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Automate Image Editing & Instagram Posting with Nano Banana & GPT-5 Captions

by Automate With Marc•Updated: Last update 14 days ago•Source: n8n.io

Getting Started

Auto-Edit Google Drive Images with Nano Banana + Social Auto-Post

Drop an image into Google Drive and let this workflow handle the rest: it auto-cleans and enhances the image with Google’s Nano Banana (via Wavespeed API), generates a catchy caption with GPT-5, and publishes directly to your connected social accounts using Postiz.

**👉 Watch step-by-step video tutorials of workflows like these on ** https://www.youtube.com/watch?v=4wk6PYgBtBM&list=PL05w1TE8X3bb1H9lXBqUy98zmTrrPP-s1

What it does

  • Triggers from Google Drive when a new image is uploaded
  • Sends the image to Nano Banana to declutter, brighten, and make it real-estate/photo-listing ready
  • Polls for the edited result until it’s complete
  • Logs the edited image URL into Google Sheets for tracking
  • Downloads and uploads the edited image into Postiz media library
  • Generates an engaging caption with GPT-5 Caption Agent
  • Publishes instantly to Instagram (can be extended to TikTok, LinkedIn, etc.)

Perfect for

  • Real-estate agents posting property shots
  • Ecommerce sellers updating product catalogs
  • Social media marketers needing fast, polished posts
  • Apps & Services

Tools Used

  • Google Drive (Trigger)
  • Wavespeed API – Google Nano Banana (Image editing)
  • Google Sheets (Logging)
  • Postiz (Social scheduling/posting)
  • OpenAI GPT-5 (Caption agent)

Setup

  • Connect your Google Drive and select the upload folder.

  • Add your Wavespeed API key for Nano Banana.

  • Connect Google Sheets for logging.

  • Add Postiz API credentials and set the integration ID for your channel(s).

  • Enter your OpenAI API key for GPT-5 captioning.

Customization

  • Adjust the edit prompt for different use cases (e.g., product cleanup, lighting tweaks).

  • Change Postiz post type to scheduled instead of “now.”

  • Add more Postiz posts for multi-platform publishing.

  • Insert an approval loop (Slack/Email) before posting.

Logs

  • Edited Image Log (Sheets): stores final image URL + timestamp.

  • Publishing Log (Sheets): tracks workflow status per asset.

Notes

  • Sticky notes in the template explain each major block.

  • Replace sample IDs with your own (folder IDs, sheet IDs, Postiz integration).

  • Keep all API keys in n8n Credentials, not in node parameters.