ADEMN. home
Menu
Developer Tools · FREE ONLINE TOOL

SSL Checker

Inspect a public HTTPS certificate's names, issuer, validity dates, and time until expiry.

The URL you submit is sent to our server for public checks. Reports are not saved.

Public websites only. A domain without a scheme uses HTTPS. Checks run from our server.

A clearer view of your website

Check certificate dates, hostname matching, and trust for a public website.

A QUICK WALKTHROUGH

How to use SSL Checker

  1. Enter the public hostname whose HTTPS certificate you want to inspect.
  2. Select Check certificate to connect to the server and read the certificate it presents.
  3. Review the names, issuer, start and expiry dates, and remaining days. Treat certificate timing separately from trust and hostname validation.

What is SSL Checker?

An HTTPS server presents a TLS certificate during the connection handshake. This tool reads certificate details so you can check which names it lists, who issued it, and when its validity window starts and ends. The familiar name SSL Checker refers to this TLS certificate inspection; a current date window alone does not mean every browser will trust the certificate.

  • Inspect the certificate common name and alternate names
  • Read the issuer and validity start and end dates
  • Check days remaining until expiry
  • Inspect the certificate presented for the requested hostname

Dates are one part of certificate validity

A certificate can be within its date window and still have a hostname mismatch, an untrusted issuer, or an incomplete chain. Read any trust information separately from the date result. This tool does not provide a complete TLS configuration or revocation audit.

The result is a snapshot of the certificate presented to ADEMN's server. Load balancers, CDNs, and regional endpoints can present different certificates. Recheck after a renewal or deployment, and verify the endpoints your visitors actually use.

A practical example

INPUT
Illustrative input only: example.com
RESULT
Illustrative report layout, not a live certificate:
Common name and alternate names
Issuer
Valid from and valid until
Days remaining
Whether the date window includes the check time

Learn a little more

How to check the certificate a website actually serves
KEEP THINGS MOVING

Another task? Another tool.

Website Inspector

Check public DNS, HTTPS, redirects, response headers, and basic page signals in one report.

DeveloperFree

DNS Lookup

Look up public A, AAAA, CNAME, MX, NS, and TXT records for a domain.

DeveloperFree

Redirect Checker

Trace public HTTP and HTTPS redirects, with each response status, URL, and destination in order.

DeveloperFree

Frequently asked questions

Does a current certificate date mean HTTPS is trusted?

No. Dates, hostname matching, and certificate-chain trust are separate checks. A self-signed or mismatched certificate can have current dates and still cause a browser warning.

What do alternate names mean?

Subject Alternative Names list the hostnames or addresses covered by a certificate. Check the exact hostname users visit, including whether they use the www subdomain.

Why might the certificate differ from the one in my browser?

A site may serve traffic through several regional endpoints or load balancers. ADEMN inspects the certificate presented to its server at check time, which may differ from the endpoint your browser reaches.

Will the tool notify me before expiry?

No. This is an on-demand check with no scheduled monitoring or saved report. Your hostname is sent to ADEMN's server to perform the TLS connection; browser cookies and Authorization headers are not forwarded.