Cert Decoder

What is Cert Decoder

Cert Decoder is a free online tool for decoding X.509 SSL/TLS certificates in PEM format. It allows users to extract key certificate details securely in their browser without sending data to a server.

How to use Cert Decoder

1. Paste a PEM-encoded certificate into the provided text area.
2. Click the 'Decode Certificate' button to initiate the decoding process.
3. View the decoded information displayed in the output table.
4. Verify the details of your SSL/TLS certificate, including expiration dates and domain associations.

Features of Cert Decoder

• Instant Decoding: Quickly decode X.509 certificates without server interaction.
• Detailed Information Extraction: Extract issuer, validity, SAN, serial number, and fingerprint.
• Local Processing: All processing occurs in the user's browser for enhanced security.
• User-Friendly Interface: Simple and intuitive design for easy navigation.
• Comprehensive Certificate Information: Understand the structure and components of X.509 certificates.

Use Cases of Cert Decoder

• SSL/TLS Certificate Verification: Ensure the authenticity and validity of SSL/TLS certificates.
• Web Security: Help web developers and administrators manage and verify certificates for secure communications.
• Educational Tool: Serve as a resource for learning about X.509 certificates and their components.
• Testing and Development: Assist developers in testing certificate-related functionalities in applications.

FAQ from Cert Decoder

• What is a PEM certificate? A PEM certificate is a base64-encoded block that starts with "-----BEGIN CERTIFICATE-----" and ends with "-----END CERTIFICATE-----".
• Is my data safe when using Cert Decoder? Yes, all processing happens locally in your browser, and no data is sent to a server.
• What details can I extract from a certificate? You can extract details like issuer, validity period, SAN, serial number, and fingerprint.
• Can I use Cert Decoder for any certificate? Yes, as long as the certificate is in PEM format, it can be decoded using Cert Decoder.
• Do I need to install anything to use Cert Decoder? No, Cert Decoder is a web-based tool that requires no installation.