What does this tool do?
It reads a PDF and lays out everything the file says about itself: how many pages it has and their physical sizes, the title, author, subject and keywords stored in its properties, which application created it, when it was created and last modified, and the PDF version it conforms to. One glance answers questions that would otherwise mean opening the file and digging through menus.
How to check a PDF's info
- Add the PDF with the upload box.
- The details appear immediately — no button to press, nothing uploaded.
- Page sizes are shown in points, millimetres and inches, and mixed-size documents list each distinct size found.
Why the metadata matters
Page count settles print quotes and reading estimates. Page size tells you whether that "A4" document is actually US Letter before you print a misaligned stack. The producer field reveals how a PDF was made — straight from Word, through a scanner, or via a converter — which explains a lot when text won't select or fonts look wrong. Creation and modification dates help you find the newest version of a much-forwarded file, and check consistency when a document's history matters.
The privacy angle cuts both ways
Reading metadata locally means your file stays private — nothing is uploaded to check it. But the metadata itself is worth a look before YOU share a document: the author field often carries a real name or a login, the title sometimes holds an internal draft name, and dates tell their own story. Knowing what a file says about itself is the first step to deciding whether you're happy for it to say it.
How it works
Mozilla's pdf.js parses the document structure in your browser and reports the fields stored in its information dictionary and metadata stream, along with per-page dimensions taken from each page's geometry. Nothing is modified — this tool is read-only.
Tips
- "Mixed sizes" is common in merged documents; the list shows every size present.
- A blank author or title isn't an error — many generators simply don't set them.