Steps to resize your photo 300px ✕ 300px (height ✕ width) and keep the file size within 50KB
Click on the area marked with red color.
Then select your photo.
After that click on the button CONTINUE TO EDIT PICTURE
Scroll down to the Resize Your Picture area
Select "Custom Size" from options
After that set width to 300, height to 300 and JPG max Filesize to 50 as like as shown in the following figure. Then click on the button I’M DONE, RESIZE MY PICTURE!
Then click on the button "Save to Disk" and save your photo
You are done! Please follow the same step to resize your signature to a 50KB, 300px ✕ 80px (width ✕ height) image.