All Free · No Signup Required

Free Email Tools

Everything you need to verify email addresses, calculate bounce rates, and embed verification on your own website — all free.

Free Tool · No Signup

Single Email Verifier

Check any email address instantly. Our 5-stage pipeline verifies syntax, MX records, SMTP delivery, catch-all status, and disposable detection — no account needed.

  • Syntax & RFC compliance check
  • DNS MX record lookup
  • SMTP mailbox verification
  • Catch-all domain detection
  • Disposable email detection
Full verifier page →

Single Email Verifier

Bounce Rate Calculator

Enter values above to calculate
Free Calculator

Bounce Rate Calculator

Quickly calculate your email bounce rate and understand whether it's within acceptable industry thresholds.

Excellent < 0.5%
Acceptable 0.5% – 2%
At Risk 2% – 5%
Danger Zone > 5%
How to reduce your bounce rate →
Embed Widget · Free to Use

Embed Email Checker on Your Website

Add a BounceZero email checker to any web page with a single iframe. Free for all websites — no API key required. Perfect for landing pages, contact pages, and demo integrations.

embed-snippet.html

<iframe src="https://bouncezero.io/embed/email-checker/" width="100%" height="120" frameborder="0" style="border-radius:12px"></iframe>
Preview widget →

Widget Preview

↑ This is the embedded widget

More Verification Tools

Free Email Verifier

Verify any single address instantly. No signup.

Bulk Email Validation

Upload a CSV and clean your entire list.

SMTP Email Checker

Real mailbox verification at the server level.

Email Validation API

Integrate verification into your app or workflow.