PDF Page Size Checker
Check PDF page dimensions in points, inches, millimeters, and likely paper size directly in your browser. Use it before printing, submitting artwork, uploading forms, or checking whether a file is A4, Letter, Legal, A3, A5, or a custom trim size. Everything runs locally with no signup and no server upload.
This lightweight checker reads PDF page box data from the file text. It reports unique MediaBox or CropBox dimensions so you can spot mixed page sizes, print-size mistakes, and files that were exported at the wrong paper format. Complex compressed PDFs may need a dedicated PDF library, but many exported PDFs work instantly.
Frequently asked questions
What does the checker read?
It looks for PDF MediaBox or CropBox values that define page dimensions. The result includes points, inches, millimeters, and the closest common paper size.
Are files uploaded?
No. The PDF is read locally in your browser, which makes it useful for drafts, forms, client proofs, and internal documents.
Can it find A4 or Letter pages?
Yes. It compares the extracted dimensions with common paper sizes such as A4, Letter, Legal, A3, and A5 and labels close matches.
Why might some PDFs fail?
Some PDFs compress or encode page dictionaries in ways this lightweight checker cannot read without a full PDF parser.
PDF size checking tips
Most PDFs store page dimensions in points, where 72 points equals one inch. If a print shop asks for inches or millimeters, use the converted dimensions to confirm the exported PDF matches the requested trim size before sending it.
Common page-size mistakes
Watch for slides exported as Letter instead of widescreen, invoices mixed between A4 and Letter, or design files missing bleed. If the checker reports more than one unique page box, review the PDF before printing or merging it with other files.