SSL certificate checker

Inspect certificate health, expiration windows, issuers, and domain coverage before certificate problems reach production.

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Why SSL still matters

Encryption

HTTPS encrypts traffic between the browser and origin so traffic is harder to intercept or tamper with.

Trust

Certificates help browsers validate identity and reduce the warning signals associated with untrusted or misconfigured sites.

Search performance

Secure delivery is part of the baseline quality expected by users, browsers, and search engines.

Common certificate failures

Certificate expired

NET::ERR_CERT_DATE_INVALID

The certificate validity window has ended and the site needs renewal before browsers trust it again.

Hostname mismatch

NET::ERR_CERT_COMMON_NAME_INVALID

The requested hostname does not match the subject names covered by the certificate.

Untrusted issuer

NET::ERR_CERT_AUTHORITY_INVALID

The browser does not trust the issuing CA, or the certificate is self-signed in a context that expects a public CA.

Frequently asked questions

What is the difference between free and paid SSL certificates?

For most websites, the core encryption strength is similar. Paid certificates typically differ in validation depth, support, or business assurances rather than raw HTTPS capability.

Why are some certificates only valid for 90 days?

Shorter lifetimes reduce exposure when keys are compromised and encourage automation. That is why modern certificate workflows rely on automatic renewal.

Want SSL managed automatically?

DeployPages provisions and renews certificates for supported custom domains so teams do not have to babysit expiry windows manually.

See managed SSL