Checker Ssl Certificate

Fast, accurate and free online checker ssl certificate tool running directly in your browser.

Secure (SSL)

Client-Side Processing

100% Free

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Instructions

1

Enter data
Enter content, paste text or load a file from disk.
2

Click the button
The tool will immediately process your data in the browser.
3

Get the result
Copy the finished text or save the file to your device.

                                                function runTool() {

                                                  return "Result ready in 0.1s";

                                                }

Settings

Domain

Port

Show chain Tool Option

Result

raw: SSL Certificate Report ======================== Host: example.com:443 Checked at: 2026-08-30 22:52:59 UTC Summary ------- Common Name (CN): — SANs: example.com, *.example.com Hostname match: YES Valid from: 2026-07-29 22:10:08 UTC Valid until: 2026-10-27 22:17:21 UTC Days remaining: 57 Issuer ------ countryName: US organizationName: SSL Corporation commonName: Cloudflare TLS Issuing ECC CA 3 Subject ------- commonName: example.com Technical --------- Serial (hex): 0624D0AB311558780B7D5213B9631831 Signature: ecdsa-with-SHA256 X.509 version: 2 PEM (leaf certificate) --------------------- -----BEGIN CERTIFICATE----- MIID5jCCA42gAwIBAgIQBiTQqzEVWHgLfVITuWMYMTAKBggqhkjOPQQDAjBRMQsw CQYDVQQGEwJVUzEYMBYGA1UECgwPU1NMIENvcnBvcmF0aW9uMSgwJgYDVQQDDB9D bG91ZGZsYXJlIFRMUyBJc3N1aW5nIEVDQyBDQSAzMB4XDTI2MDcyOTIyMTAwOFoX DTI2MTAyNzIyMTcyMVowFjEUMBIGA1UEAwwLZXhhbXBsZS5jb20wWTATBgcqhkjO PQIBBggqhkjOPQMBBwNCAAR2Tgmj3bLPRaVN0Vud8FEAUiMz3Z2Bd5lti39uhuvB ARyn+R6JJkBCv54dlTizzaUBzLnriaPVW9uysYIJXTVio4ICgDCCAnwwDAYDVR0T AQH/BAIwADAfBgNVHSMEGDAWgBSDA/3n9vVKTRVB9O0iFtMyCj7KZjBsBggrBgEF BQcBAQRgMF4wOQYIKwYBBQUHMAKGLWh0dHA6Ly9pLmNmLWkuc3NsLmNvbS9DbG91 ZGZsYXJlLVRMUy1JLUUzLmNlcjAhBggrBgEFBQcwAYYVaHR0cDovL28uY2YtaS5z c2wuY29tMCUGA1UdEQQeMByCC2V4YW1wbGUuY29tgg0qLmV4YW1wbGUuY29tMCMG