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Generate an OpenAI Speech MP3

Convert text into an MP3 using OpenAI speech synthesis.

Setup and use

Connect OpenAI in Generate MP3 speech. Run Open Flow with text and a voice; the source example is The quick brown fox jumped over the lazy dog. with alloy. In n8n, edit Set input text and TTS voice and connect an OpenAI credential to the HTTP node. Input is limited to 4,096 characters.

Behavior

One request sends the text to tts-1 and returns MP3 audio. Open Flow produces a downloadable speech.mp3 artifact; n8n returns binary data. Failed synthesis or invalid audio stops the run. If you share the recording, disclose that the voice is AI-generated.

OpenAI has announced the shutdown of tts-1 on January 6, 2027. The recommended Realtime API replacement uses a different workflow.

Inspiration & credits

Changes to the source

Remove the redundant literal Authorization header; use the OpenAI connection instead.
Validate input and MP3 output, correct the source’s input limit and preserve the audio as a downloadable artifact.

Adapted from Text to Speech (OpenAI) in Zie619/n8n-workflows. The source export does not identify a separate template author or license.

The collection’s MIT notice is pinned at a later revision. This is the collection notice at that revision; it does not establish a separate original template author’s license. Our changes are listed above; see repository licensing.

MIT License

Copyright (c) 2025 Zie619

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.