PEM (Privacy-Enhanced Mail) is the most common certificate storage format, Base64-encoded text between -----BEGIN and -----END markers, containing certificates, private keys, or CSRs.

Is file drag-and-drop supported?

Yes. Drag .pem/.crt/.key files directly to the input area for parsing.

Free Online PEM Certificate Parser

Q: What PEM types are supported?

Supports parsing X.509 certificates (CERTIFICATE), private keys (PRIVATE KEY), and certificate signing requests (CSR).

Q: Is data uploaded to a server?

No. All PEM parsing happens locally in the browser. Private keys and sensitive data never leave your device.

Q: Can I view SAN extensions?

Yes. After parsing, all domains and IPs in the Subject Alternative Name (SAN) extension are displayed.

Q: How to check if a certificate is expired?

After parsing, the validity period is shown with automatic expiration check and color-coded status.

Pure Frontend · X.509 Certificate Parsing · Validity Check · SAN Extensions

Zero Dependencies · Works Offline

🔐 Enter PEM Content

📁 Drag .pem / .crt / .key files here

What Can the PEM Certificate Parser Do?

The PEM Certificate Parser is a pure frontend online tool for parsing PEM-formatted X.509 certificates, private keys, and CSRs. Enter PEM content to view subject, issuer, validity period, serial number, SAN extensions, and more. Automatically checks certificate expiration. All parsing happens locally in the browser.

Core Features

Certificate Parsing: Parse X.509 certificates showing subject, issuer, validity, serial number
Validity Check: Automatic expiration detection with color-coded status
SAN Extensions: Display all domains and IPs in Subject Alternative Name
Private Key Detection: Identify RSA/EC private key type and key length
File Drag & Drop: Drag .pem/.crt/.key files directly

How to Use

Step 1: Paste PEM content or drag a certificate file.

Step 2: Click "Parse".

Step 3: View parsed results including certificate details and validity status.

Step 4: Copy any information you need.

Use Cases

SSL Certificate Check

Ops teams quickly check SSL certificate validity, domain coverage, and issuer information.

Certificate Debugging

Developers verify certificate chains and SAN extensions when configuring HTTPS.

Security Audit

Security teams review key length, signature algorithm, and validity against security policies.

Certificate Renewal

Check current certificate details for accurate renewal before expiration.

Extended Knowledge

PEM (Privacy-Enhanced Mail) is the most common certificate storage format using Base64-encoded DER data between -----BEGIN ...----- and -----END ...----- markers. X.509 is the international standard for public key certificates, defining structure and content including version, serial number, signature algorithm, issuer, validity, subject, public key info, and extensions. SAN (Subject Alternative Name) allows one certificate to protect multiple domains and is standard for modern HTTPS certificates.

FAQ

What is PEM format?

PEM is the most common certificate format, Base64-encoded text between -----BEGIN and -----END markers, containing certificates, private keys, or CSRs.

What PEM types are supported?

Supports X.509 certificates (CERTIFICATE), private keys (PRIVATE KEY), and certificate signing requests (CSR).

Is data uploaded to a server?

No. All parsing happens locally. Private keys and sensitive data never leave your device.

Can I view SAN extensions?

Yes. All domains and IPs in the SAN extension are displayed after parsing.

How to check certificate expiration?

After parsing, validity period is shown with automatic expiration check and color-coded status.

Is drag-and-drop supported?

Yes. Drag .pem/.crt/.key files directly to the input area.

PEM Certificate Parser