To inspect exact PDF page dimensions, verify ISO A4 vs US Letter paper standards, detect mixed page sizes, and analyze PDF MediaBox, CropBox, BleedBox, and TrimBox vector coordinates instantly in your browser on RiazHub.com without uploading files to any external server.
Browser-Based PDF Page Size Checker
Inspect exact page dimensions, paper standards (ISO A4, US Letter, ARCH), orientation splits, and PDF bounding boxes (Media, Crop, Bleed, Trim) instantly.
Standard Paper Sizes & PDF Preflight Guide
Global commercial printing relies on two primary standards: ISO 216 (International Metric) and North American Imperial sheet dimensions:
| Paper Standard | Width × Height (mm) | Width × Height (Inches) | PDF Vector Points (72 pt/in) |
|---|---|---|---|
| ISO A4 | 210 × 297 mm | 8.27 × 11.69 in | 595.28 × 841.89 pt |
| ISO A3 | 297 × 420 mm | 11.69 × 16.54 in | 841.89 × 1190.55 pt |
| US Letter | 215.9 × 279.4 mm | 8.50 × 11.00 in | 612.00 × 792.00 pt |
| US Legal | 215.9 × 355.6 mm | 8.50 × 14.00 in | 612.00 × 1008.00 pt |
| Tabloid / Ledger | 279.4 × 431.8 mm | 11.00 × 17.00 in | 792.00 × 1224.00 pt |
Every PDF document contains up to five technical coordinate viewports known as Bounding Boxes:
- MediaBox: The physical sheet size boundaries on which the page is rendered.
- CropBox: The region displayed when opened in PDF viewers (Adobe Reader).
- BleedBox: The region including extra print bleed margins (usually 3mm / 0.125 in).
- TrimBox: The intended final physical cut line after commercial printing and finishing.
- ArtBox: The boundary enclosing the meaningful content/artwork on the page.
PDF documents store geometry in native vector PostScript points, where $1 \text{ inch} = 72 \text{ pt}$. To calculate exact metric dimensions:
1 pt = (25.4 / 72) mm ≈ 0.352777778 mm
mm = pt × 0.352778 | Inches = pt / 72 | Pixels (300 DPI) = pt × (300 / 72)
Your privacy is paramount. This auditing tool executes entirely inside your web browser using HTML5 File API and JavaScript WebAssembly vector engines. Zero PDF files, blueprints, or documents are ever uploaded, saved, or processed on external web servers.