n8n SEO Blog Generator: SerpAPI + Gemini + Replicate Workflow

Turn a blog topic into a published-ready SEO post—automatically

This n8n SEO Blog Generator workflow takes a “Research Query” topic, pulls relevant Google results via SerpAPI, writes a complete SEO blog post with Google Gemini, generates a featured banner image through Replicate, and emails the final HTML and image using Gmail.

What this workflow does

• Receives a form submission containing a “Research Query” blog topic.
• Researches Google using SerpAPI, then formats organic results into a cleaned research summary with titles, snippets, and links.
• Writes the SEO blog post with Google Gemini, including a generated slug, SEO title, and meta description.
• Creates a featured image: builds a detailed image prompt from the blog content and sends it to Replicate to generate a single blog banner image.
• Prepares deliverables: combines the generated blog HTML, SEO metadata, and the image URL, then converts the HTML into an email-ready format.
• Sends the result to a specified recipient address via Gmail, including the blog content and featured image.

Use cases

• SaaS teams that want consistent SEO blog content without manual research and drafting.
• n8n builders and automation engineers creating an AI-assisted content pipeline from a topic form submission.
• Marketing operators who need HTML-ready emails containing both text and a generated banner image.

Technical details

• SerpAPI for Google search results and organic snippet summarization.
• Google Gemini (AI agent using the Gemini chat model) to draft the full blog and generate SEO fields (slug, SEO title, meta description).
• Replicate to create a featured image (optionally keeping a Prefer: wait header for synchronous generation).
• n8n nodes/tools: set, code, html, gmail, merge, aggregate.