Google toolbar custom button code generator

Settings Remark
Upload icon Upload any of the following filetypes: .gif, .jpg, .png, .jpeg.
The maximum file size = 50 KB.

For the best results the uploaded image size must be 16x16 px.

For example:
Icon example

If this is not possible, the image size must be a multiple of 16.
For example 16x16, 32x32, 48x48, 64x64 etc.