Text-to-Speech (TTS)
Last updated June 11, 2026
What is Text-to-Speech in simple terms?
In simple terms, text-to-speech is a reading voice for any text. It takes written words and speaks them aloud in a natural voice — the technology behind audiobooks read by AI and screen readers that voice what's on a page.
What is Text-to-Speech?
Text-to-speech is technology that converts written text into spoken audio, generating a natural-sounding human voice that reads the words aloud.
Text-to-speech (TTS) is technology that turns written words into a spoken voice. You give it text, and it produces audio of that text being read aloud — ideally in a voice smooth and natural enough that it's pleasant to listen to. It is the mirror image of speech-to-text, which goes the other way, turning talking into typing. TTS handles the 'speaking' direction: written words in, a human-sounding voice out.
Making it sound natural is the hard part, and it's why early text-to-speech sounded so robotic. Real speech isn't flat — it has rhythm, stress, and intonation that change with meaning. A good system has to know that a question rises at the end, which word in a sentence to emphasize, where to pause, and how to pronounce tricky words and abbreviations correctly. Older systems stitched together pre-recorded fragments of speech, which sounded choppy. Modern TTS uses neural networks that generate the audio waveform directly, producing voices with such natural pacing and warmth that they can be hard to tell from a real person, and can even be made to mimic a specific voice or convey emotion.
Text-to-speech is a key part of how AI works with language and a major accessibility technology, and it's one of the three pieces inside voice AI — speech recognition to hear, understanding to interpret, and text-to-speech to reply out loud. It reads screens aloud for people who are blind or have low vision, voices satellite navigation and virtual assistants, narrates audiobooks and articles for people on the move, and gives a spoken voice to anyone who can't easily speak for themselves. Anywhere information needs to reach someone by ear rather than by eye, text-to-speech is doing the talking.
Real-world example of Text-to-Speech
A man with low vision wants to catch up on the news but can't comfortably read the small text on a website. His screen reader, powered by text-to-speech, voices the page for him: it speaks each headline aloud, and when he picks one, it reads the whole article in a smooth, natural voice — pausing at the right places, raising its tone for questions, getting the names and numbers right. He browses the day's news entirely by ear, moving from story to story as easily as a sighted reader moves their eyes down the page. The website was only ever written to be read; text-to-speech is what turns it into something he can listen to, opening up information that would otherwise be out of reach.
Related terms
Frequently asked questions about Text-to-Speech
What is the difference between text-to-speech and speech-to-text?
They are opposite conversions. Text-to-speech takes written words and turns them into spoken audio — it reads text aloud. Speech-to-text does the reverse, taking spoken audio and turning it into written words — it transcribes talking into typing. One produces a voice, the other produces a transcript. They're often used together in voice assistants, where speech-to-text hears your request and text-to-speech speaks the answer back, but each handles a different direction of the conversation between writing and speech.
How does text-to-speech work?
It converts written text into audio of a voice reading it. The system first works out how the text should be pronounced and spoken — including stress, rhythm, pauses, and intonation, since natural speech isn't flat — then generates the sound. Older systems pieced together pre-recorded speech fragments, which sounded choppy. Modern text-to-speech uses neural networks that generate the audio waveform directly from the text, producing voices with natural pacing and warmth that can closely resemble a real human speaker.
What is text-to-speech used for?
It's used wherever information needs to reach someone by ear. It powers screen readers that voice on-screen text for people who are blind or have low vision, reads articles and books aloud for people on the move, gives spoken voices to navigation systems and virtual assistants, and provides a voice for people who cannot easily speak. It's also widely used to narrate videos, announcements, and audio content automatically. As one of the core pieces of voice AI, it handles the speaking-out side of any system you can talk to and that talks back.