CORS checker is an Astrina tool for website security and configuration. Which origins your endpoint allows. It fetches the target page from our servers and returns results in a few seconds.
How to use CORS checker
- Enter the URL you want to analyse.
- Click "Run the check."
- Review the results — each item is explained.
- Fix any issues and re-run to confirm.
What CORS checker is used for
Professionals working in website security and configuration use this tool to save time and catch errors before they become problems. Common use cases:
- Auditing and quality checks in website security and configuration
- Validating or converting output before deploying
- Debugging issues quickly without switching between multiple tools
- Generating boilerplate output to speed up development
Key features
- Fast: server-side analysis in seconds
- Free for most use cases — no account required for the majority of checks
- Accurate: uses the same techniques as professional SEO and security scanners
- Privacy-friendly: we do not store the content we analyse beyond the session
About this tool
This is part of Astrina's suite of 12 website security and configuration tools. All tools are available at astrina.io/utilities.
Frequently asked questions
Is CORS checker free?
The tool is free to use for basic runs. Daily limits apply for server-side tools without an account; a free account raises those limits.
Do I need an Astrina account?
For most checks, no account is needed. An account is required for higher usage limits or paid features.
Can I use CORS checker through the API?
Yes. This tool is available through the Astrina REST API with your API key. See /api/ for documentation.
How accurate is CORS checker?
The tool uses the same techniques as professional SEO and security scanners. Results reflect what search engines and browsers actually see.
Try the CORS checker now — no account required for most checks, and the result is ready in seconds.
The core counter is free. Add your site and explore every feature.
What this page answers
- SEO
- SEO guide
- CORS checker — Free Security Tool
- CORS checker — Free Security Tool guide
- CORS checker — Free Security Tool explained
- CORS checker — Free Security Tool tutorial
- getting started with CORS checker — Free Security Tool
- CORS checker — Free Security Tool best practices
- CORS checker — Free Security Tool step by step
- what is CORS checker — Free Security Tool
- CORS checker — Free Security Tool for beginners
- CORS checker — Free Security Tool checklist
- CORS checker — Free Security Tool examples
- why CORS checker — Free Security Tool matters
