Saturday, December 2, 2023

10 Best Free SSL Checker Tools 2023

SSL Checker helps you troubleshoot common SSL issues and SSL endpoint vulnerabilities. With the Free SSL Checker Tools, you need to submit the domain name or IP address along with the port number to analyze the configuration and security of the website.

These diagnostics tools help you in finding vulnerabilities in SSL Suites, Weak Ciphers, and protocols. SSL analyzer tools make sure that your SSL/TLS certificate is installed correctly and doesn’t give any errors to users.

Free SSL Checker
How SSL Works

The SSL markets continue to grow, according to the new report, 80% of the web page that loads in Chrome and 70% of the page that loads on Android devices are with HTTPS.

Table of Contents

Free SSL Checker Tools & Keywords
10 Best Free SSL Checker Tools
SSL Labs
SSL Security Test
SSL certificate Decoder
Certificate Analyzer
DigiCert SSL Checker
AppSec SSL Analyzer
OpenSSL & SSLyze


1. What is an SSL certificate?

SSL certificates protect online data. Its main purposes are encryption and authentication. SSL certificates encrypt data between a user’s web browser and a web server, protecting login passwords, payment information, and personal data from intruders.

SSL certificates also validate the identity of the website or server a user connects to, reassuring them that the site is trustworthy.

HTTPS URLs indicate this encryption and authentication, which protects online communications’ privacy, integrity, and security.

2. How to check if SSL is valid?

You can check if an SSL certificate is valid using the OpenSSL command-line tool in a terminal:

  • Open a terminal window.
  • Run the following command, replacing “” with the domain or hostname you want to check:

openssl s_client -connect

  • Look for the “Verify return code” in the output. If it returns “0,” the SSL certificate is valid. If it returns any other code, the certificate may be invalid or has issues.
  • Optionally, you can also inspect the certificate details by scrolling up through the output to verify the certificate’s expiration date and issuer information.
  • To exit the OpenSSL tool, press Ctrl+C in the terminal.

3. How do I check my TLS certificate?

Open a terminal window.

  • Run the following command, replacing “” with your domain or hostname:

openssl s_client -connect -tls1_2

  • Look for the “Verify return code” in the output. A return code of “0” indicates a valid TLS certificate. Any other code suggests issues with the certificate.
  • Optionally, you can also review certificate details such as expiration date and issuer information by scrolling through the output.
  • To exit the OpenSSL tool, press Ctrl+C in the terminal.

4. How do I check my TLS and SSL settings?

  • Online Tools: You can use online SSL/TLS checker tools like SSL Labs ( to scan your website and provide detailed information about your SSL/TLS configuration.
  • OpenSSL Command: In a terminal, you can use the following command to check the SSL/TLS settings for a specific domain:

openssl s_client -connect

  • Replace “” with your domain. This command will show you the SSL/TLS version, cipher suite, and other configuration details used by your server.
  • Review the output for information about your SSL/TLS settings and ensure they meet security best practices.
  • Consider using security headers and settings in your web server configuration files to enhance your SSL/TLS security.
  • Regularly update and monitor your SSL/TLS configuration to maintain security and compliance with industry standards.

Free SSL Checker Tools & Keywords

SSL Checker ToolsKey Features
SSL LabsIn-depth scan
Ciphers, Protocols
Certificate status
SSL certificate DecoderCSR Checker
SSL Checker
SSL Converter
COMODO SSL AnalyzerWebserver Software
Certificate status
Certificate security
Certificate AnalyzerPort Scanning
DigiCert SSL CheckerCertification status
AppSec SSL AnalyzerWeb-based analyzer
Certificate status
GocertsSSLCSR Decoder
Certificate Decoder
Certificate Merger
SSLShopperPort Checker
Web Scanner
Certificate decoder
OpenSSL & SSLyzeCommand Prompt
Fast & Detailed Information
Vulnerability details

10 Best Free SSL Checker Tools

Here is the list of the Ten Best SSL analyzers that save you hours of troubleshooting time and headaches.

  • SSL Labs
  • SSL Security Test
  • SSL certificate Decoder
  • COMODO SSL Analyzer
  • Certificate Analyzer
  • DigiCert SSL Checker
  • AppSec SSL Analyzer
  • GocertsSSL
  • SSLShopper
  • OpenSSL & SSLyze

1. SSL Labs

The SSL Labs is powered by Qualys, with the tool you can check your website for certificate and configuration and your browser for SSL installation.

You can start the analysis by just entering the domain name or the IP address of the target server, it runs an in-depth scan and provides you with a detailed analysis report.

The report details the certificate installed, serial numbers, Certificate Transparency, Revocation status, Signature algorithm, DNS CAA, certification path, ciphers, protocols, and Handshake Simulation.

2. SSL Security Test

The SSL security test focuses completely on security, it also checks for compliance with PCI DSS requirements, HIPAA guidance, and NIST guidelines.

It also checks for the possible subdomains of the domain, chain, and vulnerabilities like heartbleed and POODLE OVER TLS.

Also, it checks for standard Industry practices such as CAA, Support for TLSv1.3, Ciphers, HSTS, and other standard practices.

3. SSL certificate Decoder

The decoder link powered by Namecheap is the best source for all your SSL-related troubleshooting needs.

It contains an SSL Checker, SSL Converter, CSR Decoder, DCV checker, Certificate & key checker, and decoder. link is a single-stop solution for all of your digital certificate needs.

4. COMODO SSL Analyzer

Gives you a crystal clear report on Certificate Details, status, web server software used, Protocol Versions, Ciphers, and Protocol Features.

Its clean design and rapid response are the advantages of this SSL Checker, by default it checks with port 443, but you can change it.

5. Certificate Analyzer

The Certificate Analyzer is powered by Trustwave, all you need is just to enter the domain name and the port number and click on test my server.

It does a basic installation check and provides a report about the certificate installed on the server.

6. DigiCert SSL Checker

DigiCert SSL Checker OR Symantec SSL checker (Acquired) helps you locate the problems with the installed SSL certificates and also checks for certificate status, Expiration, ciphers, and common vulnerabilities.

It’s a simple tool, if you want to check the installation with port 443 then just need to enter the domain name alone, if it is for the port number, then you need to provide the port number like

7. AppSec SSL Analyzer

Like other SSL checkers, AppSec is not web-based, you can download and launch the application from your computer.

It checks for the domain and/or IP address, and tests vulnerabilities related to the encryption algorithms. The latest version is AppSec Labs SSL Analyzer version 2.0.

8. GeocertsSSL

GeocertsSSL SSL checker is yet another simple SSL installation checker that checks for the certificate chain, DNS, and Certificate Common Name.

It also includes tools such as a CSR decoder, Certificate decoder, and certificate key matcher. All you need is just to enter the domain name, and port number and click on search.

9. SSLShopper

With the SSLShopper SSL Checker tool, you can diagnose installation problems with the SSL installation and it helps you to make sure that the certificate is correctly installed, valid, and trusted.

It also tracks the server type and the IP address of the domain, along with the chain. To use the SSL Checker with the port you just need to enter the server’s hostname.

10. OpenSSL & SSLyze

You can also use the following OpenSSL command to run an installation check

$ openssl s_client -showcerts -connect

SSLyze is the Fast and Complete SSL Scanner to find Misconfiguration in the servers configured with SSL.

sslyze –regular

Final Words

With SSL Checker you can diagnose all the issues related to issues and ensure the certificate is installed correctly on the server.


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