How to Reduce a Digital Image File Size. You can resize a digital image file to fit a frame, send as an email attachment or insert it in a web page. Photo editing software allows you to reduce the ...

Reduce a PDF’s File Size Using Preview Open Finder and find the PDF you want to resize. Double-click the file, and it should open in Preview.

After installing the app, select the photo you want to resize, then choose a percentage, resolution, or specific file size. Once you've resized the image, simply save the new version.

Learn how to change file size in Paint and Paint 3D on Windows 11/10. You can also change the file resolution in Paint app and Paind 3D.