Four boxes, one answer
A PDF page carries several nested rectangles: the MediaBox (the physical page), the TrimBox (where the cut lands, the finished size), the BleedBox(how far artwork must extend past the cut), and the CropBox (a viewing window). “What size is this PDF?” usually means the TrimBox for print work and the MediaBox for everything else. This checker reports both, plus the bleed margin between them.
Common sizes in points
| Size | Points | mm |
|---|---|---|
| A4 | 595 × 842 | 210 × 297 |
| US Letter | 612 × 792 | 215.9 × 279.4 |
| A5 | 420 × 595 | 148 × 210 |
| Business card EU + 3 mm bleed | 258 × 173 | 91 × 61 |
What to do with a wrong-sized PDF
If the checker shows a screen-sized page where a print size should be, re-export from the source at the product’s trim size with bleed. Resizing a finished PDF scales the artwork and rarely ends well. The bleed calculator gives the exact target dimensions; for a deeper print-readiness check, run the file through the PDF preflight tool.
