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One-Time SecretHash GeneratorPassword StrengthSecurity.txtCT Log SearchAXFR Zone Test
HTTP Sec ScoreSoon
WebRTC Leak TestIP Reputation
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Security.txt Checker

Check if a domain publishes a security.txt file (RFC 9116) with responsible disclosure contact information.

Examples:

Enter a domain to fetch its security.txt file

Generate a security.txt

Fill in the fields to build the file for your own site. Nothing you type leaves your browser.

One per line: an email address, a phone number or a web page for reports.
Several values in one box: one per line. Preferred-Languages is one comma list, for example en, fr.

Related Tools

SSL/TLS Checker

Check a domain’s SSL certificate - expiry date, issuer, covered domains, and whether HTTPS is currently reachable.

DNS Health Checker

Audit the DNS setup of any domain and get a letter grade with specific fix hints for each failing check.

HTTP Inspector

Inspect response headers and grade the HTTP security configuration for any URL. One request - raw headers and an A‑F security score side by side.

About this tool

Security.txt (RFC 9116) is a proposed standard that lets organizations define how security researchers should report vulnerabilities. The file is placed at /.well-known/security.txt and contains fields like Contact: (required), Expires:, Encryption:, and Policy:. This checker fetches both the RFC 9116 canonical location and the legacy root path, validates the Expires field, and surfaces all defined fields.

Where your data goes

Sent to our server: Domain. We fetch files from that site. To answer a repeated check fast, we have to keep answers for 1 hour; then they are deleted. Also added to the page link, so you can share the result: Domain.