On-Page SEO Audit Generator using AI - n8n Workflow

• SEO Managers needing instant page analysis.


• Digital marketers running conversion rate optimization (CRO) experiments.


• Consultants who deliver fast, structured audit reports.


• Agencies looking for reusable n8n templates for client services.

This advanced n8n workflow transforms manual SEO auditing into an instant, automated process. By leveraging the power of OpenAI's large language models (LLMs) via the Langchain Agent n8n node, this solution performs two parallel, expert-level reviews: a Technical Audit and a Content Audit. This particular n8n workflow solves the problem of slow analysis by providing structured, actionable recommendations—categorized into Critical Issues, Quick Wins, and Opportunities—delivered directly to your inbox. This is a highly valuable n8n automation for anyone serious about optimizing landing pages and boosting search rankings, making it one of the most practical n8n templates available for digital professionals. Every n8n node is configured for maximum efficiency.

This robust n8n workflow begins with an n8n trigger using the Form Trigger n8n node, requiring the user to input the target landing page URL.

1. Data Acquisition: The subsequent n8n node, "Scrape Website" (an HTTP Request), fetches the entire HTML content of the provided URL.


2. Parallel AI Analysis: The n8n workflow splits into two parallel paths:

1. Merging and Formatting: Results are combined using the Merge n8n node, aggregated, and then meticulously structured using the Markdown n8n node. This ensures a clean, readable HTML output ready for email delivery.


2. Delivery: Finally, the comprehensive SEO report is sent via the Gmail n8n node to the specified recipient, concluding this powerful n8n automation.

To implement this n8n workflow, follow these steps:

1. Import: Download the provided n8n workflow JSON and import it into your self-hosted or cloud n8n instance.


2. OpenAI Credentials: Locate the OpenAI Chat Model n8n node and the OpenAI Chat Model1 n8n node. Add your OpenAI API Key credentials to both connections. For superior results, ensure you select a powerful model like gpt-4o as recommended by the sticky note in the n8n template.


3. Gmail Setup: Configure the Gmail n8n node credentials. Update the "Send To" field in the Gmail n8n node parameters with the desired recipient email address for receiving the final audit report.


4. Activation: Once all credentials and settings are configured, activate the n8n trigger (Landing Page Url n8n node) to expose the public form endpoint and start using this sophisticated n8n template.

Landing Page Url (Form Trigger n8n node): Serves as the starting n8n trigger. It collects the necessary URL input from the user via a simple form interface.
Scrape Website (HTTP Request n8n node): This n8n node’s function is to retrieve the full HTML source code of the URL dynamically passed from the trigger, providing the data payload for the AI analysis.
Technical Audit (Langchain Agent n8n node): Utilizes an expert prompt to analyze the scraped HTML for technical SEO factors. Key Configuration: It connects to an lmChatOpenAi n8n node and is programmed to structure its output into Critical Issues, Quick Wins, and Opportunities.
Content Audit (Langchain Agent n8n node): This n8n node uses a separate, equally expert prompt to evaluate content quality, keyword usage, and readability metrics. Key Configuration: It structures its output into detailed Analysis and actionable Recommendations.
Merge and Aggregate n8n nodes: These essential core logic n8n nodes combine the parallel results from the two independent AI audit branches into a single item list, preparing them for final, cohesive formatting.
Markdown n8n node: Function is to format the raw text audit reports received from the AI agents into a visually appealing Markdown structure, which is then converted to HTML suitable for email delivery.

• Gmail n8n node: The final action n8n node in this n8n workflow. It sends the comprehensive, formatted HTML audit report, ensuring the subject line includes the audited URL for easy reference.