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Design and Post LinkedIn Content with AI Captions and Custom Templates

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Created by: Gilbert Onyebuchi || gilbert-onyebuchi

Gilbert Onyebuchi

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Last update 2 days ago

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This workflow leverages n8n to automate LinkedIn content creation from start to finish. Upload an image and quote through a web form, and get a professionally designed post with AI-generated captions, ready to publish in seconds.

Features

  • Randomly selects from 6 professional design templates for visual variety
  • Converts HTML designs to high-quality images (90-95% JPEG quality)
  • Generates engaging captions using OpenAI's GPT models
  • Built-in caption editor for customization before posting
  • Direct publishing to LinkedIn profiles or company pages
  • Auto-compresses images for optimal LinkedIn upload

Prerequisites

  1. N8N Instance: A running n8n instance (cloud or self-hosted)
  2. OpenAI API: Active account with API access for caption generation
  3. LinkedIn Account: Profile or company page with API access
  4. Image Conversion API: HTML CSS to Image account
  5. Web Hosting: Platform to host the web form (Netlify, Vercel, or custom server)

Setup Instructions

1. Deploy Web Form

  • Download the provided web form template
  • Host on your preferred platform
  • Copy both webhook URLs from your n8n workflow
  • Update form's webhook endpoints with your n8n URLs

2. Configure Image Conversion

  • Sign up at htmlcsstoimage.com
  • Get your API credentials (User ID + API Key)
  • Add to HTTP Request node as Basic Auth credentials

3. Connect OpenAI API

  • Create API key at OpenAI Platform
  • In the ChatGPT HTTP Request node, add Header parameter:
    • Key: Authorization
    • Value: Bearer YOUR_API_KEY
  • Recommended model: gpt-4 or gpt-3.5-turbo

4. Authenticate LinkedIn

  • Create LinkedIn OAuth2 credential in n8n
  • Follow the authentication flow and grant required permissions
  • Select the credential in the "Create a post" LinkedIn node
  • Choose post destination (personal profile or company page)

5. Test the Workflow

  • Submit test data through the web form
  • Monitor n8n execution panel for successful completion
  • Verify image generation, caption quality, and LinkedIn posting
  • Adjust settings as needed based on results

Notes

  • Processing time averages 10-20 seconds from upload to preview
  • All 6 design templates are fully responsive and LinkedIn-optimized
  • Caption editor allows full customization before publishing to LinkedIn

For questions or issues, please contact me for consulting and support : Linkedin.

🔗 Test with sample data first.

Access Web Form Template