This functionality requires TestRail 6.6 or later.
TestRail supports uploading a company logo which will automatically be included in emails and reports. As an administrator, navigate to Administration > Site Settings, and select User Interface. At the bottom of this page you have the option to upload or update your organization logo.
The logo must be a JPG,PNG or GIF format, have horizontal proportions, and be a maximum 250 KB in size. We strongly recommend using a logo with a white or transparent background.
Once uploaded, this logo will automatically be added to TestRail’s reports and emails.