A1UdIAQcMBowCAYGZ4EMAQIBMA4GDCsGAQQBgqkwAQMBATATBgNVHSUEDDAKBggr BgEFBQcDATBTBgNVHR8ETDBKMEigRqBEhkJodHRwOi8vYy5jZi1pLnNzbC5jb20v YWU4MDFlZDFjNTViYjU3OWQ3OTIwOGIwZDc3MmFjZmI4Y2MzYTIwOC5jcmwwDgYD VR0PAQH/BAQDAgeAMA8GCSsGAQQBgtpLLAQCBQAwggEEBgorBgEEAdZ5AgQCBIH1 BIHyAPAAdwCUTkOH+uzB74HzGSQmqBhlAcfTXzgCAT9yZ31VNy4Z2AAAAZ+v9sM2 AAAEAwBIMEYCIQD9WFotRGzWRjLUpKu5UgFVEIW2JB7MtvZe+tocSNgcyQIhAJCF dDoCWE99JjFKSmzjeRhbiH0M3Aw+h414y9bGxT+PAHUAyKPEf8ezrbk1awE/anoS beM6TkOlxkb5l605dZkdz5oAAAGfr/bDTAAABAMARjBEAiAKprPtjMQLlLrSks4e CDoJZ6WqekRLH6AWHSHco9LXtQIgMsRhNtbw0Gp9Q0ItZB5D/0qTzrPKMBDbJZor +NZkce4wCgYIKoZIzj0EAwIDRwAwRAIgELh9REqDsIBMBAkADWsc3iuhbkwHyfcv 6w+HsjhdPcwCIDzda23fZzKA2+qG5L/k1ti5g4rk3WiJU0UbvpUGLKKv -----END CERTIFICATE----- PEM (certificate chain) ----------------------- --- Chain cert #1 --- -----BEGIN CERTIFICATE----- MIID5jCCA42gAwIBAgIQBiTQqzEVWHgLfVITuWMYMTAKBggqhkjOPQQDAjBRMQsw CQYDVQQGEwJVUzEYMBYGA1UECgwPU1NMIENvcnBvcmF0aW9uMSgwJgYDVQQDDB9D bG91ZGZsYXJlIFRMUyBJc3N1aW5nIEVDQyBDQSAzMB4XDTI2MDcyOTIyMTAwOFoX DTI2MTAyNzIyMTcyMVowFjEUMBIGA1UEAwwLZXhhbXBsZS5jb20wWTATBgcqhkjO PQIBBggqhkjOPQMBBwNCAAR2Tgmj3bLPRaVN0Vud8FEAUiMz3Z2Bd5lti39uhuvB ARyn+R6JJkBCv54dlTizzaUBzLnriaPVW9uysYIJXTVio4ICgDCCAnwwDAYDVR0T AQH/BAIwADAfBgNVHSMEGDAWgBSDA/3n9vVKTRVB9O0iFtMyCj7KZjBsBggrBgEF BQcBAQRgMF4wOQYIKwYBBQUHMAKGLWh0dHA6Ly9pLmNmLWkuc3NsLmNvbS9DbG91 ZGZsYXJlLVRMUy1JLUUzLmNlcjAhBggrBgEFBQcwAYYVaHR0cDovL28uY2YtaS5z c2wuY29tMCUGA1UdEQQeMByCC2V4YW1wbGUuY29tgg0qLmV4YW1wbGUuY29tMCMG A1UdIAQcMBowCAYGZ4EMAQIBMA4GDCsGAQQBgqkwAQMBATATBgNVHSUEDDAKBggr BgEFBQcDATBTBgNVHR8ETDBKMEigRqBEhkJodHRwOi8vYy5jZi1pLnNzbC5jb20v YWU4MDFlZDFjNTViYjU3OWQ3OTIwOGIwZDc3MmFjZmI4Y2MzYTIwOC5jcmwwDgYD VR0PAQH/BAQDAgeAMA8GCSsGAQQBgtpLLAQCBQAwggEEBgorBgEEAdZ5AgQCBIH1 BIHyAPAAdwCUTkOH+uzB74HzGSQmqBhlAcfTXzgCAT9yZ31VNy4Z2AAAAZ+v9sM2 AAAEAwBIMEYCIQD9WFotRGzWRjLUpKu5UgFVEIW2JB7MtvZe+tocSNgcyQIhAJCF dDoCWE99JjFKSmzjeRhbiH0M3Aw+h414y9bGxT+PAHUAyKPEf8ezrbk1awE/anoS beM6TkOlxkb5l605dZkdz5oAAAGfr/bDTAAABAMARjBEAiAKprPtjMQLlLrSks4e CDoJZ6WqekRLH6AWHSHco9LXtQIgMsRhNtbw0Gp9Q0ItZB5D/0qTzrPKMBDbJZor +NZkce4wCgYIKoZIzj0EAwIDRwAwRAIgELh9REqDsIBMBAkADWsc3iuhbkwHyfcv 6w+HsjhdPcwCIDzda23fZzKA2+qG5L/k1ti5g4rk3WiJU0UbvpUGLKKv -----END CERTIFICATE----- --- Chain cert #2 --- -----BEGIN CERTIFICATE----- MIIC4jCCAmmgAwIBAgIQMe7oivuHzZ74M2YEdD+bJzAKBggqhkjOPQQDAzBPMQsw CQYDVQQGEwJVUzEYMBYGA1UECgwPU1NMIENvcnBvcmF0aW9uMSYwJAYDVQQDDB1T U0wuY29tIFRMUyBUcmFuc2l0IEVDQyBDQSBSMjAeFw0yNTA1MjkxOTQ5NDVaFw0z NTA1MjcxOTQ5NDRaMFExCzAJBgNVBAYTAlVTMRgwFgYDVQQKDA9TU0wgQ29ycG9y YXRpb24xKDAmBgNVBAMMH0Nsb3VkZmxhcmUgVExTIElzc3VpbmcgRUNDIENBIDMw WTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAAT9HRQUjiNCkybPcNCJ17Eecqw+XVlS gd8c9dYludZ3B4ULjRKxKz9AuR9yBuD/QFIKk0n4yXGwfu7go0VRGER0o4IBIzCC AR8wEgYDVR0TAQH/BAgwBgEB/wIBADAfBgNVHSMEGDAWgBQyosfYWIv/f8A88lVp M+zOzB+8lzBIBggrBgEFBQcBAQQ8MDowOAYIKwYBBQUHMAKGLGh0dHA6Ly9jZXJ0 LnNzbC5jb20vU1NMLmNvbS1UTFMtVC1FQ0MtUjIuY2VyMBEGA1UdIAQKMAgwBgYE VR0gADAdBgNVHSUEFjAUBggrBgEFBQcDAgYIKwYBBQUHAwEwPQYDVR0fBDYwNDAy oDCgLoYsaHR0cDovL2NybHMuc3NsLmNvbS9TU0wuY29tLVRMUy1ULUVDQy1SMi5j cmwwHQYDVR0OBBYEFIMD/ef29UpNFUH07SIW0zIKPspmMA4GA1UdDwEB/wQEAwIB hjAKBggqhkjOPQQDAwNnADBkAjBkW/dgTArl36px6LVMWzfHLv0pFD+P9BoOYzir Z2aS2IwsQPHb0rQdZMY5NghTTk4CMCiwDU71fhtYVRulUc575HJroLXgj+BkpkBu bdHnb2+aPpCH7LP6QNQ/Xm9NiqdxAw== -----END CERTIFICATE----- --- Chain cert #3 --- -----BEGIN CERTIFICATE----- MIIDNDCCArmgAwIBAgIQYE2K+NALqHSLlVhTFyxfLjAKBggqhkjOPQQDAzBOMQsw CQYDVQQGEwJVUzEYMBYGA1UECgwPU1NMIENvcnBvcmF0aW9uMSUwIwYDVQQDDBxT U0wuY29tIFRMUyBFQ0MgUm9vdCBDQSAyMDIyMB4XDTIyMTAyMTE3MDIyM1oXDTM3 MTAxNzE3MDIyMlowTzELMAkGA1UEBhMCVVMxGDAWBgNVBAoMD1NTTCBDb3Jwb3Jh dGlvbjEmMCQGA1UEAwwdU1NMLmNvbSBUTFMgVHJhbnNpdCBFQ0MgQ0EgUjIwdjAQ BgcqhkjOPQIBBgUrgQQAIgNiAARk532ZA1NckR7q+NgjraG/LOJjie8oaPbt1/Ds q2iudyvkdpcbUOvbWSgtb7g2uauNl8pMIp7uidkCP/16czqQjSvMLzo3g9oNtC1F G3NyCWVfeCE954tmP0f9CSnWFA+jggFZMIIBVTASBgNVHRMBAf8ECDAGAQH/AgEB MB8GA1UdIwQYMBaAFImPL6PoK6AUVHvzVrgmX2c4C5zQMEwGCCsGAQUFBwEBBEAw PjA8BggrBgEFBQcwAoYwaHR0cDovL2NlcnQuc3NsLmNvbS9TU0xjb20tVExTLVJv b3QtMjAyMi1FQ0MuY2VyMD8GA1UdIAQ4MDYwNAYEVR0gADAsMCoGCCsGAQUFBwIB