Private Key Parameter Parser

Inspect public parameters of an RSA, ECC or SM2 private key and export its public key locally, without revealing private mathematical components.

Privacy: all processing happens locally in your browser. Your input never leaves your device.

What is Private Key Parameter Parser?

A private-key file must not be treated as configuration text that can be copied around. This tool reads a PEM/DER private key locally and reports only safe public parameters, such as the algorithm, RSA bit length or elliptic curve. It can export the corresponding public key as PEM but never displays or exports private mathematical components. The result helps identify a file type and algorithm compatibility, but does not replace private-key custody, certificate matching or deployment validation. Parse private keys only on a trusted device and browser.

How to Use

  1. Paste a PEM private key or import DER on a trusted device
  2. Review public algorithm parameters and optionally download the extracted public key
  3. Clear the input or close the page, then keep the original private key in controlled key storage

FAQ

Will it show private mathematical components?
No. The page reports algorithm and public parameters only; it neither displays nor exports components that could reconstruct or copy the private key.
Does the result prove a private key matches a certificate?
Not by itself. Use a dedicated comparison against the public key in the certificate, CSR or deployment environment.
Is my private key uploaded or stored?
No. Input is handled only in the current browser and is not sent to this site, history or cloud sync.

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Last updated 2026-10-09