Automate Instagram AI Comment Replies with n8n

What this workflow does

This workflow listens for new Instagram comments on posts about AI and automation.
It blocks comments made by the account owner.
Then, it uses AI to read each comment and make a smart reply in Brazilian Portuguese.
Finally, it posts that reply back to the Instagram comment.
This saves time and keeps engagement fast and relevant.

The workflow helps users avoid long manual answers and bad or slow responses.
The main goal is to keep the Instagram page active without work overload.

Input → Processing → Output

Inputs

• Instagram webhook: Sends comment updates including comment text, user info, and post ID.
  
• User IDs: To check if comment is from account owner.
  
• OpenRouter API key: For AI text generation.
  
• Instagram Graph API credentials: To get post data and send replies.
  

Processing Steps

• Verify webhook: Answer Instagram GET challenges to confirm ownership of webhook URL.
  
• Read comment data: Extract comment ID, text, user info, post ID from webhook.
  
• Filter out owner comments: Skip comments if commenter is the Instagram account itself.
  
• Get post context: Call Instagram API for the post caption or content to provide AI more information.
  
• Generate AI reply: Send comment and post info to Gemini 2.0 AI model via OpenRouter API with a prompt that decides if comment is question, praise, critic, or irrelevant.
  
• Post reply: Send AI-generated text as a reply comment on Instagram via the Graph API.
  

Output

A new comment reply on Instagram, made by AI, matching the comment’s tone and content.
Non-owner comments get thoughtful answers quickly.

Tools and services used

• n8n Workflow Automation: To build the automation and connect services.
  
• Instagram Graph API: To receive comment webhook data and post replies.
  
• OpenRouter API with Gemini 2.0 model: To analyze comment and generate reply in Brazilian Portuguese.
  
• HTTP Requests with header authentication: To communicate securely with Instagram API.
  

Beginner step-by-step: How to use this workflow in n8n production

Step 1: Download and import the workflow

1. Click the Download button on this workflow page to get the workflow file.
   
2. Open the n8n editor where you want to run this automation.
   
3. Use the menu option Import from File and select the downloaded workflow file.
   

Step 2: Configure credentials and settings

1. Add the Instagram Graph API credentials with permission to read comments and post replies.
   
2. Fill in the OpenRouter API key for the Gemini 2.0 language model.
   
3. Enter your Instagram account ID and verify tokens in the filter and webhook nodes to match your page.
   
4. If there are any URLs, IDs, or prompts in the workflow inputs, double-check they reflect your account or intentions.
   

Step 3: Test the workflow

1. Trigger a test comment on your Instagram post or simulate webhook data to watch the workflow run.
   
2. Check the execution logs to confirm each step works properly and a reply comment is sent back.
   

Step 4: Activate the workflow

1. After successful tests, toggle the workflow to active mode in n8n.
   
2. Make sure your webhook URL is publicly accessible so Instagram can send live comment events.
   
3. Keep API keys updated to prevent failures from expired tokens.
   

If using self hosting n8n for more control, see self-host n8n for setup options.

Customization ideas

• Change AI reply language or style by editing the prompt in the AI Agent node.
  
• Extend filters to ignore comments with certain words or spam patterns inside the Filter node.
  
• Add emoji reaction calls before replying based on sentiment analysis.
  
• Use other AI models supported by OpenRouter or integrate multiple AI endpoints.
  
• Duplicate workflow to manage multiple Instagram accounts by passing different IDs and credentials dynamically.
  

Common errors and fixes

• No webhook events: Usually means webhook URL is not public or verify token mismatch. Check URL accessibility and tokens in Instagram App and Respond to Webhook node.
  
• No AI replies or bad replies: Check OpenRouter API key and ensure prompt instructions are clear in AI Agent node.
  
• Replies not posting: Validate HTTP Request node settings. Check Instagram Graph API endpoints, token validity, and JSON body formatting.
  

Result summary

✓ Save hours by automating Instagram comment replies.
✓ Reply fast with AI-generated, context-aware answers.
✓ Keep audience engaged without manual work.
✓ Avoid replying to own comments and spam.
→ Increase Instagram interaction and follower trust.