Telegram PDF Q&A with Gemini + Pinecone (n8n Workflow)

Turn your Telegram PDF uploads into instant Q&A—powered by Gemini + Pinecone (n8n workflow)

This n8n workflow lets you upload a PDF in Telegram and then ask follow-up questions directly in chat. It indexes your PDF content in Pinecone using Google Gemini embeddings and generates answers with Google Gemini via retrieval-augmented generation formatted for Telegram HTML.

What this workflow does

• Listens on Telegram: Triggers whenever a new message is received by your Telegram bot.
• Indexes PDFs automatically: If the incoming message includes a document, it downloads the file from Telegram and forces the binary metadata to application/pdf.
• Creates searchable vectors: Splits the PDF text into overlapping chunks, generates embeddings with Google Gemini, and inserts them into a Pinecone index.
• Confirms indexing: Sends a Telegram message indicating how many PDF pages were saved to Pinecone.
• Answers questions with context: If the message is text, it retrieves relevant context from Pinecone and uses the Gemini chat model to generate an answer constrained to that retrieved content.
• Responds in Telegram: Sends the generated response back using Telegram HTML parse mode formatting.

Use cases

• Support & documentation Q&A: Upload product manuals or policies to Telegram, then answer questions without leaving chat.
• Internal knowledge lookup: Index team PDFs (SOPs, contracts, reports) and retrieve exact answers through Pinecone-powered retrieval.
• SaaS operator workflows: Create a lightweight “chat with your PDFs” experience for demos, onboarding, or internal review.

Technical details

• Telegram integration: Telegram Trigger + Telegram nodes for receiving PDFs and sending HTML-formatted answers.
• Embeddings & chat: Google Gemini (PaLM) API credential used for both embeddings generation and Gemini chat responses.
• Vector database: Pinecone index (e.g., named telegram) to store and retrieve embeddings for retrieval-augmented generation.
• Workflow control: Uses nodes including if, code, limit, sticky note, stop, and error.