Modify the logo name double click on the logo name below the picture. you can choose fonts from Classic or Art tabs in left side. Default Logo name is capital and you can modify by click on “AA” button on the tab. Choose your font color and font size from top menu also.
Px less than 300 X 300 is free and you also have paid option with more advance features. Once you have design your logo click Download button to save the logo file (gif and png format). you can signup to this website for feature modification and download.
It is free and we need to giving them the credits by link their website.