Add documentation for all PDF tools

docs/tools/remove-metadata.md

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+---
+title: Remove Metadata
+description: Strip all hidden metadata from PDF files including author, title, creation date, producer, XMP data, and document IDs.
+---
+
+# Remove Metadata
+
+Every PDF carries metadata that can reveal who created it, what software was used, when it was last modified, and more. This tool strips all of it -- the info dictionary, XMP metadata streams, document IDs, and application-specific data -- leaving a clean document with no trace of its origin.
+
+## How It Works
+
+1. Upload a PDF file.
+2. Click **Remove Metadata**.
+3. Download the cleaned file.
+
+No options to configure. The tool is thorough by design: it clears everything.
+
+## What Gets Removed
+
+- **Info dictionary fields**: Title, Author, Subject, Keywords, Creator, Producer, creation date, modification date
+- **XMP metadata stream**: The XML-based metadata block stored in the document catalog
+- **Document IDs**: Unique identifiers in the PDF trailer that can be used to track a document across systems
+- **PieceInfo**: Application-specific metadata added by programs like Illustrator or InDesign
+
+## What Stays
+
+- All visible page content (text, images, graphics)
+- Form fields and annotations
+- Bookmarks and links
+- The document structure itself
+
+## Use Cases
+
+- Removing your name and organization from a document before publishing it anonymously
+- Stripping creation timestamps that reveal when a document was prepared
+- Cleaning producer strings that identify your PDF software stack
+- Preparing documents for regulatory submissions that require metadata-free PDFs
+- Removing edit history traces before sharing a document externally
+
+## Tips
+
+- Use the View Metadata tool first to see exactly what metadata your PDF contains before stripping it.
+- If you need to remove metadata _and_ JavaScript, annotations, and embedded files, use Sanitize PDF for a more thorough cleaning.
+- Metadata removal is permanent. Keep your original if you might need that data later.
+
+## Related Tools
+
+- [Sanitize PDF](./sanitize-pdf) -- remove metadata plus scripts, attachments, and more
+- [Encrypt PDF](./encrypt-pdf) -- protect the cleaned PDF with a password
+- [Compress PDF](./compress-pdf) -- removing metadata can slightly reduce file size; compress for more savings