🧑‍🦯Improve your Website Accessibility with GPT-4o and Google Sheet

Tags: Accessibility, SEO, Blogging, Marketing, Automation, AI, Web Auditing

Context

Hey! I’m Samir, a Supply Chain Engineer and Data Scientist from Paris, and the founder of LogiGreen Consulting.

In my personal blog, I share insights on how to use AI, automation, and data analytics to improve logistics, operations, and digital sustainability practices.

Have you heard about accessibility?

In this workflow, I use n8n to improve the quality of alternative texts for images on my personal website.

📬 For business inquiries, you can connect with me on LinkedIn

Who is this template for?

This workflow is for:

• Bloggers and website owners who want to improve accessibility
• SEO professionals looking to boost page performance
• Web developers and product teams automating web audits

What does it do?

This n8n workflow:

1. 🔍 Downloads the HTML of a blog or web page
2. 🖼️ Extracts all <img> tags and their alt attributes
3. 📉 Detects missing or too-short alt texts
4. 🤖 Sends those images to GPT-4o (with vision) to generate new alt descriptions
5. 📄 Saves the results into a Google Sheet, updating the alt text when needed

How it works

1. Set a page URL using the Set node
2. Download HTML content
3. Extract image src and alt using a Code node
4. Store results in a Google Sheet
5. Filter images with altLength < 50
6. Send image URL to GPT-4o
7. Update the Google Sheet with the newly generated newAlt text

The AI alt texts are concise, descriptive, and accessibility-compliant.

What do I need to get started?

You’ll need:

• A Google Sheet to store the audit results
• An OpenAI account with GPT-4o access

Follow the Guide!

Follow the sticky notes in the workflow or check my tutorial to configure each node and start using AI to improve the accessibility of your website.

🎥 Watch My Tutorial

Notes

• GPT-generated alt texts are limited to ~125–150 characters for best results
• Use this to comply with WCAG and improve Google indexing
• Easily adapt it to audit multiple domains or e-commerce catalogues

This workflow was built using n8n version 1.85.4
Submitted: April 21, 2025