PDF metadata includes the document's title, author, subject, keywords, and creation date — stored invisibly in the file. Editing metadata improves document organization, searchability, and SEO for PDF files published online. Adobe Acrobat, ExifTool (free command-line), and browser-based tools can all modify PDF metadata.
Every PDF stores metadata in two places:
To view a PDF's metadata: in Adobe Acrobat, go to File > Properties. In Preview on Mac: Tools > Inspector > General tab.
Adobe Acrobat Reader (free) can view metadata (File > Properties) but cannot edit it. You need Acrobat Pro to make changes.
ExifTool is a powerful free command-line utility that reads and writes PDF metadata:
exiftool -Title="New Title" document.pdfexiftool -Author="Author Name" document.pdfexiftool -Keywords="keyword1, keyword2" document.pdfPreview can display PDF metadata but does not offer an interface to edit most fields. For basic changes, third-party Mac apps like PDF Expert can edit metadata.
Before sharing a PDF externally, consider removing metadata that reveals internal information:
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Protect PDFExifTool (free command-line) is the most powerful free metadata editor for PDFs. On Mac, PDF Expert can edit metadata with its free tier. Adobe Acrobat Reader can view but not edit metadata — Pro is needed for editing via Acrobat.
PDF metadata is invisible data embedded in the file including Title, Author, Subject, Keywords, and creation date. It affects search engine indexing, document accessibility, organization in file managers, and can reveal private information about the document's history.
Yes. ExifTool can strip all metadata with: exiftool -all= document.pdf. Adobe Acrobat Pro has a Sanitize Document feature that removes metadata, hidden layers, and embedded content. This is important before sharing sensitive documents publicly.
Yes. Google indexes PDF content and metadata. A properly set Title tag improves how the PDF appears in search results. Keywords and Description fields can also influence indexing. PDFs hosted on your website benefit from the same metadata SEO principles as web pages.
In Adobe Acrobat: File > Properties (Ctrl+D). In Preview on Mac: Tools > Inspector. In Chrome browser: open the PDF, press Ctrl+D to view properties. ExifTool command: exiftool document.pdf displays all metadata fields.