The most ideal measurements for your logo are 754 pixels in width and 217 pixels in height.
Of course, deviations are allowed, although the square shape is recommended. Moreover, it’s not necessary to upload your logo in print-format, a conventional image file is satisfactory.
Please try to refresh the page. If you are still experiencing problems, you may want to test another browser such as Google Chrome, Mozilla Firefox or Apple Safari.
Make sure the correct paper format is selected, i.e. A4.
If you are using Google Chrome: You can save the file with a pdf-extension. In this way, you can choose to print the badges when it suits you.