How to Decode SSL Certificate Online Free
Our free SSL Certificate Decoder allows you to decode and analyze PEM/X.509 certificates instantly in your browser. Simply paste your certificate or upload a file to view complete certificate details including subject, issuer, validity dates, fingerprints, and extensions. No registration required.
Free SSL Certificate Parser for Developers
This SSL Certificate Decoder is specifically designed for developers and system administrators who need to quickly analyze SSL/TLS certificates. Parse certificate chains, extract technical details, verify fingerprints, and check expiry dates without compromising security.
Check SSL Certificate Expiry Date Online
Easily check SSL certificate expiry dates and validity periods. Our tool automatically calculates days until expiry and displays clear status indicators (Valid, Expiring Soon, Expired). Upload .pem, .crt, or .cer files directly for instant analysis.
X.509 Certificate Viewer and Analyzer
View and analyze X.509 certificate details including subject alternative names (SAN), key usage, signature algorithms, and public key information. Supports certificate chains and provides SHA-1 and SHA-256 fingerprints for verification.
Frequently Asked Questions
What is an SSL certificate?
An SSL certificate is a digital certificate that authenticates a website's identity and enables encrypted connections. It contains information about the website owner, the certificate authority, and public key for encryption.
How to decode SSL certificate online?
Simply paste your PEM-formatted certificate into the input field or upload your certificate file (.pem, .crt, .cer), then click 'Parse Certificate'. The tool will instantly display all certificate details including validity, fingerprints, and extensions.
Is this SSL decoder tool free?
Yes, our SSL Certificate Decoder is completely free to use. No registration required, no limits, and no hidden costs. Perfect for developers, system administrators, and security professionals.
What certificate formats are supported?
The tool supports PEM-formatted X.509 certificates. You can upload .pem, .crt, .cer, and .cert files. Both single certificates and certificate chains are supported.
Is my certificate data secure?
Absolutely! All certificate parsing happens entirely in your browser. Your certificate data never leaves your device, ensuring complete privacy and security. No server uploads or external transmission.
What information can I extract from certificates?
The tool extracts subject and issuer details, validity dates, serial number, signature algorithm, public key information, SHA-1 and SHA-256 fingerprints, Subject Alternative Names (SAN), key usage, and other X.509 extensions.
Can I check certificate expiry date?
Yes! The tool automatically calculates and displays the certificate's validity status, including whether it's valid, expired, expiring soon, or not yet valid. It also shows the exact number of days until expiry.
How to verify SSL certificate fingerprint?
The tool automatically calculates both SHA-1 and SHA-256 fingerprints for the certificate. You can use these fingerprints to verify the certificate's authenticity by comparing them with trusted sources.