PDF Metadata Viewer

Introduction

Every PDF file you receive or create carries a hidden passenger: metadata. This is a structured collection of properties that describe the document beyond its visual content. The author's name, the software used to create it, exact creation and modification timestamps, and the document title — all of this lives silently in the background, often without the document creator realizing it's there.

This PDF Metadata Viewer extracts and displays all of these hidden properties in seconds, running entirely in your browser. It's useful for verifying document authenticity, auditing document history, understanding what information a PDF is broadcasting about its origins, or simply satisfying curiosity about an unknown file. No upload is required — your documents stay on your device.

Technical & Concept Breakdown

PDF metadata is stored in two primary locations within the file structure:

1. The Document Information Dictionary — Located near the end of the PDF, this dictionary contains standard key-value pairs. The keys follow the PDF spec:

• /Title — Document title
• /Author — Name of the author
• /Subject — Document subject/description
• /Keywords — Searchable tags
• /Creator — The original application (e.g., "Microsoft Word 2019")
• /Producer — The PDF conversion engine (e.g., "PDFKit 0.13", "Adobe PDF Library 21.x")
• /CreationDate — Format: D:YYYYMMDDHHmmSSOHH'mm' (a compact ISO-like timestamp)
• /ModDate — Date of last modification

2. XMP (Extensible Metadata Platform) — A more modern, XML-based metadata format embedded in the PDF's binary stream. Used by Adobe tools and newer authoring software, XMP can carry much richer structured metadata.

The tool uses pdf-lib or PDF.js to read the file locally and access the document's information dictionary without rendering any pages. The extraction is instantaneous and happens entirely in RAM.

Why does it matter? A document author field set to "John Smith" on what was claimed to be an anonymous letter immediately raises questions. A /Producer showing "PDF Redirect Professional" on a supposedly original signed contract suggests the file was re-printed from the internet. Metadata tells the story behind the story.

Real-World Use Cases

Journalists & Researchers: Verify the provenance of documents. Who created this file? When? Which software? These details can validate or challenge a document's claimed origins.

Legal Teams: Ensure docu...