How to Compress Photo Sizeby Chris Hoke ; Updated September 22, 2017
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If you are sending a photo via email or uploading a photo to your website, you'll want to compress the image by resizing or resampling it so it can be downloaded faster. Resizing an image means changing the size of the image while resampling refers to changing the number of pixels in the image. While they are two different processes, they can both help achieve the same effect: lowering the disk space taken up by an image. To accomplish this, you'll need an image-editing program capable of either effect.
Open the photo in your image-editing program.
Click the "Image" or "Edit" menu at the top of the image editor program window and choose "Resize" or "Resample". A window should appear where you can change the settings for the effect you've chosen.
Set the dimensions of the image smaller than the current dimensions, which will create a lower resolution image. If you've chosen to resample the image, adjust the PPI (pixels per inch) to a lower number. You may also have the option to change exactly how the program resizes or resamples the image. Experiment with the settings to create a good balance between compression and image quality.
Click the "File" menu and choose "Save As." This will save a new version of the resized/resampled photo, preserving the original image in the original dimensions and format. Type in a new name and choose a save directory. Choose a file format and click the "Save" button