Check Certificate Expiry
See valid-from and valid-to dates so you renew Let's Encrypt or commercial certs before browsers show warnings.
Vérificateur SSL
Vérificateur de certificat SSL de domaine
Vérifiez les certificats HTTPS de tout domaine — expiration, émetteur, version TLS et noms alternatifs en quelques secondes.
Type Domain
How It Works
Check SSL certificates in three simple steps
Whether you are launching a site or auditing HTTPS after a migration, our checker gives you instant certificate details.
Enter a hostname
Type any domain — e.g. hostpowr.com. We strip URLs and paths automatically for a clean TLS handshake.
Connect on port 443
Our server opens a secure TLS connection to the hostname and reads the certificate presented by the site.
Review certificate details
See issuer, expiry, alternate names, TLS protocol, and trust status in a clear, readable format.
Certificate Fields
Understand every SSL field
Not sure what a value means? Here is a quick reference for the certificate data we display.
Issuer
Certificate Issuer
The certificate authority (CA) that signed the certificate — e.g. Let's Encrypt or DigiCert.
Subject
Certificate Subject
The entity the certificate was issued to — usually the primary domain name.
SAN
Subject Alternative Names
Additional hostnames covered by the same certificate, such as www or subdomains.
TLS
TLS Protocol
The negotiated TLS version used for the connection — TLS 1.2 or 1.3 is recommended.
Trust
Trust Status
Whether the certificate chain is signed by a trusted public CA and passes standard validation.
Expiry
Expiry Date
When the certificate stops being valid. Browsers block sites with expired certificates.
FAQ
Common SSL questions
It connects to your domain on port 443 and reads the TLS certificate the server presents — the same certificate browsers use for the padlock icon.
Self-signed certificates, incomplete chains, hostname mismatches, or expired certs fail standard trust checks. The tool still shows details so you can diagnose the issue.
Yes — unlimited SSL checks, no account required. Built for HostPowr customers and anyone auditing HTTPS before launch or migration.
Every HostPowr hosting plan includes free Let's Encrypt SSL with automatic renewal. Use this checker to verify deployment after DNS changes.