🎬 Create Instagram, TikTok and LinkedIn carousels with OpenAI and PostWire

⚡ 4 views · 🎬 Content Creation & Video

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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

  1. Receives a submission from an n8n form with the topic, audience, number of slides, and target networks.
  2. Uses OpenAI (gpt-5-mini) to generate a JSON plan containing per-slide headlines, image prompts, alt text, and platform-specific captions.
  3. 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.
  4. 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.
  5. If all platforms publish successfully, appends a “posted” record with slide headlines and post links to Google Sheets.
  6. 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

  1. Create a PostWire account, connect Instagram/TikTok/LinkedIn, and add an HTTP Header Auth credential in n8n with Authorization: Bearer <your PostWire API key> for the PostWire HTTP Request steps.
  2. Add an OpenAI credential with access to gpt-5-mini and gpt-image-1-mini.
  3. Connect Google Sheets OAuth credentials and select the target spreadsheet and sheet in both Google Sheets append steps.
  4. Connect Gmail credentials and replace you@example.com with your recipient address.
  5. Use the form URL from the form trigger to submit a test topic and confirm posting permissions for the selected networks.

🔗 Nodes Used

Google Sheets, HTTP Request, Gmail, n8n Form Trigger, OpenAI

📥 Import

Download workflow.json and import into n8n: Workflow menu → Import from File

📖 Importing guide · 🔑 Credential setup