Open the image in an editor or app
Select the resize or image size option
Choose whether to keep the aspect ratio
Enter the new width and height
Apply the changes
Save the resized image
Use a web tool if you do not have editing software
Upload the image to the tool
Set the new dimensions or percentage
Download the resized image
Use a command-line tool if needed
Specify the target size or dimensions
Run the resize command
Check the output image size