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 Tools
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

Core Features:

Free SSL Checker Tools
SSL Labs
  • SSL Security Summary
  • SSL Labs Grade Distribution
  • Strict Transport Security

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.

To whom it is advised?

Website and application administrators and developers are the primary target audience for SSL Labs’ recommendations.

Our goal in providing this assistance is to make sure that these persons can set up a secure site or application quickly and easily.

Particularly helpful for people who are already swamped with work or who don’t have much time to devote to these kinds of activities, the guidance focuses on simple, straightforward steps that everyone may follow right now.

2. SSL Security Test

Free SSL Checker Tools
SSL Security Test

Core Features:

  • SSL/TLS Configurations Compliant with PCI DSS Requirements
  • Security Hardening of SSL/TLS Email Servers
  • Global SSL/TLS Grade Distribution

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.

To whom it is advised?

Web and email servers, among others, can have their SSL/TLS implementations and their level of security checked with ImmuniWeb’s SSL Security Test.

Although ImmuniWeb’s SSL Security Test does not make its intended consumers’ demographics publicly available owing to data access constraints, we may still make educated guesses based on the product’s features and functions.

3. SSL certificate Decoder

SSL Checker
SSL certificate Decoder

Core Features:

  • Insecure content Checker
  • SSL and CSR/Private Key Match
  • Approver Email Checker

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.

To whom it is advised?

IT workers, system administrators, cybersecurity experts, and website developers are the ones who should really use the SSL Certificate Decoder.

These people use the tool to decode SSL/TLS certificates and look at their details to make sure they are valid and properly configured.

This tool is especially helpful for fixing SSL/TLS problems, making sure that certificates are real, and making sure that security standards are being followed.

The SSL Certificate Decoder is a useful tool for keeping the web safe and trustworthy because it gives you detailed information about a certificate, like who issued it, how long it is good for, and the encryption algorithms it uses.

4. COMODO SSL Analyzer

SSL Checker

Core Features:

  • Unlimited Reissuance
  • 99.9% browser recognition maximizes your potential customer base
  • Secures AND

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.

To whom it is advised?

The COMODO SSL Analyzer is best for website developers, web managers, and IT security experts. This tool checks how secure SSL/TLS services are on a web server and gives you a report on what it finds.

This is especially helpful for people who are in charge of managing and protecting web server configurations, making sure that SSL/TLS certificates are installed properly and that the server’s encryption settings are set up in the safest and fastest way possible.

The analyzer is an important tool for professionals who want to keep web security and data protection at a high level because it helps them find possible vulnerabilities, wrong configurations, and issues with following industry standards.

5. Certificate Analyzer

SSL Checker
Certificate Analyzer

Core Features:

  • Full Certificate Warranties
  • VikingCloud Provides World Class Expert Support
  • Free Trusted Commerce® Site Seal

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.

To whom it is advised?

IT workers, system administrators, network engineers, and cybersecurity experts are often told to use the Certificate Analyzer tool.

It is meant to help these people look at and confirm the SSL/TLS certificates that are used in their network systems.

The tool is needed to make sure that the certificates are installed properly, are still valid, and meet current security standards.

The Certificate Analyzer helps keep communication routes for websites, email servers, and other internet-facing services safe and reliable by giving useful details about certificate paths, expiration dates, issuing authorities, and possible security holes.

6. DigiCert SSL Checker

SSL Checker Tools
DigiCert SSL Checker

Core Features:

  • Blocklist Check
  • Certificate Transparency (CT)
  • Log Monitoring

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

To whom it is advised?

Web administrators, IT pros, network managers, and cybersecurity specialists are the primary target audience for the DigiCert SSL Checker.

If these people want to make sure that their web servers have SSL/TLS certificates installed and configured correctly, this program is for them.

In particular, it helps to identify typical issues with SSL certificates, verify that browsers trust certificates, and check that the web server is set up securely.

These experts can monitor SSL/TLS security, stay in compliance with industry standards, and make sure website visitors and online transactions are safe by utilizing the DigiCert SSL Checker.

7. AppSec SSL Analyzer

SSL Checker Tools
AppSec SSL Analyzer

Core Features:

  • reporting problematic encryption methods
  • tests vulnerabilities
  • security testers

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.

To whom it is advised?

Web administrators, IT security experts, network engineers, and developers who focus on application security are just some of the pros who should use the AppSec SSL Analyzer.

This tool is especially useful for people who are in charge of making sure that SSL/TLS implementations on web servers and apps are safe and secure.

By looking at SSL/TLS setups, the AppSec SSL Analyzer helps find security holes, incorrect settings, and problems with following best practices.

Professionals who want to protect web-based apps and services must use this important tool to make sure that encrypted links are strong, safe, and up-to-date with the latest security standards.

8. GeocertsSSL

Free SSL Checker Tools

Core Features:

  • Free certificate-lifetime reissues
  • Compatible with all popular browsers
  • Unlimited server licenses

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.

To whom it is advised?

Webmasters, IT managers, system engineers, and cybersecurity experts who are in charge of managing and protecting web server configurations and SSL/TLS certificates should use the Geocerts SSL Checker.

This tool is especially helpful for making sure that SSL/TLS certificates are installed correctly on computers and that they are set up correctly and working as they should.

It helps these experts figure out common problems with SSL setups, verify certificate paths, look for security holes, and make sure they’re up to date with security standards.

The Geocerts SSL Checker is an important tool for keeping conversations on websites and other online platforms safe and encrypted.

9. SSLShopper

Free SSL Checker Tools

Core Features:

  • tracks the server type and the IP address
  • better management tools
  • Secure Tool

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.

To whom it is advised?

Cybersecurity specialists, web administrators, and IT pros are the target audience for the SSLShopper toolkit. Its purpose is to facilitate troubleshooting and maintenance of SSL/TLS certificates in a variety of contexts.

Verifying SSL/TLS certificate installation, typical problem diagnosis, and certificate specifics (such as issuance, expiration, and presence of correct encryption techniques) are all made easier with these tools.

Those whose job it is to keep web servers secure and intact and to guarantee encrypted communications over the internet will find them to be an invaluable resource.

The tools offered by SSLShopper are indispensable for efficient SSL/TLS management, whether one is setting up new certificates, renewing old ones, or fixing security issues.

10. OpenSSL & SSLyze

Core Features:

  • Focus on speed and reliability
  • Easy to operationalize
  • Support for scanning non-HTTP servers

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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