How to check an image’s size and print dimensions
- Upload an image.
- Read the results. That's it really.
What the inspector tells you
Upload an image to get the numbers about it: width and height in pixels, aspect ratio, megapixels, file size and format. You'll also see roughly how much memory it takes up once it's opened.
The part people find most useful is print size. It tells you how big the image will print at 150 DPI (fine for posters seen from a distance) and at 300 DPI (sharp, photo-book quality), in both inches and centimeters.
To be clear, this reads the image's dimensions and file info. It does not read EXIF data like camera model or GPS location.
Frequently asked questions
Is my photo big enough to print?
Look at the 300 DPI size. If that's at least as big as the print you want, you're good. If only the 150 DPI size is big enough, it'll look okay from a few feet away but a bit soft up close.
Why is the memory usage so much bigger than the file size?
Files on disk are compressed. Once an image is opened, every pixel takes 4 bytes (red, green, blue and alpha), so a 12 megapixel photo needs around 48 MB, even if the JPG is only 3 MB.