What is the PDF Page Size Checker?
The PDF Page Size Checker is an advanced diagnostic tool that analyzes every single page within a PDF document to report its exact dimensions and orientation. Unlike standard PDF readers that often hide this information, our tool parses the internal document structure to present precise measurements in standard typographic points, as well as calculated inches.
It automatically detects common industry standards like A4, US Letter, and Legal sizes, and highlights whether a page is in Portrait or Landscape orientation. This is particularly useful for identifying PDFs with mixed dimensions.
Step-by-step How to Use
- Click the file input button to select a PDF from your computer.
- Click the "Check Page Sizes" button.
- The tool will instantly read the PDF and populate a data table below.
- Review the table to see the specific dimensions, detected paper standard, and orientation for each individual page in your document.
Key Features
- Granular Analysis: Inspects dimensions on a per-page basis, easily identifying documents that haphazardly mix A4 and Letter sizes.
- Standard Detection: Automatically flags common paper formats based on their inch dimensions (allowing for minor tolerances).
- Multi-Unit Display: Shows exact typographic points alongside user-friendly inch measurements.
- Local Execution: Uses client-side JavaScript to guarantee your files are never uploaded or viewed by external servers.
Real-World Industry Applications
Commercial printers absolutely require this tool. When a client submits a manuscript for printing, a single landscape page or a randomly sized insert can derail an entire automated printing run. Print prepress operators use page size checkers to ensure a document strictly adheres to the required trim size. Furthermore, graphic designers use it to verify that bleed and margin dimensions were correctly exported from layout software like Adobe InDesign.
Client-Side Privacy Guarantee
We ensure 100% privacy for your unreleased books, legal filings, and sensitive reports. By leveraging the `pdf-lib` framework locally within your browser, no file data is ever transmitted over the network. The dimension extraction process takes place entirely within the secure sandbox of your local machine.
Frequently Asked Questions
- What are typographic points?
- A point is the standard unit of measurement in typography and PDF documents. There are exactly 72 points in one inch.
- Why does my document say "Custom" instead of "A4"?
- If your page dimensions deviate even slightly beyond our standard tolerance (often caused by adding bleed or crop marks during export), the tool will label it as Custom to alert you to the non-standard size.
- Can it detect page sizes in millimeters?
- Currently, we display points and inches, but you can easily convert inches to millimeters by multiplying by 25.4.
- Does this tool work offline?
- Yes, once the web page is loaded, the tool can function entirely without an internet connection.