SSL Certificate Parser — Read PEM & CRT Files Privately

Name: EasyExtract SSL Certificate Parser
Availability: InStock
Author: Shah Abrar Ahmad

Inspect an X.509 SSL/TLS certificate (.pem, .crt, .cer) directly inside your web browser. Devops engineers and sysadmins need to check certificate validity, expiration dates, and Subject Alternative Names (SANs), but pasting private certificates into cloud tools creates security risks. Drop a file or paste PEM text below to extract metadata, calculate remaining days until expiry, and verify domain coverage without sending data anywhere.

Drop a .pem, .crt or .cer file here
or paste your certificate text below · 100% private in-browser

What is an X.509 SSL/TLS Certificate?

An X.509 SSL/TLS Certificate (IETF RFC 5280) binds a public key to an organizational identity. PEM files use Base64 encoding wrapped in -----BEGIN CERTIFICATE----- boundaries.

EasyExtract parses certificate ASN.1 structures locally to inspect expiry and SANs without transmitting certificate data over the network.

How to inspect an SSL certificate file

Paste or drop certificate file. Paste your PEM text starting with -----BEGIN CERTIFICATE----- into the box above, or drop a .pem / .crt file.
Click Inspect Certificate. The browser decodes the Base64 ASN.1 DER structure and computes the SHA-256 fingerprint via Web Crypto API.
Review certificate metadata. Check Subject Common Name (CN), Issuer (CA), validity start/end dates, and remaining days until expiration.
Verify domain coverage. Review Subject Alternative Names (SANs) to confirm wildcard and sub-domain coverage.

What metadata is extracted from SSL certificates?

Subject Common Name (CN) & Subject Alternative Names (SANs).
Issuer Name (Certificate Authority).
Validity Dates (Not Before, Not After, and days remaining).
SHA-256 Fingerprint (Cryptographic thumbprint).

Supported certificate formats

Supports PEM, CRT, CER, and plain text X.509 certificate files.

Privacy and security

All certificate parsing and cryptographic fingerprinting happen 100% inside your web browser. Zero certificate data is sent to any server.

Known limitations

Does not perform online Certificate Revocation List (CRL) or OCSP revocation status checks.

Common use cases

DevOps Monitoring — Checking SSL certificate expiration dates before renewals.
Domain Audits — Verifying multi-domain SAN coverage for subdomains.
Security Verification — Computing certificate SHA-256 fingerprints.

SSL Certificate Parser vs Office Metadata Extractor

While the office metadata extractor parses document properties, this tool parses cryptographic X.509 certificates. For PDF metadata, use our PDF metadata extractor.

Frequently asked questions

How do I check when an SSL certificate expires?

Paste your PEM certificate text or drop the .crt file above to view the exact expiration date and remaining days.

Is it safe to paste an SSL certificate online?

Yes, with EasyExtract it is 100% safe because parsing runs locally in your browser memory — nothing is uploaded.

What is a SAN in an SSL certificate?

Subject Alternative Names (SANs) specify additional domain names and subdomains secured by the certificate.

What is a PEM certificate?

PEM is a text container format for X.509 certificates starting with -----BEGIN CERTIFICATE-----.

Reviewed by Shah Abrar Ahmad & the EasyExtract Engineering Team • Specialist file parsing & security engineer • Verified: in our experience, our hands-on testing measured and verified private in-browser execution with zero file uploads • Last reviewed September 2026.