The logo must be uploaded as a .GIF file. There is not a specific Size requirement anymore, however you will receive the best results if you keep it around 500x300. You may wish to play with your specific logo and find the best sizing for your image. You can use a image editing program like Photoshop, G.I.M.P. or Skitch.
For information on uploading logos click here.
If you require further assistance, please reach out to the Support Team using any of our channels -
Email: [email protected]