About zerobounce.ai
Free tools for email deliverability and web security. No signup, no cookies, no trackers.
Who makes this
zerobounce.ai is made by Hertza L.L.C., the company behind ZeroBounce, the email validation service trusted by more than 650,000 customers to keep their lists clean and their mail in the inbox. The tools are free; links to ZeroBounce go to our own paid service.
They were built by Liviu Tanase, ZeroBounce’s founder and CEO, as the utilities he wished existed: fast, honest about their limits, and free. Each one does a single job well, from grading a TLS setup to auditing an SPF record or tracing a suspicious redirect, and says plainly what it can and can’t prove.
The rules every tool follows
Built to avoid false alarms
A deliverability tool that cries wolf is worse than no tool. Every check is conservative about what it claims, and every grade shows the evidence behind it.
“Couldn’t check” is never “clean”
When a lookup times out or a server refuses to answer, the result says so. A failed check is shown as failed, not as a pass.
Your data isn’t for sale
Tools run in your browser or on our servers on Cloudflare, and some answers come from third-party services named in the privacy policy. Nothing you check is sold or used for advertising. Recent inputs are remembered only in your own browser, and you can clear them. Read the privacy policy.
Safe by construction
Every page runs under a Content Security Policy, so results from the internet are always shown as text, never as code. Server-side checks refuse private and reserved addresses on every hop.
No support
zerobounce.ai is provided as is, with no support and no warranty of any kind; see the terms of use.