Cookie Security Checker

Audit a site's cookies

URL

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SSL Certificate Checker

Inspect an SSL certificate

Hostname

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Security Headers Checker

Score a site's security headers

URL

Scan →

MX Record Checker

MX record lookup

Domain

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DMARC Checker

Check a domain's DMARC

Domain

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DKIM Checker

Check a DKIM selector

Domain

Selector Find the selector in an email header's DKIM-Signature: s=... field.

Check →

SPF Checker

Check a domain's SPF

Domain

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DNS Lookup

DNS records

Domain

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WHOIS Lookup

WHOIS / RDAP lookup

Domain

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JWT Decoder

Decode a JWT

Privacy: runs entirely in your browser. We do not verify the signature (that needs the secret key).

Token

Decode →