macOS Captive Portal Preview

Preview and test your captive portal in an authentic macOS CNA (Captive Network Assistant) window environment at 900×572px resolution. Load via URL or paste HTML source directly to bypass mixed content restrictions.

URL *

Network Name

Instructions

Enter an HTTPS URL and click Preview. The page must allow iframing (no X-Frame-Options or CSP restrictions).

Important Notes:

HTTPS URLs only — browsers block HTTP content inside an HTTPS page (Mixed Content policy)
Some websites block iframing via X-Frame-Options or CSP headers
Use Paste HTML mode to preview local HTTP servers without any restrictions