Here are the main guidelines for the logo image, which you can set in Theme Options » General tab.

Dimensions

No matter the dimensions of the image you upload, the theme will always limit the height or the width of the logo to make it fit into the header. That limit depends on which header layout you’re using.

Side Header:
Limits the height to 140px.

Fullwidth Header + Menu Type Icon:
Limits the height to 60px and the width to 280px.

Fullwidth Header + Menu Type Static + Header Layout 1:
Limits the height to 60px and the width to 280px.

Fullwidth Header + Menu Type Static + Header Layout 2:
Limits the height to 60px and the width to 280px.

Fullwidth Header + Menu Type Static + Header Layout 3:
Limits the height to 60px and the width to 280px.

Fullwidth Header + Menu Type Static + Header Layout 4:
Limits the width to 100% of the container.

To get the best results, upload an image that has the same (or a bit bigger) height and width as the limits on each layout, but never smaller than that.

If you also want to upload a version suitable for retina devices, then the size should be twice as big as the regular one.

File Format

We recommend using PNG with transparent background.