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PEM Certificate Inspector

Read real PEM or DER certificate metadata, validity dates and SHA-256 fingerprints locally.

pem-certificate-inspectorLOCAL WORKSPACE

Enabling local controls…

Local memory only: no upload, storage, host connection or credential operation. The report describes limited structural checks and risk hints.

Paste 32 KiB or choose a 1 MiB PEM/DER file, at most 20 certificates. Reads start only after Inspect. This is a self-signed public demo certificate. Dates and parsing do not verify signatures, chain trust, hostnames, revocation or private-key ownership.

Source reviewed 2026-10-19: ToolHub source · RFC 5280 PKIX certificates

Edit input and inspect. Changes clear old results and cancel pending work.

How to use this tool

Edit the bounded input, inspect locally, then explicitly copy or download the complete report. Changes cancel and clear old results.

When not to use it

Paste 32 KiB or choose a 1 MiB PEM/DER file, at most 20 certificates. Reads start only after Inspect. This is a self-signed public demo certificate. Dates and parsing do not verify signatures, chain trust, hostnames, revocation or private-key ownership.