100% free — no signup to use
Free email tools
A small set of genuinely free tools for email senders. No signup, no card — use them, then verify your whole list with KillBounce when you're ready.
Most popular
Email Verifier
Verify a single email address with a real SMTP probe. Catch-all, disposable, and role detection included.
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Zero signup
Bounce Rate Calculator
Enter your sends and bounces to instantly see your rate, a health assessment, and what to do about it.
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Zero signup
SPF / DKIM / DMARC Checker
Check your domain's email authentication in seconds and get a 0–100 deliverability score.
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Zero signup
Email Format Finder
Enter a name and company domain to get the most likely email patterns, ranked by how common they are.
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