Create Instagram, TikTok and LinkedIn carousels with OpenAI and PostWire

Description

Quick Overview This workflow collects a carousel topic via an n8n form, uses OpenAI to plan slide copy and generate images, uploads the slides to PostWire, and publishes them as Instagram, TikTok, and LinkedIn multi-image posts, logging results to Google Sheets and emailing failures via Gmail. How it works Receives a submission from an n8n form with the topic, audience, number of slides, and target networks. Uses OpenAI (gpt-5-mini) to generate a JSON plan containing per-slide headlines, image prompts, alt text, and platform-specific captions. For each planned slide, requests an upload URL from PostWire, generates a square image with OpenAI GPT Image (gpt-image-1-mini), uploads the PNG to PostWire, and finalizes it to get a hosted media URL. Aggregates all slide media URLs, sorts them into the original slide order, and publishes a multi-image post to the selected platforms via PostWire using an idempotency key based on the form submission. If all platforms publish successfully, appends a “posted” record with slide headlines and post links to Google Sheets. If any platform fails, logs the error details to Google Sheets and sends a Gmail message with the platform-specific fixes and any successfully published links. Setup Create a PostWire account, connect Instagram/TikTok/LinkedIn, and add an HTTP Header Auth credential in n8n with Authorization: Bearer for the PostWire HTTP Request steps. Add an OpenAI credential with access to gpt-5-mini and gpt-image-1-mini. Connect Google Sheets OAuth credentials and select the target spreadsheet and sheet in both Google Sheets append steps. Connect Gmail credentials and replace you@example.com with your recipient address. Use the form URL from the form trigger to submit a test topic and confirm posting permissions for the selected networks. An n8n automation workflow template by PostWire.

Community Metrics

Categories

• Automation
• AI

Tags

• n8n
• workflow
• google-sheets
• http-request
• gmail
• openai

Capabilities

• 4 nodes

Information