PDF Metadata

PDF Metadata works on the document information dictionary — the small block of text fields every PDF carries alongside its pages, and the thing your reader shows under File and then Properties. Read the metadata, the mode the tool opens in, parses the file with pdf-lib and reports eight of those fields back: Title, Author, Subject, Keywords, Creator, Producer, and the creation and modification dates. The page count and the file size are named beside them, so a document that says nothing about itself is as clear a result as one that describes itself in full.

Write new metadata turns the same fields into boxes you can type into. Only the boxes you fill are written, and anything you leave empty is passed over, so correcting one misspelt author name does not quietly blank the other entries. Keywords is the one field that does not survive intact: what you type is split on commas, and pdf-lib joins the pieces back together with spaces before they reach the file, so annual report, q3 finance is stored as annual report q3 finance and nothing downstream can tell where one keyword ended and the next began. The checkbox Blank fields clear the existing value inverts the rule when you want it inverted, and an empty box then writes an empty value over whatever was there. Every write also stamps the modification date with the moment you ran it, and returns a copy named after the original with -metadata added.

One boundary decides whether this is the right tool, and it is worth knowing before you trust a result. Only that information dictionary is read and written. Many PDFs carry a second copy of the same facts in an XMP packet, and this tool neither reads that packet nor updates it, so a file holding both can go on showing its old title in software that prefers XMP. Clearing is the other half of the same point: the clear option writes empty values, which is not the same as deleting the entries. Where the aim is to strip identifying fields before a file goes out rather than to correct them, Remove PDF Metadata deletes the entries outright and can drop the XMP stream with them.

The work is done by pdf-lib inside this tab, on your own processor, and no copy of the document goes to a server — which matters here because the fields under inspection are so often a colleague's full name, an internal file path, or the licensed copy of the software that made the file. Several documents can go through together: read mode lists each file's fields under its own name, and write mode applies the same values to every PDF in the queue and returns one edited copy each. A document that demands a password cannot be opened at all: the message names it and points at Unlock PDF, and because the whole queue is one job the run stops there, so the files that would have worked come back with nothing and have to be run again without the offender.

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