Add documentation for all PDF tools

docs/tools/wpd-to-pdf.md

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+---
+title: WPD to PDF
+description: Convert WordPerfect (WPD) documents to PDF in your browser using LibreOffice. Free and private.
+---
+
+# WPD to PDF
+
+Convert Corel WordPerfect documents into PDF files. WPD was once the dominant word processing format in legal offices and government agencies. If you have old WordPerfect files that modern software refuses to open, this tool brings them back to life as standard PDFs.
+
+## Supported Formats
+
+| Format      | Extension | Notes                          |
+| :---------- | :-------- | :----------------------------- |
+| WordPerfect | `.wpd`    | All major WordPerfect versions |
+
+## How It Works
+
+1. Click the upload area or drag and drop your WPD files. Multiple files can be selected at once.
+2. Review the file list. Remove unwanted files with the trash icon, or use **Add More Files** to add more documents.
+3. Click **Convert to PDF**. The tool loads a LibreOffice-based conversion engine in your browser, which parses the WPD format and outputs PDF.
+4. A single file downloads directly as a PDF. Batch conversions produce a ZIP archive named `wpd-to-pdf.zip`.
+
+## Options
+
+No configuration is required. The LibreOffice engine handles WPD formatting, fonts, and layout automatically.
+
+## Use Cases
+
+- Opening decades-old legal documents written in WordPerfect
+- Converting archived government filings from WPD to a modern format
+- Migrating a legacy WordPerfect document library to PDF for long-term storage
+- Sharing WPD files with recipients who don't have Corel WordPerfect installed
+
+## Tips
+
+- The LibreOffice engine loads on first use, which takes a moment. Subsequent conversions in the same session are faster.
+- Complex WPD macros and reveal codes are not preserved, but the visual layout, text content, and basic formatting carry over to PDF.
+
+## Related Tools
+
+- [WPS to PDF](./wps-to-pdf)
+- [ODG to PDF](./odg-to-pdf)