What is SSL certificate monitoring?

SSL certificate monitoring automatically checks whether your website or API still presents a valid TLS certificate, tracks the expiry date, and notifies you by email before visitors see browser security warnings.

How does SSL Monitor alert me before a certificate expires?

SSL Monitor runs continuous HTTPS checks on your domains. When a certificate approaches expiry or a check fails, you receive a timely email alert so you can renew or fix the issue before it affects users.

Can I monitor multiple domains?

Yes. Every account includes free monitoring for 5 domains. You can add more domains and upgrade your plan on the pricing page when you need higher limits.

Never miss an SSL expiry again

We check your TLS certificates around the clock and email you before they expire — or the moment something fails.

5 domains free · No credit card required

SSL certificate monitoring for websites and APIs

SSL Monitor is an online service that watches your HTTPS (TLS) certificates so expired or misconfigured SSL never takes your site offline. Whether you run a marketing site, a SaaS product, or internal APIs, we verify that each hostname still serves a trusted certificate and alert you when renewal is due or a check fails.

Unlike manual calendar reminders, monitoring runs automatically in the background — so teams in Europe, the US, and beyond get the same reliable coverage without logging into servers daily.

Why teams use SSL Monitor for certificate expiry alerts

Continuous checks — we probe your endpoints on a regular schedule, not just once a month.
Email alerts that matter — notifications when renewal is approaching, after expiry, or when TLS handshakes fail.
Simple setup — enter a domain, sign up with email or Google, and monitoring starts without installing agents.
Built for operators — developers, agencies, and IT managers who need one place to track many hostnames.

Expired certificates cause browser warnings, broken checkout flows, and API outages. Proactive SSL monitoring turns that risk into a manageable reminder — see our pricing for higher domain limits.

Frequently asked questions about SSL monitoring

What is SSL certificate monitoring?: It is automated checking that your site or API still presents a valid TLS certificate, combined with alerts before the certificate expires or when HTTPS stops working.
What happens if my SSL certificate expires?: Browsers and clients show security warnings or refuse the connection. Monitoring gives you lead time to renew with your certificate authority (e.g. Let's Encrypt) before customers are affected.
Do I need to install software on my server?: No. SSL Monitor performs external HTTPS checks — you only add the hostname you want watched.
How do I get started?: Enter your domain on this page, create a free account, and we begin monitoring after sign-up. Add more domains from your dashboard anytime.