Page Dimensions

What is Page Dimensions?

Page Dimensions reports the width and height of every page in a PDF, measured in points (1 point = 1/72 inch). The tool uses pdf-lib to read each page's MediaBox and report its dimensions.

The output is a JSON file containing an array of page dimension objects, each with page number, width, height, and the standard size name (A4, Letter, Legal, etc.) if it matches a known format.

This is useful for verifying that all pages have consistent dimensions, identifying mixed-size documents, and determining the correct output settings for printing or further processing.

PDF dimensions are measured in points where 1 point equals 1/72 inch. Common sizes include A4 at 595.28 x 841.89 points (210 x 297mm), US Letter at 612 x 792 points (8.5 x 11 inches), and US Legal at 612 x 1008 points (8.5 x 14 inches). The tool reads the MediaBox array from each page dictionary, which defines the physical page boundaries.

How to Use Page Dimensions

1. Drop a PDF onto the upload zone, or click to browse and select it.
2. Click Check Dimensions. The tool reads the MediaBox of every page.
3. A download button appears with page-dimensions.json listing each page's width, height, and detected size.

Why Use Page Dimensions?

Print shops need exact page dimensions to configure their RIP (Raster Image Processor) settings. Incorrect dimensions cause scaling errors, cropped content, or wasted paper.

Document preparers merging PDFs from different sources need to verify that page sizes are consistent. Mixed dimensions in a merged document can cause layout issues in viewers and printers.

PDF/A compliance requires specific page dimension ranges. Checking dimensions before submission ensures the document meets archival format requirements.

Print production teams need exact dimensions to configure imposition software, cutting templates, and binding equipment. Even small dimension mismatches can cause content to be trimmed or misaligned in the final printed product.

Privacy & Security

Your files never leave your browser. Every step — reading page MediaBox values and generating the JSON output — happens on your own device using pdf-lib. Nothing is uploaded to Racira's servers, no copies are stored in the cloud, and no file data is transmitted at any point.

Frequently Asked Questions

What standard sizes are detected?

A4 (595.28 x 841.89 pt), US Letter (612 x 792 pt), US Legal (612 x 1008 pt), A3 (841.89 x 1190.55 pt), and A5 (419.53 x 595.28 pt). Pages that don't match standard sizes are reported as Custom.

Does it report CropBox or just MediaBox?

The tool reports MediaBox dimensions, which represent the physical page size. CropBox, TrimBox, and BleedBox (which define visible and print areas) are not separately reported.

What if pages have different sizes?

Each page is reported individually. If a document has mixed page sizes, the output will show different dimensions for different pages, making it easy to identify which pages need resizing.

What about pages with different orientations?

Each page is reported independently. A document with mixed portrait and landscape pages will show different dimensions for different pages. The tool does not detect or report orientation - only raw width and height values.

What is the difference between MediaBox and CropBox?

MediaBox defines the physical page size. CropBox defines the visible area (what the user sees). If CropBox is set and smaller than MediaBox, only the CropBox area is displayed. This tool reports MediaBox, which is the actual page size.