Generate audio from text using OpenAI and Webhook | Text to speech workflow

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2/3/2026

Who is this for? This workflow is ideal for developers, content creators, or customer support teams looking to automate text-to-speech conversion using OpenAI.

What problem does this solve? It automates the process of converting text inputs into speech, reducing manual effort and enhancing productivity.

What this workflow does: This workflow triggers when a text input is received via a webhook, converts it into audio using the OpenAI API, and sends the generated speech back through a webhook response.

Setup:

Ensure you have an OpenAI API key (you can get it from OpenAI website).
Set up the webhook URL and parameters.
Configure the OpenAI node with your API key (Create New Credentials).
set up the responde to webhook node.

Generate Audio from Text using OpenAI (Text-to-Speech Workflow)

This n8n workflow provides a simple API endpoint to convert text into spoken audio using OpenAI's Text-to-Speech (TTS) capabilities. It's designed to be a straightforward solution for generating audio files from textual input via a webhook.

What it does

Listens for a Webhook Request: The workflow starts by exposing a webhook URL. When this URL receives an HTTP POST request, it triggers the workflow.
Generates Audio with OpenAI: It takes the text provided in the webhook request and sends it to the OpenAI API to generate an audio file using its Text-to-Speech model.
Responds with Audio: The generated audio content (likely an audio file or a URL to it) is then returned as the response to the initial webhook request.

Prerequisites/Requirements

n8n Instance: A running instance of n8n.
OpenAI Account & API Key: You will need an OpenAI account and a valid API key with access to their Text-to-Speech models. This key must be configured as an n8n credential.

Setup/Usage

Import the Workflow:
- Copy the provided JSON code.
- In your n8n instance, click "New" in the top left, then "Import from JSON".
- Paste the JSON code and click "Import".
Configure OpenAI Credentials:
- Locate the "OpenAI" node in the workflow.
- Click on the "Credential" field and select an existing OpenAI credential or create a new one.
- When creating a new credential, provide your OpenAI API Key.
Activate the Workflow:
- Ensure the workflow is activated by toggling the "Active" switch in the top right corner of the n8n editor.
Get the Webhook URL:
- Click on the "Webhook" node.
- Copy the "Webhook URL" displayed in the node's settings panel.
Send a Request:
- Send an HTTP POST request to the copied Webhook URL. The request body should contain the text you want to convert to speech.
- Example (using curl):
```
curl -X POST "YOUR_WEBHOOK_URL" \
-H "Content-Type: application/json" \
-d '{"text": "Hello, this is a test of the n8n text-to-speech workflow."}'
```
- The workflow will respond with the generated audio content.

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