n8n

Use Smallest AI inside n8n to build no-code and low-code voice automations - transcribe audio, synthesize speech, and clone voices as part of any workflow using the n8n-nodes-smallestai community node.

Installation

In your n8n instance, go to Settings → Community Nodes → Install and search for:

n8n-nodes-smallestai

Or install via npm (for self-hosted instances):

npm install n8n-nodes-smallestai

Credentials

1

Sign up and navigate to API Keys

Sign up at app.smallest.ai and open the API Keys page directly.

2

Create a new key

Click Create API Key, give it a name, and copy the key immediately - it won’t be shown again.

3

Add credentials in n8n

In n8n, go to Credentials → New → Smallest.ai API, paste your API key, and save.

Transcribe Audio from a Form

The quickest way to try the node - a form that accepts an audio file upload and returns its transcript via the Smallest AI STT API.

Workflow JSON

Copy and import this directly into n8n via File → Import from JSON:

{
  "name": "Transcribe Audio",
  "nodes": [
    {
      "parameters": {
        "formTitle": "Sample Audio",
        "formDescription": "Upload a sample Audio",
        "formFields": {
          "values": [
            {
              "fieldLabel": "audio",
              "fieldType": "file",
              "acceptFileTypes": ".mp3, .wav"
            }
          ]
        },
        "options": {}
      },
      "type": "n8n-nodes-base.formTrigger",
      "typeVersion": 2.5,
      "position": [-144, -48],
      "id": "012e15bf-7dea-401f-87d8-36859543bf21",
      "name": "On form submission"
    },
    {
      "parameters": {
        "resource": "stt",
        "binaryPropertyName": "audio",
        "additionalOptions": {}
      },
      "type": "n8n-nodes-smallestai.smallestai",
      "typeVersion": 1,
      "position": [112, -48],
      "id": "b2398e55-5ed0-4e0e-915b-180d17525b42",
      "name": "Transcribe audio",
      "credentials": {
        "smallestaiApi": {
          "id": "AuVcs5R2gmnnsCxk",
          "name": "Smallest.ai account"
        }
      }
    }
  ],
  "pinData": {},
  "connections": {
    "On form submission": {
      "main": [
        [
          {
            "node": "Transcribe audio",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": false,
  "settings": {
    "executionOrder": "v1",
    "binaryMode": "separate"
  },
  "tags": []
}

Node Configuration

Optional enrichment under Additional Options:

Operations

The Smallest AI node exposes three resources:

Speech-to-Text (STT)

Transcribe audio in 20+ languages. The node reads binary audio data from a previous step and sends it to the Smallest AI STT API.

Read/Download Audio  →  Smallest AI (Transcribe Audio)  →  Use transcript

Supported languages: English, Hindi, Spanish, French, German, Bengali, Marathi, Gujarati, and more (21 streaming + 26 pre-recorded languages). See the Pulse model card for the full list. Set language to a regional aggregator (north_indic, multi-eu, multi-asian) for automatic detection within a language family.

Optional detections:

Text-to-Speech (TTS)

Convert any text to audio using Lightning V3.1. The node outputs binary audio data you can save, email, or pass downstream.

Trigger / Data  →  Smallest AI (Synthesize Speech)  →  Save / Send audio

Configuration:

Popular voices:

Voice Cloning

Clone a voice from an audio sample, then use the returned voice ID in any TTS step.

Upload Audio  →  Smallest AI (Add Voice)  →  Store Voice ID

Text input  →  Smallest AI (Synthesize Speech, Custom Voice ID)  →  Audio output

Set Voice Source to Custom in the TTS node and paste the cloned voice ID.

Use Case Ideas

Notes

• Audio must be passed as binary data in n8n. Use nodes like Read/Write Files, HTTP Request, or Form Trigger to load audio into the pipeline before the Smallest AI node.
• For the form-based workflow, the Binary Property field in the STT node must exactly match the label of the file upload field in your form.
• The node is compatible with n8n’s AI Agent tool interface (usableAsTool: true) - you can use it as a tool inside an AI agent workflow.

Links