SSL Certificate Decoder is a free tool to check and decode SSL certificates of online websites. View full publisher information (Issuer), validity period, TLS protocol, key size, serial number and fingerprint. The tool helps you monitor SSL status, receive warnings when certificates are about to expire to avoid service interruptions. SSL (Secure Sockets Layer) is an important security standard that helps encrypt data transmitted between browser and server, protecting sensitive user information such as passwords, credit cards and personal data.
Outstanding features
Quickly check SSL certificate with only domain name
Displays remaining term with intuitive color warning
View detailed publisher information
Check protocol TLS version (1.2, 1.3)
Display key size (2048 bit, 4096 bit)
See serial number and fingerprint SHA256
Warning when SSL is about to expire (less than 30 days)
Detect expired or invalid SSL
Supports checking all public domains
User-friendly interface with easy-to-read results
warnings Why Need to Check SSL Certificate Periodically?
SSL certificate is the most important security element of a website. When SSL expires, the browser will display a warning
Benefits when used
•Make sure your website is always secure with valid SSL
•Avoid losing customers due to
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Instructions for Using SSL Certificate Decoder
1Enter the domain you want to check in the input box (for example: example.com)
2You can enter the full URL, the tool will automatically extract the domain
3Press the
4button or Enter to start
5Wait a few seconds for the tool to connect and get SSL information
6View results with color status: green (valid), yellow (about to expire), red (expired)
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