About the PDF page size checker

What Size Is My PDF? is a free tool that answers one question: what are the page sizes and related properties of a PDF on your device?

Select or drag and drop a PDF to see its page count, file size, page dimensions in millimeters and inches, recognized paper size (such as A4 or US Letter), orientation, and warnings when pages differ.

How it works

Analysis runs entirely in your web browser using Mozilla’s PDF.js library, which is bundled with this site. The browser reads your file locally with the File API. The PDF is not uploaded to a server for processing, storage, or analysis.

The tool inspects page metadata and dimensions only. It does not render page previews, extract text for you, edit the PDF, or convert the file.

What you do not need

• No account or sign-up
• No software install beyond a modern browser
• No payment to use the checker

Privacy

Your selected PDF stays in your browser for analysis. See the Privacy Policy for details about what this website does and does not do with files and page visits.

Check a PDF’s page size from the homepage.