Free IT & network tools for sysadmins and developers

SSL & certificates

Let's Encrypt Wizard ★︎

Issue a free Let's Encrypt SSL certificate manually — HTTP or DNS validation.

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SSL & certificates

SSL Checker ★︎

Validity, chain, expiry and hostname match for any server.

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SSL & certificates

PEM to PFX ★︎

Bundle a certificate, key and chain into a password-protected .pfx.

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SSL & certificates

CSR Generator ★︎

Generate a private key and a CSR with SANs, RSA or ECDSA.

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SSL & certificates

CSR Decoder ★︎

Decode a CSR and verify its self-signature.

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SSL & certificates

CRT Decoder ★︎

Read subject, issuer, SANs, fingerprints and expiry from a certificate.

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SSL & certificates

Key & CRT Match ★︎

Check that a private key really belongs to a certificate.

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SSL & certificates

Certificate Transparency Search ★︎

Every certificate ever issued for a domain — and the subdomains they reveal.

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SSL & certificates

TLS Protocol Scan ★︎

Which TLS versions a server accepts, plus the cipher it negotiates.

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SSL & certificates

PFX to PEM ★︎

Split a .pfx / .p12 back into its certificate, key and chain.

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