Subtract your target size from your original size, divide by the original size, and multiply by 100. Our calculator does this math instantly for you.

Generally, you can compress an image by 20% to 50% without noticeable quality loss. Anything over 80% compression will likely make the photo heavily pixelated.

1 Megabyte (MB) is equal to 1,024 Kilobytes (KB). Most online portals ask for file sizes in KB.

No, compressing changes the file size (data) by reducing quality or color depth, not the physical width and height (pixels). Resizing changes dimensions.