If you have previously scanned documents that you would like to reduce in size, open them with Preview and then save them as a JPEG file using the Quality setting to reduce the file size.

Do you need to reduce the size of a Word document? Here's how on Office from Microsoft 365, Office 2021, and older versions.

How to Reduce a Photo's Size in Picasa 3. You can resize photos in Picasa 3, though the Resize Photo feature is not apparent in the application tools.