What are Trim size, Bleed size, Crop size, and Media size?

Trim size is the intended finished size after cutting. Bleed size describes the extra artwork area outside that finished edge, while Media size describes the full PDF page. Crop size controls the area a PDF viewer displays, but it does not reliably declare the intended finished print size. PrintSimple prefers an explicit Trim size. If no Trim size is declared, a consistent Media size may be used only when it exactly matches an active standard paper size. A non-standard PDF without an explicit Trim size needs to be exported again so PrintSimple does not guess, crop, or resize the artwork.