CORS Header Generator - Free Online SEO Tool

The CORS Header Generator is a free online tool that helps developers generate correct CORS (Cross-Origin Resource Sharing) headers for their web servers based on their exact configuration needs. Instead of manually researching syntax for each server platform, this tool instantly produces ready-to-use code for Apache, Nginx, Node.js (Express), or PHP, saving time and preventing frustrating cross-origin errors.

Key Features

• Allowed Origins field lets you specify a wildcard (*) for all domains or a specific domain like https://example.com
• Allowed Methods and Allowed Headers fields let you define which HTTP methods and headers, such as Content-Type and Authorization, are permitted
• Max Age (seconds) setting controls how long browsers can cache preflight response results
• Allow Credentials option enables the Access-Control-Allow-Credentials: true header for requests requiring cookies or authentication
• Server Type selector generates tailored output for Apache (.htaccess), Nginx, Node.js (Express), or PHP

How to Use This Tool

• Enter your Allowed Origins, Allowed Methods, and Allowed Headers based on your application's requirements
• Set the Max Age value and toggle Allow Credentials if needed
• Select your Server Type, such as Apache, Nginx, Node.js, or PHP
• Generate the output and copy the resulting configuration, such as Header set Access-Control-Allow-Methods, directly into your server config or code

Best Practices

Avoid using a wildcard (*) for Allowed Origins when Allow Credentials is enabled, since browsers block this combination for security reasons—specify an exact domain instead. Only include the HTTP methods and headers your application actually needs to reduce your attack surface. Test your generated CORS headers in a staging environment before deploying to production to confirm cross-origin requests work as expected.

This CORS header generator eliminates guesswork and syntax errors, helping developers quickly fix cross-origin issues and configure secure, functional APIs across Apache, Nginx, Node.js, and PHP environments.