PDF Page Size Detector - Check PDF Page Dimensions Online
Detect the dimensions of every page in a PDF in points, inches, and millimetres, and match each page to its closest standard size (A4, Letter, Legal, etc.). Free, private, runs entirely in your browser.
Click to select a PDF file, or drag and drop
Your file never leaves your browserHow to Check PDF Page Dimensions
- Upload the PDF you want to inspect.
- Click Detect Page Sizes to see each page's width and height in points, inches, and millimetres, along with the closest standard size name (A4, Letter, etc.).
Example
A standard A4 document will show 595.28 x 841.89 points, which equals 8.27 x 11.69 inches or 210.0 x 297.0 mm — matched to the A4 standard. A US Letter page will show 612 x 792 points (8.50 x 11.00 inches) — matched to Letter.
Common Use Cases
- Confirming whether a PDF is A4 or Letter before sending it to a printer in a different region.
- Checking whether a batch of PDFs has mixed page sizes that could cause formatting issues.
- Verifying page dimensions before importing a PDF into design or publishing software.
FAQ
- What are PDF points? One PDF point equals 1/72 of an inch. Most standard page sizes are defined in points in the PDF specification.
- Why does a page show as "Custom"? If the page dimensions don't match any of the built-in standards (A4, A3, A5, Letter, Legal, Tabloid) within 2 points, it is labelled "Custom".
- Is my file uploaded anywhere? No — size detection happens entirely in your browser; the PDF is never sent to a server.