Well, after reading this post, I tried something.... It is FREE!
This worked in my browser, Explorer that comes with MS Windows.
FIRST MAKE A COPY OF YOUR PIC, just in case! Work with the copy.
Open a new window in the browser.
From the file dropdown menu, select Open.
At the bottom of the box, change the file type to whatever you are using. (like JPEG)
Using Browse, select the pic you are resizing and click OK.
The pic is now in your browser.
Click on the Image drop down menu, and then on Resize, and then resize to suit.
Save the pic.
Resizing a second time compresses a JPEG file, makes it much smaller.
Hope this helps, it is what I am using.