CORS Header Checker

Paste HTTP response headers. Structured breakdown of CORS configuration. No data leaves your browser.

HTTP Response Headers

Checked locally in your browser.

Built by Sprint19. Product engineering for startups.

This tool interprets CORS headers from pasted text and does not make network requests or perform security assessment.

© 2026 Sprint19. Code licensed under MIT. Sprint19 name and branding may not be used without permission.