ToolAdda

🔒 Security

Real-time inspection

SSL Certificate Checker

Check any website's SSL certificate online — expiry date, issuer, TLS grade, and endpoint security in seconds. Free SSL test with no sign-up required.

Live status
Ready
No data stored in the browser
SSL GradeSee certificate strength at a glance and understand the trust level instantly.
Certificate DetailsInspect issuer, expiry and SAN data without leaving the page.
Responsive DesignThe experience adapts smoothly for mobile, tablet and desktop screens.
Note: This tool runs in your browser and queries public certificate data with a fallback proxy when direct access is blocked.

What is an SSL Checker?

An SSL checker (also called an SSL certificate checker or SSL test) is a tool that inspects the SSL/TLS certificate installed on a website. It tells you whether the certificate is valid, when the SSL certificate expires, who issued it, which domains it covers, and how strong the server's TLS configuration is. ToolAdda's free SSL Checker runs the test online in seconds — just enter a domain and click Check.

How to check an SSL certificate

  1. Enter your domain (e.g. example.com) — no https:// needed.
  2. Click Check and wait a few seconds for the analysis.
  3. Review the TLS grade, certificate expiry date, and issuer.
  4. Fix any highlighted issues like expired certificates or weak protocols.

Why check your SSL certificate regularly?

  • Avoid downtime: an expired certificate shows scary browser warnings and drives visitors away.
  • Protect SEO: Google uses HTTPS as a ranking signal — broken SSL hurts rankings.
  • Catch misconfigurations: incomplete chains, hostname mismatches, and weak ciphers are easy to miss.
  • Build trust: a valid certificate with a strong grade reassures users and customers.

What the SSL test reports

  • SSL grade — overall TLS security rating from A+ to F.
  • Certificate expiry — exact date your SSL certificate expires.
  • Issuer — the certificate authority (CA) that signed the certificate.
  • SAN entries — every domain and subdomain the certificate covers.
  • Endpoint details — protocol versions and server configuration.

Common SSL certificate errors

  • Certificate expired — renew with your CA or hosting provider.
  • Hostname mismatch — certificate issued for a different domain.
  • Incomplete chain — intermediate certificates missing on the server.
  • Self-signed certificate — not trusted by browsers; use a trusted CA like Let's Encrypt.

Frequently asked questions

How do I check when my SSL certificate expires?

Enter your domain in the SSL Checker above and click Check. The results show the exact expiry date along with the issuer and validity period, so you can renew before it lapses.

Is this SSL checker free to use?

Yes. ToolAdda's SSL Checker is completely free with no sign-up, no installation, and no limits for normal use.

What does an SSL grade mean?

The SSL grade (A+ to F) summarizes how secure a server's TLS configuration is, based on protocol versions, certificate strength, key exchange, and cipher support. An A or A+ indicates a strong, modern setup.

Does SSL Checker upload or store my data?

No. The tool only queries public TLS report data for the domain you enter, and the domain string is not stored on ToolAdda's servers.

Can I check any public website's SSL certificate?

Yes. You can analyze any publicly reachable domain, including subdomains. Private, internal, or firewalled hosts cannot be scanned.

Why is my SSL certificate showing as invalid or expired?

Common causes include an expired certificate, a hostname mismatch, an incomplete certificate chain, or a self-signed certificate that browsers don't trust. The checker highlights these issues so you can fix them.

What is the difference between SSL and TLS?

TLS (Transport Layer Security) is the modern successor to SSL (Secure Sockets Layer). SSL is deprecated, but the name stuck — today an "SSL certificate" actually secures connections using TLS 1.2 or TLS 1.3.

How long does an SSL check take?

Initial scans may take up to 30 seconds while the endpoint is analyzed; cached results typically return within a few seconds.

How often should I run an SSL test?

Check monthly, and always after renewing a certificate or changing your server or CDN configuration. Set a reminder at least 30 days before your certificate's expiry date.

Related security & developer tools

Explore more free browser-based tools on ToolAdda: Password Generator for secure random passwords, JWT Debugger to decode and verify JSON web tokens, UUID Generator for unique identifiers, PEM to PPK Converter and PPK to PEM Converter for SSH keys, and Internet Speed Test to measure your connection.