Checking what is really inside a PDF
Inspection tools are for the moments when a PDF behaves strangely or you need to know exactly what you received. A file may have the right extension but still contain unusual page sizes, hidden metadata, embedded fonts, broken objects, unexpected attachments, or structural issues that only show up during printing, archiving, or upload. Looking at the document's properties before editing can save time when the real problem is not visible on the page.
Use these tools when a PDF fails a submission check, opens differently across devices, or has an unexpectedly large file size. The most useful approach is to inspect first and change second. Record the page count, dimensions, metadata, and other basic properties before you start cleaning or rebuilding the file, so you can tell whether a later change actually fixed the issue.