n8n Instagram Auto-Posting: Google Drive, AI Captions & FB Graph

Auto-post Instagram from Google Drive—AI captions included

This n8n workflow automatically turns your images or video reels stored in Google Drive into Instagram posts. It pulls filenames from a Google Sheet, generates AI-powered captions with OpenAI, and publishes directly to your Instagram Business/Creator account using the Facebook Graph API.

What this workflow does

• Reads your posting list from Google Sheets with columns for Filename (Google Drive name), Caption (optional), and URL (your Reel/Image reference in Google Drive).
• Connects to Google Drive and retrieves the correct image/video files from a folder path you configure, matching by the filenames in your sheet.
• Generates captions with OpenAI when the Caption column is left empty, using OpenAI parameters (including temperature and model settings) to control creativity.
• Publishes to Instagram through the Facebook Graph API, ensuring your Instagram account is properly connected to a Facebook Page.

Use cases

• For SaaS teams: maintain a simple Google Sheet “content queue” and publish on schedule without manual caption writing.
• For creators: store media assets in Google Drive and rely on AI captions to keep your Instagram consistent.
• For automation engineers: build a reusable Instagram auto-posting pipeline using n8n integrations and API credentials.

Technical details

• Google Drive Trigger / retrieval: access your media files from a configured folder and match by filename from the sheet.
• Google Sheets: defines the data source (Filename, Caption, URL).
• OpenAI captions: uses n8nn8n-nodes-langchainopen ai (OpenAI integration) to generate captions based on the image content.
• Facebook Graph API: posts to your Instagram Business/Creator account.
• Prerequisites: Google account, OpenAI API key, Facebook Developer account with Instagram Graph API access, and an Instagram Business/Creator account connected to a Facebook Page.