AI WhatsApp Chatbot: Text, Voice, Images & PDF Support

Transform your WhatsApp into a powerful AI assistant that handles text conversations, voice messages, image analysis, and PDF document processing with this comprehensive n8n automation workflow.

What This Workflow Does

This multimodal AI WhatsApp chatbot automatically detects incoming message types and responds intelligently using OpenAI's advanced models. The workflow seamlessly processes four distinct content types through smart automation logic:

• Text Messages: Processed by OpenAI GPT-4o-mini with customized system prompts for concise, mobile-optimized responses
• Voice Messages: Downloaded and transcribed using OpenAI Whisper, then analyzed by AI with optional text-to-speech conversion for audio replies
• Image Analysis: Images are converted to base64 format and analyzed by image-aware AI models, providing rich structured descriptions perfect for accessibility or visual content interpretation
• PDF Processing: MIME-type filtered documents have their content extracted and combined with user messages for AI-powered summaries and answers

Use Cases

Perfect for businesses wanting to provide 24/7 customer support through WhatsApp, educational institutions offering document analysis services, or accessibility-focused organizations helping visually impaired users understand visual content. Content creators can leverage voice transcription features, while professionals can get instant PDF summaries and document insights.

Technical Details

Built using essential n8n nodes including Input type detection, conditional logic with If and Switch nodes, Set nodes for data transformation, and Code nodes for advanced processing. The workflow integrates WhatsApp Business API with multiple OpenAI services (GPT-4o-mini, Whisper, and text-to-speech) to deliver a complete multimodal experience.

This ready-to-deploy n8n workflow combines intelligent message routing with cutting-edge AI capabilities, making it an essential automation tool for any organization looking to enhance their WhatsApp communication with comprehensive AI assistance.