Read the Document Facts
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Page count, page sizes, file size, whether it is encrypted, and the properties it carries.
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How many pages is it. Are they all the same size. Is it encrypted. Those three answers decide whether a split will fit under the page ceiling, whether an N-up layout will look even, and whether a tool will refuse the file before it starts.
Answering them by opening the document in a reader and hunting through a properties dialog is slower than uploading it here.
The document is read and never rewritten, so there is nothing to download and nothing to undo.
No. This tool only reads. Nothing is written back and there is no download, because there is no new file to give you.
Because the document holds more than one page size, which is normal when a landscape appendix or a scanned insert sits inside a portrait report. Every distinct size found is listed.
It reports that a document is encrypted, which is the answer you need. The page count and properties of a protected file cannot be read without its password, so those come back empty.
The software that last wrote the file. It is often the clearest evidence of where a document came from, such as a scanner model or the library a system used to generate it.
Measuring every page of a long document is work with no extra answer in it. The report tells you when it has described a sample rather than the whole file.