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Generate two-host PDF podcasts with GPT-5, Smallest AI, and Gmail

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Created by: Sumit Mor || sosumti001
Sumit Mor

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Last update 21 hours ago

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Generate two-host AI podcast episodes from any PDF — in 9 Indian languages or your own cloned voice — powered by Smallest AI.

Turn whitepapers, research reports, blog drafts, lecture notes, or company memos into NotebookLM-style audio briefings. Native Hindi, Tamil, Telugu, Kannada, Malayalam, Bengali, Marathi, Gujarati, and Punjabi support makes this the only n8n template that ships authentic Indian-language podcast generation out of the box.

Good to know

  • Lightning V3.1 generates ~100ms time-to-first-byte; a 5-page PDF produces a 4-minute podcast in roughly 60 seconds total
  • Smallest AI offers a free tier — get an API key
  • Voice cloning lets you cast yourself or a colleague as one of the hosts using just a 10-second voice sample
  • Pure JavaScript audio concatenation — no FFmpeg required, works on n8n Cloud

How it works

  • Upload a PDF via the form trigger
  • Extract text and pass it to GPT-5 to generate a structured 2-host script in JSON
  • Split the script and route each turn to the matching host's TTS branch
  • Smallest AI Lightning synthesizes each turn at 24 kHz with sub-100ms latency
  • A Code node concatenates all WAV chunks into a single audio file in correct conversational order
  • The finished podcast is emailed to the address you specify

Set up steps

  • Install the n8n-nodes-smallestai community node via Settings → Community Nodes
  • Connect Smallest AI, OpenAI, and Gmail credentials (~5 minutes)
  • Pick voice IDs for Host A and Host B in the two Synthesize Host nodes (defaults: avery and devansh)
  • Update the recipient email in the Gmail node
  • Sticky notes inside the workflow walk you through each section

Requirements

  • Smallest AI account — free tier available at smallest.ai
  • OpenAI API key — GPT-5 or GPT-4o-mini both work
  • Gmail OAuth2 credential for delivery
  • n8n-nodes-smallestai community node installed

Customising this workflow

  • Swap the Form trigger for a Webhook to integrate with other apps or chatbots
  • Change the LLM system prompt to alter podcast format (interview, debate, monologue, kids' story)
  • Edit english in the prompt to generate podcasts in any of Smallest AI's supported languages — try arjun + aanya for Hindi, arvind + niharika for Tamil
  • Use cloned voices from the Voice Clone resource for personalized hosts
  • Replace Gmail with Slack, Telegram, or Drive Upload for different delivery channels