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You can use Microsoft Office Picture Manager to resize photos or image files.
Resizing an image means that the file size is reduced and this may make it easier to send / email / upload / download. The cost of making an image file smaller is loss of quality - the image will start to look blurry or pixelated.
MS Office Picture Manager resize instructions
You have now created a second image file which is of a different (smaller) size that its original.
See also
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