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

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.