🎬 Generate two-host PDF podcasts with GPT-5, Smallest AI, and Gmail
⚡ 34 views · 🎬 Content Creation & Video
Description
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-smallestaicommunity 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:
averyanddevansh) - 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
englishin the prompt to generate podcasts in any of Smallest AI’s supported languages — tryarjun+aanyafor Hindi,arvind+niharikafor Tamil - Use cloned voices from the Voice Clone resource for personalized hosts
- Replace Gmail with Slack, Telegram, or Drive Upload for different delivery channels
🔗 Nodes Used
Gmail, n8n Form Trigger, Extract from File, OpenAI
📥 Import
Download workflow.json and import into n8n:
Workflow menu → Import from File