punctuation, not spaces.
4. Direct with emotion tags
Bracketed words are never read; they change the delivery. One line, different tags:
The full list is in the emotion tags cheatsheet.
5. Stability between 0.4 and 0.6
Maxed-out stability is a robot; minimum is chaos. Start at 0.5, lower for emotional content, higher for news.
6. Similarity no higher than 0.85
On cloned voices, high similarity amplifies the flaws in the sample — nasality, breaths, room tone.
7. Spell out numbers and fix names
Write "twenty twenty-six" rather than "2026" when it matters, and lock brand names in the pronunciation dictionary. One mispronounced proper noun costs the whole passage its credibility.
8. Match the voice to the content
A bubbly voice reading market data or a newsreader telling a love story is wrong no matter how natural the audio. Choose by job: best Chinese AI voices and the voice library.
9. Cast real voices for real characters
One voice playing two characters with a change of pitch breaks the illusion in three seconds. Multi-speaker dialogue binds one voice per role:
[laughs] Fine. Nobody leaves until it does.10. Render the final on the flagship model
Draft on the fast model, finish on the flagship. The difference is audible in one listen:
[curious] 同样一句话,三个模型读出来,你能听出差别吗?[excited] 稳定、自然、还是更有戏。If it still sounds off after all ten, the voice itself is wrong — pick another in the voice library.