Thought this might help some of you out. Most computers have MS Paint.
How to make a photo smaller with MS Paint:
Open the folder or file with the picture in it. Choose one photo and RIGHT-CLICK on it. This gives a drop-down menu. Choose "Open with..." (left-click) and you will get another drop-down menu. Choose "Paint" (left-click).
The photo appears in the Paint screen. Across top menu bar, click on "Image." Drop-down menu -> choose "Resize/Skew." This gives you a dropped box. In the top half of the box it says Resize. That is the only area you use. The default settings are Horizontal 100% and Vertical 100%. Change each to 25% and click "OK."
That's almost it. You need to save your hard work, either replacing the original file or making a new name so that you have both versions of the picture. Within Paint, left-click on "File." This gives a drop-down menu.
To do replacing, click on "Save." You will get a box informing you that a file with that name already exists; do you want to replace it? Choose "OK."
To have both versions, click on "Save as..." You will be given a box with a horizontal bar for the new name. Type it in and then Click "OK."
Good luck.