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Inspect PEM certificates, keys, and CSRs in your browser.
-----BEGIN …----- and -----END …----- markers.For full ASN.1 / X.509 field decoding, paste a real certificate. This tool gives you the structure and DER bytes — pair with the SSL Cert Checker for fielded data.
Decode and inspect PEM-encoded objects — X.509 certificates, public keys, private keys, certificate signing requests, and EC keys. Identifies the object type, decodes to base64 → DER → ASN.1, and shows a human-readable summary. Everything runs in your browser; keys never leave your device.
PEM Inspector & Decoder allows you to quickly decode and inspect PEM-encoded objects such as X.509 certificates, public and private keys, and CSRs directly in your browser. Because processing happens entirely client-side, your sensitive keys never leave your device, ensuring complete privacy. It provides a human-readable summary by translating base64, DER, and ASN.1 data without requiring any software installation or user registration.
Good to know: This tool is designed for inspecting individual PEM objects in a browser; workflows requiring bulk file processing or offline desktop execution may require a specialized local application.
Follow these steps to decode and inspect PEM-encoded certificates, keys, or CSRs directly in your web browser.
Locate your PEM-encoded data
Find the X.509 certificate, private key, or CSR file you wish to inspect on your local machine.
Paste the PEM content into the input
Copy the text including the header and footer lines and paste it into the provided decoder input field.
Review the identified object type
The tool automatically identifies if the data is a certificate, public key, private key, or CSR.
Analyze the decoded ASN.1 structure
Examine the human-readable summary and the base64 to DER conversion results displayed on your screen.
Verify security details and metadata
Check the specific attributes and fields parsed from the PEM object to ensure they meet your requirements.
Estimated time: PT1M
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