AI SEO Blog Writer Automation in n8n — Build It in 30 Minutes [2026]

Introduction

Writing long, AI SEO-optimized blog posts usually takes hours of research, outlining, writing, and metadata preparation.

This n8n workflow turns that entire process into an automated system.

Once set up, it:

• Pulls blog ideas from Google Sheets
  
• Researches search intent and keywords
  
• Improves the blog title
  
• Generates outlines, key takeaways, and full content
  
• Creates SEO metadata and featured image prompts
  
• Prepares the blog draft for publishing

All of this runs automatically on a schedule using n8n.

What This Workflow Does (High Level)

In simple words

You maintain a Google Sheet with blog ideas marked as Pending.

n8n picks one idea, researches it, writes a full SEO blog post using AI, and prepares everything needed to publish.

No manual writing.
No copy-paste chaos.

Tools Used in This Workflow

• Google Sheets
  
• Perplexity AI
  
• OpenRouter (Claude Sonnet)
  
• ImageBB
  
• n8n LangChain Agents

Step-by-Step: How to Build This Workflow in n8n

Step 1: Trigger the Automation

Node: Schedule Trigger

What it does
Runs the workflow automatically on a time schedule.

Why it’s needed
So blog generation happens daily, weekly, or whenever you want—without manual clicks.

How to set it up

1. Add Schedule Trigger
2. Choose interval (daily / weekly)
3. Save

Input: Time rule
Output: Triggers workflow execution

Step 2: Fetch Blog Ideas from Google Sheets

Node: Google Sheets – “Get post titles”

What it does
Fetches blog titles marked as Pending from your sheet.

Why it’s needed
This is your content backlog.

How to set it up

1. Connect Google Sheets credentials
2. Select document + sheet
3. Filter: Status = Pending

Input: Sheet rows
Output: Blog title + keywords

Step 3: SERP & Keyword Research

Node: SERPs, Writing, KWs, Insights (AI Agent)

What it does
Analyzes:

• Search intent
  
• Writing style & tone
  
• Keywords (primary, secondary, long-tail)
  
• Target audience
  
• Article goal

Why it’s needed
SEO content fails without search intent clarity.

Input: Blog title + keyword
Output: Structured SEO research JSON

Step 4: Clean Research References

Node: Cleanup Links (Set)

What it does
Replaces numbered citations with readable sources.

Why it’s needed
Makes AI research usable in long-form content.

Input: AI research text
Output: Clean research block

Step 5: Refine the Blog Title

Node: Refine the Title (AI Agent)

What it does
Creates a high-CTR SEO title under 55 characters.

Why it’s needed
Titles decide clicks.

Input: Old title + keywords + intent
Output: Optimized title (JSON)

Step 6: Parse the AI Output Safely

Node: Structured Output Parser

What it does
Ensures AI returns valid JSON only.

Why it’s needed
Prevents workflow breaking due to formatting errors.

Step 7: Store the New Title

Node: Set Post New Title

What it does
Saves the refined title for later steps.

Blog Content Creation Phase

Step 8: Generate Key Takeaways

Node: Key Takeaways AI Agent

What it does
Creates:

• Intro paragraph
  
• Bullet key takeaways
  
• Outro bridge

Why it’s needed
Improves readability and featured snippet chances.

Step 9: Create Blog Outline

Node: Outline Agent

What it does
Builds a detailed H2 / H3 structure.

Why it’s needed
Long blogs need structure before writing.

Step 10: Save Outline

Node: Set Post Outline

Stores outline + word limit.

Step 11: Write the Full Blog Content

Node: Post Content Writer Agent

What it does
Writes:

• Introduction
  
• Body sections
  
• Conclusion
  
• Examples + SEO optimization

Why it’s needed
This is the actual blog draft.

Output: 2000+ word article in Markdown

Step 12: Save Draft

Node: Set Draft Post

Stores the final article body.

SEO Metadata & Image Generation

Step 13: Generate SEO Meta

Node: Post Meta Agent

What it does

• SEO title
  
• Meta description
  
• Featured image prompt

Step 14: Parse SEO Metadata

Node: Structured Output Parser

Ensures clean JSON.

Step 15: Convert AI Image to File

Nodes:

• Set Base64
  
• Convert to File

Step 16: Upload Image

Node: HTTP Request (ImageBB)

Uploads featured image and returns public URL.

Workflow Completion

At this point, you have:

• SEO title
  
• Meta description
  
• Featured image
  
• Full blog content
  
• Keywords & research

Ready to push to CMS, Notion, Webflow, WordPress, or Airtable.