Which software program is not able to alter the size of the original photo?

Microsoft Word does not primarily function as photo editing software, but rather as a word processing program. In this context, when images are inserted into Word documents, the program allows for some basic resizing options for display purposes. However, these changes do not affect the original photo file; they only alter how the image appears in the document.

In contrast, Adobe Photoshop, Picasa Web Album, and GIMP are dedicated image editing programs that offer robust tools for resizing images, which does change the image file itself. By using one of these programs, you can modify the dimensions and resolution, saving those changes to the original photo. This capability distinguishes them from Microsoft Word, which keeps the original file intact and unaltered.