Don’t use shadow or any other effects
Don’t use transparency - opacity should be 100%
Don’t stretch or compress the logo
Don’t rotate the logo
Don’t change the color of the logo
Don’t use low res files - use the SVG format if possible
Do not alter or replace the font in the Zabbix logo
Don’t use the ZABBIX letters without the rectangle
Don’t use any gradients or resize the rectangle
Don’t use only letters on a red background
Don’t place the logo on a similar red background
Avoid strongly colored backgrounds

Permitted use
Restricted use that requires trademark license
Rules of use

Zabbix Trademark FAQ

Can I put Zabbix banners on my website? Can I link to you?
Doesn't having trademark restrictions contravene the principles of free software?
Can I make merchandise products (T-shirt/desktop wallpaper/coffee cup) with the Zabbix logo?
Can I modify your logos and distribute the result?
Am I allowed to use Zabbix screenshots, etc.?