Metadata

Metadata is the information about a PDF that is not part of the visible page: title, author, subject, keywords, the software that created it, and the dates it was made or last changed. It travels inside the file alongside the content, even though you never see it on the page.

This data is genuinely useful, it helps search engines and document systems index files, and it keeps libraries organized. But it can also leak more than you intend. A PDF you share might quietly reveal the original author's name, your company's internal software, or revision history you would rather not pass along.

When you are about to publish or send a PDF outside your organization, it is worth checking the metadata. Cleaning or editing those fields removes hidden details and keeps the file from saying more about you than the content itself does.