To create Google+ profile banners
1.Go to gplusbanner.com .
2.Click the upload photo and upload your image. Note that image must be less than 10 MB in file size and only jpg/gif/png. For best results, use an image with 685px width and 125px height.
3.After the successful upload crop the area to use as the banner. And then click render images button.
4.Right-click and select Save image as and save all five images
5.Login your google+ and click the Edit Profile button on Google+.