HTTPS & HSTS Checker

HTTPS availability, HTTP-to-HTTPS redirect and HSTS preload status

Free Online Tool

HTTPS & HSTS Checker — Complete Guide & Instructions

Check whether a domain answers over HTTPS, whether plain HTTP redirects to HTTPS, and whether its Strict-Transport-Security header meets the hstspreload.org requirements — max-age of one year, includeSubDomains and the preload flag.

How to Use HTTPS & HSTS Checker

  1. 1 Enter a domain name.
  2. 2 Click Check — the tool probes both http:// and https:// endpoints.
  3. 3 See the redirect verdict plus a parsed HSTS report with preload eligibility.

Key Features & Capabilities

  • HTTPS availability and response status.
  • HTTP→HTTPS redirect detection and destination.
  • Parsed HSTS header — max-age, includeSubDomains, preload.
  • Preload eligibility verdict based on hstspreload.org rules.