SSL Certificate Checker
Use this free SSL certificate checker to see any website’s certificate expiry date, issuer and validity – no fake data, only live checks. Type in a domain for a live check from the public Certificate Transparency logs, or paste certificate details from your browser’s padlock.
Certificate status:
Issuer:
Valid from:
Valid to (expiry):
Days remaining:
Domain the certificate covers:
This checks the public certificate record – for the certificate your server actually serves, check the padlock in your browser. Nothing you type is saved or sent anywhere.
How to use this SSL certificate checker
Step 1: Type in a domain, with or without https, such as reviewkarts.com. The tool strips the scheme and any path, so a full address works just as well as a bare domain.
Step 2: Choose live check for a result from the public Certificate Transparency logs, or choose paste certificate details if you want to check a certificate you have in front of you. For the paste option, copy the details from your browser's padlock into the box.
Step 3: Press Check certificate and read the result. You see the status, the issuer, the valid from and valid to dates, the days remaining until expiry, and the domain the certificate covers, in plain words.
Worked example: checking reviewkarts.com
Checking reviewkarts.com gives a live result from the public logs. The certificate is Valid, and its issuer is Let's Encrypt. The valid from date is 3 October 2026, and the valid to, or expiry, date is 1 January 2027. On 9 November 2026, that left 52 days until expiry.
The certificate covers reviewkarts.com and www.reviewkarts.com, so both addresses share the same certificate. A result like this means visitors see a padlock, not a warning, and the connection is encrypted. If the expiry date had already passed, the status would read Expired, and the verdict would say how many days ago it expired.
If the checker cannot find a certificate for a domain, it says so plainly, with no made-up issuer or date. That can happen when a domain is spelled wrong, when the domain has no certificate at all, or when its certificate was never entered in the public logs. In that case, check the spelling, or check the address in your browser's padlock to see what your server actually serves.
What an SSL certificate does
An SSL certificate proves that a website is who it says it is, and it encrypts the connection between the visitor's browser and the server. Without a valid certificate, browsers show a warning, often with the words Not secure, and many visitors will leave rather than continue to a site they cannot trust.
The certificate is issued by a certificate authority, such as Let's Encrypt, after the authority has checked that the person asking for it controls the domain. The browser checks the certificate when a page loads: it confirms the issuer, the domain name, and the dates. If any of those checks fail, the browser warns the visitor instead of loading the page quietly.
Encryption matters even for a site that takes no payments and asks for no passwords. Without it, anyone on the same network could read what a visitor sends and receives. With a valid certificate, the connection is private, and the padlock tells the visitor that the site is the one they meant to visit.
When to renew
Renew a certificate before its expiry date, not after it. Most certificates last from 90 days to one year, and an expired certificate breaks the site for visitors, because browsers refuse to load it, or show a full-page warning. A certificate that expires overnight can take a site down for every visitor at once.
The safest time to renew is a few weeks before the expiry date, which leaves time to fix any problem with the renewal. Many hosts and certificate authorities renew automatically, and a 90-day certificate from Let's Encrypt is usually renewed by the server itself. Even so, it is worth checking the expiry date from time to time, because automatic renewal can fail, and a failed renewal is easy to miss until the certificate expires.
If a certificate has already expired, renew it at once, and check the site in a browser afterwards to confirm the padlock is back. Do not wait for visitors to report the problem, because by then some of them will already have left. A short check with this SSL certificate checker, once a month, is enough to catch an expiring certificate in good time.
Frequently asked questions
What is an SSL certificate?
An SSL certificate is a small digital file that proves a website's identity and encrypts the connection between the site and its visitors. It is issued by a certificate authority after checking that the owner controls the domain, and browsers check it every time a secure page loads.
How do I know if a certificate is expired?
Check its valid to date, which is its expiry date. If that date is in the past, the certificate is expired, and browsers will warn visitors. This checker shows the expiry date and the days remaining, so you can see at a glance whether a certificate is still valid.
What happens when a certificate expires?
Visitors see a warning, and many will not continue to the site. The site is not deleted, and its content is still there, but the connection is no longer trusted, because the certificate that proved the site's identity has run out. Renewing the certificate restores the padlock.
Where does this checker get its data?
From the public Certificate Transparency logs, the same public record browsers use. The live check looks up the newest certificate for the domain in those logs, through crt.sh and, if that does not answer, through the CertSpotter public log. Nothing here is invented, and if no certificate is found, the checker says so.
Is this exact?
It shows the newest certificate in the public logs. Your server may serve a different one, so check the browser padlock to confirm. A certificate that was never entered in the public logs will not appear here, even if your server serves it, so the padlock is always the final check.