An image size is not a video size.

The image check reads the pixel size from a PNG, JPEG, GIF, or WebP header. It stops at 20 MB. The file stays in the browser.

A video file and an audio file are rejected. The video size check reads duration, pixel size, and display aspect. The audio check reads a codec, a sample rate, and a channel label. This note does not repeat those reads.

An edge over 100,000 pixels stays blank. A short header stays blank. The check does not invent a size. It does not upload the file, change the file, or use a cloud output. A reframe export is a separate job.

An image size does not guarantee reach, approval, or a lower ad cost.