Amazon Polly
Developer Guide

Amazon Polly: How It Works

Amazon Polly converts input text into life-like speech. You call one of the speech synthesis methods, provide the text you wish to synthesize, select one of the available Text-to-Speech (TTS) voices, and specify an audio output format. Amazon Polly then synthesizes the provided text into a high-quality speech audio stream.

  • Input text – Provide the text you want to synthesize, and Amazon Polly returns an audio stream. You can provide the input as plain text or in Speech Synthesis Markup Language (SSML) format. With SSML you can control various aspects of speech such as pronunciation, volume, pitch, and speech rate. For more information, see Generating Speech from SSML Documents.


  • Available voices – Amazon Polly provides a portfolio of multiple languages and a variety of voices, including a bilingual voice (for both English and Hindi). For most languages you can select from several different voices, both male and female. You specify the voice ID name when launching the speech synthesis task, and then the service uses this voice to convert the text to speech. Amazon Polly is not a translation service—the synthesized speech is in the language of the text. However, numbers using digits (for example, 53, not fifty-three) are synthesized in the language of the voice. For more information, see Voices in Amazon Polly.


  • Output format – Amazon Polly can deliver the synthesized speech in multiple formats. You can select the audio format that suits your needs. For example, you might request the speech in the MP3 or Ogg Vorbis format to consume in web and mobile applications. Or, you might request the PCM output format for AWS IoT devices and telephony solutions.

What's Next?

If you are new to Amazon Polly, we recommend that you to read the following topics in order:

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