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The LMNT Speech REST API provides facilities for synthesizing emotive, human-like speech audio from text input. There is support for creating custom voices from a user-provided audio input data set. Those voices can then be used for speech synthesis, in addition to those already provided as part of the LMNT system.

Introduction

LMNT empowers creative expression through speech, creating emotive, human-like speech and custom voices that delight.

Overview

Advanced Controls

How to generate speech from text as quickly as possible.

Optimizing for Low Latency

Authentication

From local development to production, LMNT's SDKs make it easy to integrate LMNT speech into your application.

LMNT SDKs

The changelog below reflects new product developments and updates on a monthly basis.

Reference for the Speech class in the Python SDK

Speech

Reference for the StreamingSynthesisConnection class in the Python SDK

StreamingSynthesisConnection

Examples of how you can use our API in your own projects.

Code Samples

A Node.js module to provide convenient access to the LMNT API from applications written in Javascript.

Reference for the Speech class in the Node.js SDK

Reference for the StreamingSynthesisConnection class in the Node.js SDK

Synthesizes speech for a supplied text string. Returns binary audio data in one of the supported audio formats. 
This simplified version of synthesize can be directly used in HTML5 audio tags. 

Synthesize speech

Synthesizes speech for a supplied text string, returning advanced information. Returns an object that contains a base64-encoded audio file, the seed used in speech generation, and optionally an object detailing the duration of each word spoken.

Submits a request to create a voice with a supplied voice configuration and a batch of input audio data.

Date	Description
Nov 16, 2023	The v1 API is here! We’ve added a number of new features/endpoints, including the ability to create, update, and delete voices.
Aug 28, 2023	`synthesize` now accepts a `length` parameter to adjust audio output duration to the specified length
Jul 13, 2023	custom voice creation/cancellation API

API Documentation

Speech

Voice

Account

Introduction

What’s new

Authentication

API Documentation

Speech

Voice

Account

​What’s new

​Authentication

What’s new

Authentication