Premium users can replace or hide the logo.

Add the following parameter to your map: logo=<url>. An example is:

Another way to add a custom logo is to use advanced map options and upload a logo in the “Custom Images” section (see image).  Once an image is uploaded, the logo text and logo url can be modified.
Replace the default logo with your logo

The default logo image size is 45×45 pixels and the replacement should ideally be the same.

The supported file formats are: jpg (or jpeg), gif, ico, and png.

The following are not supported: svg and bmp (bitmap).