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PEM Certificate Viewer

Inspect PEM block types, decoded byte size, SHA-256 fingerprints, and certificate boundaries directly in your browser.

Paste a certificate, certificate chain, public key, CSR, or other PEM block. Avoid private keys and sensitive production material.

PEM Inspection Report

PEM certificate inspection results will appear here.
This tool checks PEM structure and decoded bytes. It does not fully parse X.509 fields, verify a certificate chain, match a private key, confirm hostname coverage, or establish trust. Avoid private keys and sensitive production material.

Inspecting PEM Certificates Before Using Them in Security Workflows

PEM is a text wrapper around Base64-encoded binary data. It is used for certificates, certificate requests, public keys, private keys, and other security material. The BEGIN and END labels identify the intended block type.

This viewer validates the Base64 body, reports the decoded byte size, calculates a SHA-256 fingerprint, and shows a limited readable byte preview. It is a structure inspector rather than a complete X.509 certificate parser.

Reviewing Certificate Blocks in the Browser

  1. Paste PEM certificate content into the input box.
  2. Click Inspect Certificate.
  3. Review block types, decoded size, fingerprints, and readable byte previews.
  4. Use the report as an initial check before using a dedicated X.509 or chain validator.

Common PEM Certificate Viewer Use Cases

  • Checking whether a PEM block is a certificate, key, or chain.
  • Inspecting certificate-like content copied from configuration files.
  • Reviewing PEM boundaries such as BEGIN CERTIFICATE and END CERTIFICATE.
  • Checking certificate chains before server or proxy configuration.
  • Comparing SHA-256 fingerprints while moving certificate files between systems.

Example PEM Certificate Block

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Frequently Asked Questions

What does a PEM Certificate Viewer do?

It reads PEM boundaries, validates the Base64 body, identifies the block label, reports decoded size, and calculates a SHA-256 fingerprint for the decoded bytes.

Can this fully decode every X.509 certificate field?

No. This tool does not fully parse ASN.1 or display every subject, issuer, validity, extension, SAN, or signature field. Use a dedicated X.509 parser for those details.

Should I paste private keys into this tool?

Avoid pasting private keys unless you are certain it is safe. This tool runs in your browser, but private keys and production secrets should always be handled carefully.

Is my PEM certificate uploaded to a server?

No. The PEM inspection happens directly in your browser. Your certificate content is not uploaded to a server.