SSL Certificate Checker

Validate your certificates and get warned well before they expire.

An expired SSL certificate breaks your site instantly and loudly: every visitor hits a full-screen browser warning, and trust evaporates in seconds. It is one of the most avoidable outages there is, yet it happens constantly because the renewal date sat in someone's head instead of a monitor. An SSL checker validates your certificate and counts down to expiry so you are never caught out.

What it checks
  • Certificate expiry date, with advance warnings before it lapses
  • Whether the certificate is valid, trusted and correctly installed
  • A complete, correctly ordered certificate chain
  • Hostname mismatches between the certificate and your domain
  • Weak or deprecated protocols and cipher configurations

Why it matters

A lapsed certificate doesn't degrade your site gracefully — it takes it down for everyone at once, often over a weekend. Auto-renewal helps but fails silently more often than people expect, so the only safe approach is independent monitoring that warns you while there is still time to act.

How BrandSentryPro does it

Add your site as a monitor and BrandSentryPro checks its certificate continuously, alerting you days before expiry and the moment anything about the certificate becomes invalid — so a renewal never slips through.

Frequently asked questions

How do I check when my SSL certificate expires?
An SSL checker reads the certificate served by your site and reports its expiry date. BrandSentryPro monitors it continuously and sends advance warnings, so you renew before it lapses rather than after.
What happens when an SSL certificate expires?
Browsers show a full-page security warning and block access to your site, and APIs that connect to it start failing. The outage affects every visitor at once until the certificate is renewed.
Does auto-renewal mean I do not need to monitor SSL?
No. Auto-renewal can fail silently — a misconfiguration, a failed validation, or an expired payment method — and you only find out when the site goes down. Independent monitoring is your safety net.
All in one place

Run this check automatically

Add a monitor and BrandSentryPro keeps every check running for you — with alerts the moment something needs attention.

Get started