PEM Key Inspector
Paste a PEM-encoded public or private key to see its algorithm, size or curve, and JWK representation — a quick sanity check before wiring a key into config.
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How to use it
Paste any SPKI public key (BEGIN PUBLIC KEY) or PKCS8 private key (BEGIN PRIVATE KEY) and click Inspect. The tool tries RSA first, then EC (P-256/P-384/P-521), and reports whichever import succeeds.
Frequently Asked Questions
What about older key formats?
PKCS1 (BEGIN RSA PRIVATE KEY) and SEC1 (BEGIN EC PRIVATE KEY) formats aren't supported directly — Web Crypto only imports PKCS8. Convert with openssl pkcs8 -topk8 first.
Is my private key uploaded anywhere?
No — all parsing happens locally via the browser's Web Crypto API. Still, treat any tool (including this one) with caution for production private keys; prefer testing with non-production keys where possible.