What happens if my SSL certificate expires?

Browsers show a full-page security warning to every visitor, APIs reject connections, and many apps stop working entirely. Traffic and sales drop to near zero until the certificate is renewed.

Do auto-renewing certificates still expire unexpectedly?

Yes. Let's Encrypt certificates renew every 60-90 days, and renewal fails silently whenever DNS changes, the ACME challenge breaks, or a deployment misconfigures the server. An expiry monitor is the safety net that catches those silent failures.

Does this work with any website or only certain platforms?

Any website or API endpoint. Certificate checks happen at the TLS layer, so WordPress, Shopify, Webflow, static sites and hand-rolled servers all work identically. Nothing is installed on your server.

Free tool · no signup

SSL certificate expiry monitor — catch it before your visitors do

Q: How do I check when my SSL certificate expires?

Enter your URL in the checker above, or run: openssl s_client -connect example.com:443 -servername example.com 2>/dev/null | openssl x509 -noout -enddate. DeskUptime does this automatically on a schedule and alerts you before expiry.

An expired certificate means a full-page browser warning, broken APIs and lost traffic. Check any domain below for free — then let DeskUptime watch it daily and alert you before it happens.

Check a domain now See DeskUptime →

Free SSL expiry checker

Enter any public URL. We read the certificate's not-after date straight from the TLS handshake.

Website URL

Prefer the terminal? Run the same check yourself:

openssl s_client -connect example.com:443 -servername example.com 2>/dev/null \
  | openssl x509 -noout -enddate

Why certificates still expire in 2026

Auto-renewal solved most of this — until it quietly stops working.

Silent renewal failures

DNS changes, moved servers and broken ACME challenges all fail without an error you'll see. You find out from a visitor — or a browser warning.

Shorter certificate lifetimes

Let's Encrypt certs last 90 days and the industry is moving shorter still. More renewals per year means more chances for one to fail.

Nobody owns the checklist

On small teams, "someone renews the cert" is everyone's job — so it's nobody's. A monitor makes the deadline visible.

A one-time check isn't monitoring

Checking today tells you nothing about the day your renewal fails three weeks from now.

	Manual check	Cron script	DeskUptime
Runs automatically	✗	✓ (if you maintain it)	✓
Alerts before expiry	✗	You build it	✓ built-in thresholds
Uptime & content-change checks too	✗	You build it	✓ included
Server to maintain	—	Required	None — runs on your machine
Monthly cost	Your time	~$5 server	$0 after $19 one-time

DeskUptime is a desktop app: your URLs are checked from your own machine and never touch our servers. One-time $19, no subscription.

Get DeskUptime — $19 once

FAQ

How do I check when my SSL certificate expires?

Use the checker above, or run openssl s_client -connect example.com:443 -servername example.com 2>/dev/null | openssl x509 -noout -enddate. DeskUptime automates exactly that check on a schedule and alerts you ahead of time.

Do auto-renewing certificates still fail?

Yes — that's the trap. Let's Encrypt renewals break silently when DNS changes, the ACME challenge can't complete, or a deploy reconfigures the server. Everything looks fine until the cert runs out.

How far in advance should I be warned?

Two to four weeks is comfortable: enough to fix a broken renewal flow, wait out registrar delays, or escalate to whoever controls DNS. DeskUptime lets you set the threshold.

Does it work with any website?

Yes. TLS certificate checks are platform-independent — WordPress, Shopify, Webflow, Squarespace, static hosts and API endpoints all behave identically. No agent or plugin is installed anywhere.

Can I check internal or non-public domains?

The web checker only reaches public URLs. The DeskUptime desktop app and CLI check anything your machine can reach — staging domains, intranet hosts, localhost services.