Fh5odHRwczovL3d3dy5zc2wuY29tL3JlcG9zaXRvcnkwHQYDVR0lBBYwFAYIKwYB BQUHAwIGCCsGAQUFBwMBMEEGA1UdHwQ6MDgwNqA0oDKGMGh0dHA6Ly9jcmxzLnNz bC5jb20vU1NMY29tLVRMUy1Sb290LTIwMjItRUNDLmNybDAdBgNVHQ4EFgQUMqLH 2FiL/3/APPJVaTPszswfvJcwDgYDVR0PAQH/BAQDAgGGMAoGCCqGSM49BAMDA2kA MGYCMQC4SkI+e2cts1nTN9MCRil97z624WxLAp94hT7tNZGPZLe9YiLIyzgKqW/b E0b2h9ACMQCvV5XMRcunAylQaCQc4J/GwR1p7yrPC0DRWWeyLAkQWi5Ylta9DxlX 74QFFksFCP0= -----END CERTIFICATE----- --- Chain cert #4 --- -----BEGIN CERTIFICATE----- MIIEPjCCAyagAwIBAgIQFz3KYOqfjhAm2vzXKBDkjjANBgkqhkiG9w0BAQsFADB7 MQswCQYDVQQGEwJHQjEbMBkGA1UECAwSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYD VQQHDAdTYWxmb3JkMRowGAYDVQQKDBFDb21vZG8gQ0EgTGltaXRlZDEhMB8GA1UE AwwYQUFBIENlcnRpZmljYXRlIFNlcnZpY2VzMB4XDTI1MDgwMTAwMDAwMFoXDTI4 MTIzMTIzNTk1OVowTjELMAkGA1UEBhMCVVMxGDAWBgNVBAoMD1NTTCBDb3Jwb3Jh dGlvbjElMCMGA1UEAwwcU1NMLmNvbSBUTFMgRUNDIFJvb3QgQ0EgMjAyMjB2MBAG ByqGSM49AgEGBSuBBAAiA2IABEUpNXP6wrgjzhR9qLFNoFs27iosU8NgCTWyJGYm acCzldZdkkAZDsalE3D07xJRKF3nzL35PIXBz5SQySvOkkJYWWf9lCcQZIxPBLFN SeR7T5v15wj4A4j3p8OSSxlUgaOCAZcwggGTMB8GA1UdIwQYMBaAFKARCiM+lvEH 7OKvKe+CpX/QMKS0MB0GA1UdDgQWBBSJjy+j6CugFFR781a4Jl9nOAuc0DAOBgNV HQ8BAf8EBAMCAYYwEgYDVR0TAQH/BAgwBgEB/wIBAjAdBgNVHSUEFjAUBggrBgEF BQcDAQYIKwYBBQUHAwIwgZIGA1UdIASBijCBhzAHBgVngQwBATAIBgZngQwBAgEw CAYGZ4EMAQICMAgGBmeBDAECAzAOBgwrBgEEAYKpMAEDAQEwDgYMKwYBBAGCqTAB AwECMA4GDCsGAQQBgqkwAQMBAzAOBgwrBgEEAYKpMAEDAQQwDgYMKwYBBAGCqTAB AwEFMA4GDCsGAQQBgqkwAQMBBjBDBgNVHR8EPDA6MDigNqA0hjJodHRwOi8vY3Js LmNvbW9kb2NhLmNvbS9BQUFDZXJ0aWZpY2F0ZVNlcnZpY2VzLmNybDA0BggrBgEF BQcBAQQoMCYwJAYIKwYBBQUHMAGGGGh0dHA6Ly9vY3NwLmNvbW9kb2NhLmNvbTAN BgkqhkiG9w0BAQsFAAOCAQEAQ+Vw+0vuJDzwOCiGy95GwysrnGBYAFdba+jQTkXY vkJWGtID1xfyUhKf8tZupwURpkOoVB+9ZvsR15BZ8OSZrRw8Uh32Qz6bYale3PZ8 0izAhlAwSWR0PD7MQxMUxY9b2GsCvSb8z1XgJxfMoZSRRCTVgWDhua7WB2MBdtN+ A88zoXdY/PhVnox0NZbMxXdCSWc2yojUEO3AwcGEcTL9+I1w6A89onNQ0SKfGXs/ Xz6UajT8m0gH1BtdUUbur3aB3+n0zJ/U7u35DKiGv5mmNG81ldZrWjBTJ1T9fxVI WmmbTVzZvygNMtUumSs5DelljhlJAidAsTc+5iCBJmqRFg== -----END CERTIFICATE-----

