online certificate analyzer

Upload or paste SSL/TLS certificates to analyze expiration dates, issuer details, subject information, key algorithms, and security parameters.

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About This Tool

The Online Certificate Analyzer is a comprehensive tool for examining SSL/TLS certificates. Upload certificate files in PEM, CRT, CER, or DER formats, or paste PEM content directly. The tool extracts and displays all critical certificate information including validity periods, issuer and subject details, public key algorithms, signature algorithms, extensions, and security warnings. Perfect for system administrators, developers, and security professionals who need to validate certificate configurations and troubleshoot SSL/TLS issues.

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How to Use

Upload a certificate file (PEM, CRT, CER, DER) or paste PEM content in the text area.
Select the certificate type if known (optional, auto-detection available).
Choose analysis options: basic details, full parsing, or security validation.
Click 'Analyze Certificate' to process the certificate.
View detailed results including validity dates, issuer/subject information, key details, and security warnings.

Frequently Asked Questions

Find Quick Answers

What certificate formats are supported?

The tool supports PEM (.pem, .crt, .cer), DER (.der), and PKCS#7 formats. You can also paste PEM content directly into the text area.

What information does the analyzer extract?

The tool extracts certificate validity dates, issuer and subject details, public key algorithm and size, signature algorithm, extensions (SAN, key usage, etc.), and provides security warnings for expired or weak certificates.

Is my certificate data secure?

Certificate analysis is performed securely on our servers. We do not store certificate files or private keys. Only the certificate's public information is processed for analysis.

Can I analyze certificates from websites?

This tool requires you to upload certificate files or paste certificate content. For analyzing live website certificates, you would need to first export the certificate from your browser or server.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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