Two clicks to a clear result.

Your domain is your business card on the web. Our checks look at what it shows the world and tell you with a traffic light what works and what could be better – right in your browser, nothing to install.

Our checks

zwowebcheck

Security check for your website

Enter your address and see shortly how your website does on reachability, certificate, encryption and DNS – with a traffic light and concrete recommendations.

  • Certificate
  • TLS
  • HSTS
  • Security headers
  • DNSSEC & CAA
Check a website

zwomailcheck

Email check for your domain

One test mail, two minutes, a clear result: we check your domain's email setup and show with a traffic light what works and what could be better.

  • SPF
  • DKIM
  • DMARC
  • Blacklists
  • Spam score
Check email

More is on the way.

We're working on more checks for your domain. Meanwhile, you'll find short links, QR codes and more in the zwobyte toolbox.

Visit zwotools.de