SSL Checker
FreeCheck SSL certificate validity, expiry and chain
About SSL Checker
An expired or misconfigured TLS certificate can take a site offline or scare away every visitor with a browser warning, and these failures usually strike without notice. This SSL Checker inspects the certificate on any domain and reports the essentials: validity dates, days until expiry, the issuer, the covered hostnames, and whether the chain back to a trusted root is complete.
Enter a domain and ToolHub by Codaiman fetches and parses its certificate, surfacing problems like an expired cert, a hostname mismatch, or a missing intermediate before your users hit them. It is free, requires no signup, and gives you a quick read on certificate health whenever you deploy, renew, or troubleshoot HTTPS for a site you manage.
Common uses
- Confirming a certificate renewal actually went live on your domain
- Checking how many days remain before a certificate expires
- Diagnosing a browser trust warning caused by a missing intermediate
- Verifying a cert covers the right hostnames and subdomains
- Spot-checking SSL health after a deployment or DNS change
How to use
- 1
Configure options
Set your preferences using the options panel below.
- 2
Click Generate
Click the process button to generate your result instantly.
- 3
Copy or download
Copy the result to clipboard or download it directly to your device.
Why ToolHub?
- Industry-standard algorithms
- No data retention
- OWASP-aligned checks
FAQ
Does it check the full certificate chain?
Yes. It reports on the chain back to a trusted root, which helps catch missing intermediate certificates, a common cause of trust errors on some clients.
Why does it say expiring soon when my browser shows no warning?
Browsers warn only once a certificate is actually expired or invalid. This tool flags upcoming expiry early so you can renew before users ever see an error.
Can it test a server on a non-standard port?
It checks the certificate served for the domain you enter. For internal hosts or unusual ports, behavior depends on whether the endpoint is publicly reachable.
Can I use SSL Checker on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.