Decode SSL Certificate
Validate and analyze SSL/TLS certificate details
Paste your complete SSL certificate including the BEGIN and END lines
SSL Certificate Decoder & Validator Tool
Decode and validate SSL/TLS certificates instantly. Our free online SSL certificate decoder tool checks certificate validity, expiration dates, issuer information, and all certificate details for secure web communications.
About SSL Certificate Decoding
SSL/TLS certificates are digital certificates that secure web communications. Our SSL certificate decoder tool helps you analyze and validate certificates by decoding all the information contained within them.
What Our SSL Certificate Decoder Shows:
- Certificate validity status (Valid, Expired, or Not Yet Valid)
- Domain name and Subject Alternative Names (SANs)
- Organization and issuer information
- Certificate expiration date and days until expiry
- Valid from and valid until dates
- Serial number and signature algorithm
- Public key size and type
Why Use SSL Certificate Decoder?
- Check SSL certificate expiration dates to prevent outages
- Verify certificate was issued for correct domain names
- Confirm SSL certificate issuer is legitimate
- Validate SSL certificate before installation on server
- Troubleshoot SSL certificate issues and errors
- Ensure SSL certificate meets security requirements
How to Use SSL Certificate Decoder:
- Copy your SSL certificate in PEM format (plain text)
- Include the BEGIN CERTIFICATE and END CERTIFICATE lines
- Paste the certificate into the text area above
- Click "Decode & Validate SSL Certificate" button
- Review all certificate details and validity status
Understanding SSL Certificate Status:
Valid
Certificate is currently valid and can be used for SSL/TLS encryption
Expired
Certificate has passed its expiration date and should be renewed
Not Yet Valid
Certificate validity period has not started yet