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

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](https://app.smallest.ai/dashboard/api-keys) - 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