Voice over text: how to turn text into speech

The fastest way to understand speech synthesis is to voice some text right now, then dig into the details. By the end of this chapter you'll have a finished audio file and a feel for how to make a voice sound alive instead of robotic.

In a minute: your first result

Speech synthesis (text-to-speech, TTS) is simple: you paste text, pick a voice — the neural network reads it. Modern voices sound natural: with intonation, breath and pauses. This is a long way from the "robot in the navigator".

Paste a couple of sentences and choose a voice. Your first generations are free after signing up.

What makes a voice-over alive, not "robotic"

A voice sounds natural when you help the model with intonation. A few techniques:

• Punctuation is the score. Periods, commas, dashes and ellipses set the pauses and rhythm. Text with no marks reads flat.
• Write the way people speak. Long, bureaucratic constructions sound unnatural even in a perfect voice. Short phrases feel livelier.
• Flag tricky words. Names, terms and heteronyms ("I read books" vs "I read it yesterday") are sometimes said the wrong way — it helps to hint at them.
• Match the voice to the task. Upbeat for ads, calm for an audiobook, neutral for instructions.

Where you need it

• Audiobooks and article narration — listen instead of reading.
• A voice for video — a narrator with no recording.
• Voice notifications and assistants — in apps and services.
• Accessibility — voicing content for blind users.
• Learning — pronunciation, languages.

Emotion and styles

Modern models can not only "read" but "act": happily, sadly, with a whisper, like a news anchor. If a service supports it — set the emotion in words or markup. This turns a flat read into expressive speech.

What's next

Voicing text is the foundation. Its most common use is a voice for video — which has its own subtleties around timing and intonation.

In the Twelver chat you can paste text right into the conversation and get a voice-over in the voice you want. A few generations are free after signing up.