PDF Page Size Checker: Step-by-Step Guide
Find the width, height, orientation and closest standard paper format for every PDF page. Export a report in points, inches and millimeters. This free PDF tool targets a specific document task rather than offering an unrelated bundle of features. Processing occurs locally after the JavaScript libraries load.
Disclosure: Some optional PDF workflow accessories linked below may be Amazon affiliate links. They are not needed to use this free tool.
How to Check the Page Size of a PDF
Choose a PDF document and click Check Page Sizes. The browser examines each page geometry and displays width, height, orientation, and a best-effort standard paper match. Change the display units between millimeters, inches, and PDF points, then download a CSV or JSON report. This is useful before printing, combining or sharing documents.
A4 vs US Letter PDF Dimensions
A4 paper measures approximately 210 × 297 mm, while US Letter measures 8.5 × 11 inches. They look similar on a screen, but content can be cropped or rescaled when printed on the wrong paper. US Legal is 8.5 × 14 inches. The checker compares dimensions with standard sizes using a small tolerance; custom-size pages may show no named match.
Mixed Sizes and Page Orientation
One PDF can contain portrait pages, landscape pages, appendices and scans with differing dimensions. Rather than reporting only the first page, this tool lists each page separately so you can catch inconsistent paper sizes before printing. Page rotation is taken into account in the displayed orientation.
PDF Points, Inches and Millimeters
Standard PDF coordinates use points, with 72 points per inch. This tool converts the displayed page dimensions into inches and millimeters for convenience. Some specialized PDFs use nondefault user units or unusual crop settings, so the reported effective page box can differ from what you expected from the original layout application.
Why PDF Size Matters for Printing
Page dimensions influence printer scaling, duplex alignment, booklet setup and margin planning. Confirm the intended paper stock in the print dialog; merely changing a page label does not alter the physical output size. If the source document is wrong, use a page-resizing tool and review the result before sending a large print job.
Private Browser-Based PDF Inspection
The analysis runs locally in your browser. The tool does not require uploading your documents to a remote PDF API. It reads PDF geometry but does not alter the source file. For documents containing unusually large pages or thousands of pages, performance depends on device memory.
Related PDF Workflows
Before editing the original file, consider making a backup. For complementary tasks try Resize PDF Pages, Crop PDF, or browse the More PDF Tools section.
Frequently Asked Questions
How can I tell if a PDF is A4 or Letter?
Upload the PDF and check the paper-format column. The tool compares dimensions against A4, US Letter and other common standards.
Does it detect different page sizes in one PDF?
Yes. It reports each page, including portrait, landscape and mixed-size documents.
Can I change PDF page size using this tool?
No. This is an inspector. Use Resize PDF Pages to change page dimensions.
Which measurement is accurate?
The PDF page geometry is reported in points and converted to inches or millimeters. It is not the page image resolution or DPI.