Free SSL Certificate Checker
Check any website’s SSL certificate in seconds — expiry date, days remaining, issuer, and trust status. Then get free alerts before it expires.
Free · no sign-up · checks the live certificate the server presents.
What you get
What this SSL checker tells you
Enter a domain and Uptura reads the live certificate the server presents, then reports exactly four things — no noise.
Expiry date
The exact date the certificate stops being valid — read straight from the certificate the server presents.
Days remaining
How long until it expires, at a glance, so you know whether a renewal is overdue or comfortably ahead.
Issuer
Which certificate authority issued it — e.g. Let's Encrypt, Google Trust Services, or DigiCert.
Trust status
Whether the certificate is trusted and valid, or has a problem such as being expired, self-signed, or untrusted.
Why it matters
Why you should check your SSL certificate expiration
An expired certificate isn't a warning — it's an outage. Here's why a one-time check is only half the job.
Expired certs take the whole site down
The moment a certificate expires, browsers block the site with a full-page "Your connection is not private" warning. Visitors can't get past it — checkout, sign-ups, and API calls all stop.
It always happens at the worst time
Certificates expire on a fixed date regardless of weekends or holidays. A one-time check tells you where you stand today — but the risk is the renewal you forget three months from now.
Manual checks don't scale
Checking one domain by hand is easy. Remembering to re-check every domain, subdomain, and API endpoint on the right day, every 90 days, is where it breaks down.
From checker to monitor
Turn a one-time check into continuous SSL monitoring
The checker tells you where a certificate stands today. Uptura's free SSL certificate monitoring watches every domain for you and alerts you before one expires.
- 1
Add your domains
Point Uptura at the sites and endpoints you care about. Free during our public beta — no credit card.
- 2
We check the certificate for you
Uptura reads each certificate on a schedule and tracks its expiry, issuer, and trust status — the same check you just ran, running for you automatically.
- 3
You get alerted before it expires
As a certificate nears expiry (within 14 days) Uptura sends a warning to email and Slack, so you renew before anyone hits an error page.
Free during our public beta, no credit card required. Prefer to read more first? See how SSL monitoring works.
FAQ
SSL certificate checking, answered
How do I check if an SSL certificate is valid?
Enter a domain above and Uptura connects to it over HTTPS, reads the certificate the server presents, and reports whether it's trusted and valid along with its expiry date and issuer. A "valid" result means the certificate is in date and trusted by browsers; a problem result means it's expired, self-signed, or otherwise untrusted.
How do I check when my SSL certificate expires?
Type your domain into the checker and it shows the certificate's exact expiry date and the number of days remaining. It's the fastest way to check an SSL certificate's expiration date without running openssl commands in a terminal.
What happens when an SSL certificate expires?
As soon as a certificate expires, browsers stop trusting it and block the site with a warning like "Your connection is not private" (NET::ERR_CERT_DATE_INVALID). Visitors can't reach your pages, forms and checkouts fail, and API clients reject the connection — so an expired certificate effectively takes the site down until it's renewed.
Is this SSL certificate checker free?
Yes — the checker is completely free and needs no sign-up. Check as many certificates as you like. If you'd rather not remember to re-check them, you can set up free automated SSL monitoring during our public beta.
Can I get alerts before my SSL certificate expires?
Yes. A one-time check tells you where a certificate stands today, but the real risk is the renewal you forget. Add your domains to Uptura and it monitors each certificate for you, sending an alert to email and Slack as it nears expiry (within 14 days) — free during our public beta.
How often should I check my SSL certificate?
Certificates from providers like Let's Encrypt are valid for 90 days, and even paid certificates auto-renew imperfectly, so a good rule is to verify well before each renewal. Rather than putting a reminder in your calendar, continuous monitoring checks every certificate on a schedule and only pings you when one is actually close to expiring.
How do I renew an SSL certificate?
It depends on your provider: with Let's Encrypt, tools like Certbot renew automatically if configured; with a paid CA you reissue the certificate from your host or dashboard and install the new one. The hard part isn't the renewal itself — it's knowing it's due. Monitoring closes that gap by warning you in time to act.
Why does my certificate show as untrusted or "not secure"?
The most common causes are an expired certificate, a self-signed certificate, a missing intermediate in the chain, or a hostname that doesn't match the certificate. The checker reports the certificate's trust status so you can see whether browsers will accept it before your visitors run into the warning.
Never get caught by an expired certificate again
Add your domains and let Uptura watch every SSL certificate for you — free during our public beta, no credit card required.
Free during beta · no credit card required