Free security tools
All of Cactus's security tools
Every Cactus checker in one place, grouped by what you're trying to do. All free, no signup, and bilingual - pick a tool to get a clear, plain-language result.
Links & messages
Link check
Paste a URL to scan it for phishing, lookalike domains, and risky redirects.
QR code check
Decode a QR image and inspect the link inside before you visit it.
Email check
Check a suspicious email for phishing links, urgency tactics, and spoofed senders.
Scam Text Checker
Paste a suspicious text or message to spot scam signs.
Batch check
Scan up to 20 links at once and get a risk score for each.
Site & domain security
SSL/TLS check
Inspect a site's certificate, protocol, and overall security grade.
Email auth
See whether a domain is protected against spoofing with SPF, DKIM, and DMARC.
Security headers
Grade any website's HTTP security headers - HSTS, CSP, and more - and see what's missing.
Look-alike domains
Find the typo and look-alike domains that could impersonate a brand - and which are live.
Certificate search
Discover a domain's subdomains and every TLS certificate ever issued, from public CT logs.
IP Reputation
Look up who owns an IP and whether it's on spam/abuse blocklists.