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

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1. Workflow Overview

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 comp...

Best for

Content Creation automation workflows
Multimodal AI automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.stickynote, n8n-nodes-base.formtrigger, n8n-nodes-base.extractfromfile, @n8n/n8n-nodes-langchain.openai, n8n-nodes-base.splitout, n8n-nodes-base.switch, n8n-nodes-smallestai.smallestai, n8n-nodes-base.set

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Sumit Mor.

Original n8n.io source

1.1 Workflow description

Title: Generate two-host PDF podcasts with GPT-5, Smallest AI, and Gmail
Workflow name: 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
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

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Main Overview

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 2 - Section 1

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 3 - Section 2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 4 - Section 3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 5 - Section 4

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 6 - Section 5

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 7 - When Form Submitted

Type / Role: n8n-nodes-base.formTrigger - formTrigger
Config choices: Version 2.5

Block 8 - Extract Data from File

Type / Role: n8n-nodes-base.extractFromFile - extractFromFile
Config choices: Version 1.1

Block 9 - Generate Podcast Script (GPT-5)

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 2.1

Block 10 - Split Script Into Turns

Type / Role: n8n-nodes-base.splitOut - splitOut
Config choices: Version 1

Block 11 - Route by Host

Type / Role: n8n-nodes-base.switch - switch
Config choices: Version 3.4

Block 12 - Synthesize Host A Audio

Type / Role: n8n-nodes-smallestai.smallestai - smallestai
Config choices: Version 1

Block 13 - Synthesize Host B Audio

Type / Role: n8n-nodes-smallestai.smallestai - smallestai
Config choices: Version 1

Block 14 - Preserve Host A Order

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 15 - Preserve Host B Order

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 16 - Merge Both Hosts

Type / Role: n8n-nodes-base.merge - merge
Config choices: Version 3.2

Block 17 - Sort by Conversational Order

Type / Role: n8n-nodes-base.sort - sort
Config choices: Version 1

Block 18 - Concatenate WAV Audio

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 19 - Email Podcast to User

Type / Role: n8n-nodes-base.gmail - gmail
Config choices: Version 2.2

3. Summary Table

Workflow	Generate two-host PDF podcasts with GPT-5, Smallest AI, and Gmail
Complexity	advanced
Nodes	19
Categories	Content Creation, Multimodal AI
Author	Sumit Mor
Published	28 Apr 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/15350/15350.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Content Creation workflows Multimodal AI workflows

Frequently asked questions

What does Generate two-host PDF podcasts with GPT-5, Smallest AI, and Gmail do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Content Creation, Multimodal AI use case.

Sumit Mor

1 workflow

Nodes

n8n-nodes-base.stickynote n8n-nodes-base.formtrigger n8n-nodes-base.extractfromfile @n8n/n8n-nodes-langchain.openai n8n-nodes-base.splitout n8n-nodes-base.switch n8n-nodes-smallestai.smallestai n8n-nodes-base.set

Complexity

advanced

Published 28 Apr 2026

Likes 0

View on n8n.io Download Workflow

Install path: /data/workflows/15350/15350.json

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

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

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

How it works

Set up steps

Requirements

Customising this workflow

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Main Overview

Block 2 - Section 1

Block 3 - Section 2

Block 4 - Section 3

Block 5 - Section 4

Block 6 - Section 5

Block 7 - When Form Submitted

Block 8 - Extract Data from File

Block 9 - Generate Podcast Script (GPT-5)

Block 10 - Split Script Into Turns

Block 11 - Route by Host

Block 12 - Synthesize Host A Audio

Block 13 - Synthesize Host B Audio

Block 14 - Preserve Host A Order

Block 15 - Preserve Host B Order

Block 16 - Merge Both Hosts

Block 17 - Sort by Conversational Order

Block 18 - Concatenate WAV Audio

Block 19 - Email Podcast to User

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions