6 Best Free Online Heartbleed Checker Websites

Here is a list of the best free online heartbleed checker websites. Heartbleed is a security vulnerability on the domains. It was first discovered back in 2014. The vulnerability was discovered in the widely used OpenSSL cryptographic software library. The heartbleed vulnerability allows attackers to access sensitive information from the affected system. It can be passwords, encryption keys, etc. This vulnerability allows attackers to potentially intercept sensitive data being transmitted over the internet.

To be sure that a domain you use or own doesn’t have heartbleed vulnerability, you can use heartbleed vulnerability checker tools. These tools streamline the process of checking heartbleed vulnerability on a domain. You can simply enter the domain you want to check and run the test. Within seconds you can discover if a domain is open to heartbleed vulnerability or not. This post covers 6 free websites where you can perform this check. With that said, let’s go through the post to check these tools in detail.

My Favorite Online Heartbleed Checker

Online-Domain-Tools.com is my favorite website on this list to perform heartbleed checks. It provides a simple tool where you can add the domain URL that you want to check and run the test. Along with that, it also has an input for a port number. This allows you to check a specific port for heartbleed vulnerability.

You can check out our other lists of the best free online Domain Health Checker websites, online TLS Checker websites, and online Spam Score Checker websites.

Overview Table:

Websites	Heartbleed Check	Additional Feature
Online-Domain-Tools.com	✓	Port
Site24x7.com	✓	Load Time
Norton.com	✓	x
SSL-Tools.net	✓	Mail Server Test
Possible.lv	✓	TLS Lookup
Siel.si	✓	x

Online-Domain-Tools.com

As the name suggests, Online-Domain-Tools.com offers a wide variety of domain, network, web, security, data, and other tools. It has a free heartbleed checker. The tool is simple to use. Along with the domain, you can also add a port number. With that, you can perform the check and get the heartbleed vulnerability of the domain. It shows if the domain is safe from vulnerability.

How to check heartbleed online on Online-Domain-Tools?

• Head over to this website using the link given below.
• Enter the website you want to test into the “Host/ IP address” box. Add the “Port” if you like or leave it as it is.
• Then click the Check button to get the output.

Highlights:

• This tool checks domains for heartbleed vulnerability.
• Option to run check on specific port number.
• It provides links to share the tool and tool with the result.

Site24x7.com

Site24x7.com offers a free online heartbleed checker tool. This is a simple tool where you can enter the domain name to run the check. Within seconds, it shows you whether the domain is vulnerable to heartbleed or not. Along with that, it also generates a small table where you get the load time of the domain along with the tested date. Besides that, you get a button to run a new test. This way, you can perform heartbleed vulnerability tests on multiple domains.

How to check heartbleed online on Site24x7.com?

• Go to this website using the link given below.
• Enter the website you want to test into the “Website Name” box.
• Then click the Test Now button to get the output.

Highlights:

• This tool checks domains for heartbleed vulnerability.
• It also shows the load time of the domain.

Norton.com

Norton is an antivirus that provides multiple security tools and measures to browse the web safely. Among that, the website also features a heartbleed test tool. This is a simple tool where you can add the domain to run the check. Initially, the interface is red. After the the check, it changes to green color for secure domains. Otherwise, it stays the same. Along with that, it also shows the results in return whether the domain is secure to heartbleed vulnerability or not.

How to check heartbleed online on Norton?

• Follow the link given below to open this tool in your browser.
• Enter the website you want to test into the given box.
• Then click the Check button to get the output.

Highlights:

• This tool checks domains for heartbleed vulnerability.
• This does not provide any additional information besides the check.

SSL-Tools.net

SSL-Tools.net is another website to perform online heartbleed checks. This website offers a simple tool where you can not only check the domains but mail servers as well. You get a separate input section for the domain name and mail server. You can enter your input in the respective field and then run the check. It takes a couple of seconds to run the test and then shows a bunch of information covering the heartbleed status.

How to check heartbleed online on SSL-Tools.net?

• Head over to this website using the link given below.
• Add the website you want to test into the box. You can also add an email server to test.
• Then click the button alongside each input to run the test.

Highlights:

• This tool checks domains for heartbleed vulnerability.
• Option to check the mail server as well.

Possible.lv

Possible.lv is another website where you can run the heartbleed vulnerability check online. It has a tool where you can add your domain URL and run the test. The test checks the TLS extensions on the website. Within seconds, it lists the TLS extensions along with their status. Based on that, it tells you if the domain is vulnerable to heartbleed or not.

How to check heartbleed online on Possible.lv?

• Use the link given below to open this tool in your browser.
• Enter the website you want to test into the input field alongside “https://”.
• Then click the Check button to get the output.

Highlights:

• This tool checks domains for heartbleed vulnerability.
• It also looks for TLS extensions.

Siel.si

Siel.si is yet another website that offers online heartbleed checks. The tool here has an input section where you have to add the domain URL. If you want to check a specific port then you can add that port number along with the domain and run the check. The test result shows you if the domain is vulnerable or not.

How to check heartbleed online on Siel.si?

• Follow the direct link given below to open this tool.
• Add the domain you want to test. You can also include a port number.
• Then click the Test button to get the output.

Highlights:

• This tool checks domains for heartbleed vulnerability.
• You can also add a port number along with the domain.