PDFInfo is a highly efficient command-line utility that extracts comprehensive metadata from PDF files. Part of the open-source Poppler (and historically Xpdf) suite, it allows you to instantly scan a PDF’s structural properties, creation details, and security restrictions directly from your terminal. 1. Installation
Before using the tool, you must install the Poppler utilities package on your operating system. Linux (Ubuntu/Debian): Run sudo apt install poppler-utils. macOS: Install via Homebrew using brew install poppler.
Windows: Download the compiled binaries from the official XpdfReader website or install via Chocolatey using choco install xpdf. 2. Basic Metadata Extraction
To pull the standard metadata dictionary from a PDF, open your terminal and point the tool at your target file. pdfinfo document.pdf Use code with caution. What the Standard Output Reveals
Running this command will immediately display structural and descriptive properties:
Descriptive Information: Title, Subject, Keywords, and Author.
Origins: The Creator (the application that generated the original document) and the Producer (the engine converting it to PDF).
Timestamps: CreationDate and ModDate (Modification Date) tracking the exact timeline of the document.
Dimensions & Layout: Page count, specific page sizes (e.g., Letter, A4), page rotation angle, and whether the document is optimized for the web.
Security & Versions: Encryption status and the precise PDF format version (e.g., 1.7). 3. Advanced Arguments and Flags
You can append flags to the core command to customize your extraction requirements. Command Flag Operational Purpose pdfinfo -meta document.pdf
Extracts the raw, unedited XML-formatted XMP stream embedded inside the PDF. pdfinfo -box document.pdf
Outputs explicit bounding box dimensions, including MediaBox, CropBox, and BleedBox. pdfinfo -isodates document.pdf
Standardizes all output timestamps into a clean, ISO-8601 compliant timezone format. pdfinfo -js document.pdf
Scans and pulls all JavaScript blocks hidden inside the interactive fields of the file. pdfinfo -url document.pdf
Crawls the file structure to list every linked URL embedded within the PDF annotations. 4. Bypassing Password Restrictions
If a PDF file is encrypted, the software will block data extraction unless you supply the password explicitly during the execution command.
User Password Required: Pass the user-level credential directly using the -upw flag. pdfinfo -upw “UserPassword123” encrypted_document.pdf Use code with caution.
Owner Password Required: Pass the master/owner administrative credential using the -opw flag to cleanly bypass all security parameters. pdfinfo -opw “OwnerPassword123” encrypteddocument.pdf Use code with caution. 5. Automated Batch Processing
For developers or systems administrators looking to extract fields across thousands of system files at once, you can pair the utility with native shell scripting loops. Linux / macOS Bash Script
This automation iterates through all local PDF documents, executing the tool and storing the consolidated metrics directly into a single text document.
for file in.pdf; do echo “— METADATA FOR: \(file ---" >> summary.txt pdfinfo "\)file” >> summary.txt done Use code with caution. Windows PowerShell Script
This loop captures the structural attributes for all folder contents and neatly redirects the resulting output logs. powershell
Get-ChildItem *.pdf | ForEach-Object { Add-Content -Path “summary.txt” -Value “— METADATA FOR: \((\).Name) —” & pdfinfo $_.FullName | Out-File -FilePath “summary.txt” -Append } Use code with caution.
Or are you looking to completely strip out metadata from your target documents for security reasons? Perhaps you need specific help extracting embedded images from your PDFs instead? Discovering metadata about a PDF
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