Transcribe & Analyze Telegram Voice Messages with AssemblyAI & GPT-4.1 to Gmail

Telegram Voice → AI Summary & Sentiment Analysis via Gmail

This n8n template demonstrates how to capture Telegram voice messages, transcribe them into text using AssemblyAI, analyze the transcript with AI for summary and sentiment insights, and finally deliver a structured email report via Gmail.

Use cases Automating meeting or lecture voice note transcriptions.
Gathering student feedback or training session insights from voice messages.
Quickly summarizing Telegram-delivered audio inputs into structured reports.
Reducing manual effort in capturing sentiment and key action items from conversations.

How it works A voice message is sent to a connected Telegram Bot.
The workflow fetches the file and uploads it to AssemblyAI.
AssemblyAI generates a transcript from the audio.
The transcript is analyzed by OpenAI to extract:
Executive summary (120–180 words)
Sentiment label and score
Key points
Action items (if any)
Notable quotes
Topics
The formatted analysis is sent as an email report using Gmail.
The workflow ends with a clean summary email containing actionable insights.

How to use Import this workflow into your n8n instance.
Set up and connect the required credentials:
Telegram Bot API token
AssemblyAI API key
OpenAI API key
Gmail OAuth2 account
Replace placeholders (e.g., <<YOUR_EMAIL ID>> and <<YOUR_ASSEMBLYAI_API_KEY>>) with your actual values.
Start the workflow. Whenever a voice message is received on the Telegram Bot, the workflow will process it end-to-end and deliver a polished email report.

Requirements Telegram Bot account (API token)
AssemblyAI account with API key
OpenAI account with API key
Gmail OAuth2 credentials configured in n8n
Active n8n instance

Customising this workflow You can customize the email formatting, sentiment thresholds, or extend the workflow to save transcripts into Google Drive, Airtable, or any other connected apps. Additionally, you can trigger the same workflow from multiple input sources (e.g., local audio files, Google Drive links, or Telegram).