Firs step - chose or select a file which you want to resize. After that set the scale 0.1 - 0.9 and if you want to increase the size of image then select 1 - 2 or are what you want.
If you want to add border on image, select padding pixcels and color or border. and the click to submit button.
you can change any setting of any time before download, after set all parameter click the download button
this image resizer helps you to resize image online