: Open Paint, click "Resize," set your desired pixels, and Save As a JPEG .
: Create a new file, select your dimensions, set the background to white or a solid color, and export it as a JPG. JPG vs. PNG: Which Blank File is Best? Create a Custom JPG - Online JPG Tools download blank jpg file
: Set a custom page size via "Page setup," leave the slide blank, and go to File > Download > JPEG image . : Open Paint, click "Resize," set your desired