Add documentation for all PDF tools

docs/tools/word-to-pdf.md

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+---
+title: Word to PDF
+description: Convert Word documents (DOC, DOCX), ODT, and RTF files to PDF in your browser with full formatting preservation.
+---
+
+# Word to PDF
+
+Convert Microsoft Word documents and compatible formats to PDF. The tool uses a browser-based LibreOffice engine that handles DOC, DOCX, ODT, and RTF files, preserving formatting, tables, images, headers, footers, and styles in the output.
+
+## Supported Formats
+
+| Format            | Extensions |
+| :---------------- | :--------- |
+| Word (modern)     | `.docx`    |
+| Word (legacy)     | `.doc`     |
+| OpenDocument Text | `.odt`     |
+| Rich Text Format  | `.rtf`     |
+
+## How It Works
+
+1. Click the upload area or drag and drop your Word documents. Multiple files can be selected at once.
+2. Review and manage the file list.
+3. Click **Convert to PDF**. The LibreOffice engine loads on first use (a progress indicator shows the initialization status), then each file is converted.
+4. A single file downloads directly as a PDF. Multiple files are packaged into `word-converted.zip`.
+
+## Options
+
+This tool has no additional settings. The LibreOffice engine produces the output using its default PDF export profile.
+
+## Output
+
+| Input Count | Output                                                         |
+| :---------- | :------------------------------------------------------------- |
+| 1 file      | Single PDF download (original filename with `.pdf` extension)  |
+| 2+ files    | ZIP archive (`word-converted.zip`) containing one PDF per file |
+
+## Use Cases
+
+- Converting a resume or cover letter from DOCX to PDF before submitting a job application
+- Batch converting a set of contracts or proposals to PDF for a client delivery
+- Turning legacy `.doc` files into modern PDFs for long-term archival
+- Converting collaborative documents from Google Docs (exported as DOCX) to PDF
+- Producing print-ready PDFs from Word templates used by automated document generation
+
+## Tips
+
+- The LibreOffice engine is downloaded once per session and cached. Expect a few seconds of loading time on the first conversion, with subsequent conversions being much faster.
+- Complex formatting (macros, ActiveX controls, advanced SmartArt) may not convert perfectly. Standard document elements -- text, tables, images, headers, footnotes -- convert reliably.
+- Since this tool also accepts ODT and RTF, you can use it as a one-stop converter for all word processing formats.
+
+## Related Tools
+
+- [ODT to PDF](./odt-to-pdf)
+- [RTF to PDF](./rtf-to-pdf)
+- [Excel to PDF](./excel-to-pdf)
+- [PowerPoint to PDF](./powerpoint-to-pdf)