In Field ID you can upload your company logo to appear in the top left side of your Field ID account. To upload your company logo go to Setup > Branding.
Logo's should be either JPG or GIF with a size 215 x 61 pixels.
PDF Report Logo
For any PDF file that is generated from Field ID (including Certificates and Reports) you can add your logo to the top of the report. This is a different logo than your company logo above and can be changed for each organizational unit (or branch) that you have set up in Field ID.
To change your PDF Report Logo go to Setup > Manage Organizations and select Edit beside the Organizational Unit you would like to upload a logo for. Scroll to the bottom of the screen and look for PDF Report Image. There are no size restrictions for this image.