GIMP. It is a free GNU-licensed Image Manipulation Program available for download. The GIMP is nearly as useful and powerful as Adobe Photoshop, but does not cost $600.
Download, install, run program. It will take some time to learn to use the GIMP, but resizing is easy. You only have to drag your file into the GIMP window to open it, then go to Image/Scale Image...
and change the width to 800 pixels or less. That size will be good for the majority of computer users. Save your file (with a new file name, in case you screwed something up) and you're done.
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