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SSL Certificate Checker - Free HTTPS Configuration Tester

SSL Certificate Checker is a professional online tester designed for network administrators, website owners and cybersecurity professionals. It enables immediate verification of the correct implementation of the SSL/TLS encryption protocol on any Internet domain, diagnosing potential configuration errors that may threaten the security of user data or negatively affect the website's positioning in search engines.

Why is having a valid SSL certificate absolutely crucial?

The SSL (Secure Sockets Layer) certificate and its newer version TLS (Transport Layer Security) are the foundations of a secure Internet. They are responsible for encrypting the connection between the user's browser and the server on which the website is located. Thanks to this, confidential data such as passwords, payment card details or personal data sent in contact forms are protected against interception by third parties. The lack of an SSL certificate causes the website to open using the insecure HTTP protocol, which is immediately signaled by modern browsers with a security warning.

Apart from the purely technical and security aspects, the SSL certificate is crucial for SEO (Search Engine Optimization). Google officially treats the presence of HTTPS as a ranking factor. Pages secured with a certificate are positioned higher in search results. Additionally, the lack of a padlock next to the URL address drastically reduces the credibility of the website in the eyes of users, which directly translates into a drop in conversions and a high bounce rate, especially in the e-commerce industry.

What parameters does the SSL certificate tester analyze?

Our free SSL tester performs a comprehensive query to the target server and analyzes the certificate structure. The verified parameters include: certificate validity status (start and expiration date), issuer name (e.g. Let's Encrypt, Sectigo, DigiCert), compliance of the domain name with the certificate (Common Name and Subject Alternative Names) and correctness of the certification chain (Certificate Chain). Breaking this chain is a common installation error that causes some older devices or operating systems to report a security error, even though the certificate itself is valid.

Additionally, the tool checks supported protocol versions (e.g. outdated and unsafe versions of SSL v3, TLS 1.0, TLS 1.1 and recommended TLS 1.2 and TLS 1.3) and the strength of encryption algorithms. Thanks to this, you get a full report on your server's resistance to man-in-the-middle attacks and other network vulnerabilities.

How to fix the most common SSL certificate errors?

If our tester shows errors, the first step should be to identify their source. If your certificate expires, please contact your hosting provider or generate a new free certificate (e.g. Let's Encrypt) and configure it to automatically renew every 90 days. If the tool reports a mismatch error, make sure the certificate covers both the www and non-www versions of the domain. If you are having problems with "mixed content", you need to update all image, script and CSS links on your site to load over secure HTTPS.

Frequently asked questions

How to check if the SSL certificate is installed correctly?

Enter your full domain address in the form above and click the test button. The tool will establish a secure connection and display a detailed certificate report.

What is the difference between a free SSL certificate and a paid one?

There is no difference in terms of encryption. Paid certificates (e.g. OV or EV) offer additional verification of the company's identity, higher financial guarantees and longer validity without the need for frequent renewal.

What does the SSL certificate expiration warning mean?

This means that the certificate has expired. The connection is no longer considered secure, and users visiting the site will see a blocking warning message in their browser.

What is Certificate Chain?

This is a certificate hierarchy that connects your domain certificate to a trusted root certificate (Root CA) through intermediate certificates (Intermediate CA). Must be fully valid for browsers to trust the page.

Does an SSL certificate protect the website against hacker attacks?

SSL only protects data sent between the user and the server against eavesdropping. It does not protect the website itself against hacking, malware or DDoS attacks.