Create and post social media image captions with GPT-4.1-mini and Google Sheets

Social Media Posting Automation with Image and Caption

How it works

This AI-powered workflow streamlines your social media posting process, transforming hours of manual caption writing, image uploading, and scheduling into a fully automated system. You define the topic and image once, and the workflow handles caption generation, review, approval, and posting to your selected platforms.

Automated Flow

1. Generate Caption
   Trigger the workflow manually and set your post topic and image URL in the Set node. The AI (GPT-4.1-mini) generates a high-quality, engaging social media caption tailored to your audience, platform, and content goals.

2. Store in Google Sheet
   The generated caption, along with your image URL and post metadata, is automatically appended to your Google Sheet. This creates a central location to review and manage all your social media content.

3. Review and Approve
   You review the generated caption in the sheet, make any edits if needed, and update the status to Approved. You can also select the platform(s) where you want to post.

4. Automatic Posting
   Once the status is updated to Approved, the next workflow is triggered automatically. It posts your caption and image to the selected social media platform(s) without any further manual effort.

The result?
A seamless, end-to-end social media posting process where captions are AI-generated, stored, reviewed, and posted automatically. Focus on strategy and engagement instead of repetitive manual posting.

Setup Steps

Setup time: ~10–15 minutes
What you’ll need: OpenAI API key, Google account, access to your social media platform(s)

1. Connect Your Google Account

   • Click on the Google Sheets node in your workflow.
   • Select the Credential dropdown and choose + Create New Credential.
   • Authenticate your Google account and grant the necessary permissions.

2. Initialize Your Spreadsheet

   • Run the workflow once by clicking the play button on the start node.
   • This will automatically create a Google Sheet with all the required columns for caption tracking and approval.

3. Add Your OpenAI API Key

   • Navigate to the AI Agent node.
   • Click the Credential dropdown and select + Create New Credential.
   • Paste your OpenAI API key and save.
   • Get your API key from platform.openai.com/api-keys.

4. Set Post Topic and Image

   • Update the title in the Set node with the topic you want to post.
   • Add the image URL associated with your post.

5. Review Captions and Approve

   • Open your Google Sheet, review the generated captions, and update the status to Approved.
   • Select the platform(s) where the post should go live.

6. Go Live

   • Once the status is updated, the workflow will automatically post your content to the selected social media platform(s).
   • Sit back and watch your AI-generated captions and images go live automatically.

Ready to automate your social media? Activate your workflow and start posting smarter today! 🚀💡✅