Local check
Read an image size.
The check reads the pixel size from a PNG, JPEG, GIF, or WebP header. It stops at 20 MB. An edge over 100,000 pixels stays blank.
What this read leaves out
A video file stays on the size check. This page does not read a duration, a pixel size from a video stream, or a display aspect.
The eight container tags stay on the tag check. A SHA-256 stays on the hash check. A missing image size stays blank.
An image size does not guarantee reach, approval, or a lower ad cost.