Security & DevSecOps
X.509 certificate decoder
Read a PEM certificate's subject, validity, key and extensions — and see whether its key survives a quantum-capable adversary.
A certificate is public by design — it is what a server hands to anyone who connects, so pasting one here is safe. Never paste a private key, which begins -----BEGIN PRIVATE KEY-----. This tool has no use for one.
Inspection files can contain the original data and identifiers. Review them before sharing; downloads are processed locally. This is a parser inspection, not certification.
Decoded entirely in your browser with a hand-written DER reader — no library, no upload, no logging. The certificate never leaves the page. This tool decodes and inspects; it does not validate a chain, check revocation, or verify the signature.
More in this category
These exist because the underlying problem is real. If the numbers you just put in look uncomfortable, that is usually worth a conversation.
Stay ahead of the integration layer.
Integronauts Signal — practical enterprise integration, API and agentic AI thinking. The tools stay free either way.
Integronauts Signal is launching soon.
Practical enterprise integration, APIs, agentic AI and emerging architecture. Sign-up opens when the list does — nothing to enter yet.