Add documentation for all PDF tools

docs/tools/powerpoint-to-pdf.md

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+---
+title: PowerPoint to PDF
+description: Convert PowerPoint presentations (PPT, PPTX) and ODP files to PDF with slide formatting preserved.
+---
+
+# PowerPoint to PDF
+
+Convert presentation files to PDF. Each slide becomes a page in the output document, with text, images, shapes, and transitions rendered through a browser-based LibreOffice engine. Supports both modern and legacy PowerPoint formats, plus the OpenDocument Presentation format.
+
+## Supported Formats
+
+| Format                    | Extensions |
+| :------------------------ | :--------- |
+| PowerPoint (modern)       | `.pptx`    |
+| PowerPoint (legacy)       | `.ppt`     |
+| OpenDocument Presentation | `.odp`     |
+
+## How It Works
+
+1. Click the upload area or drag and drop your presentation files.
+2. Review the file list. Add more or remove files as needed.
+3. Click **Convert to PDF**. The LibreOffice engine loads on first use, then converts each file.
+4. A single file downloads directly as a PDF. Multiple files are packaged into `powerpoint-converted.zip`.
+
+## Options
+
+This tool has no additional settings. Slides are rendered at their native dimensions.
+
+## Output
+
+| Input Count | Output                                                               |
+| :---------- | :------------------------------------------------------------------- |
+| 1 file      | Single PDF download (original filename with `.pdf` extension)        |
+| 2+ files    | ZIP archive (`powerpoint-converted.zip`) containing one PDF per file |
+
+## Use Cases
+
+- Converting a presentation to PDF before sharing with an audience that may not have PowerPoint
+- Creating a printable handout version of a slide deck for a conference or workshop
+- Archiving presentations in a format that renders identically on every device
+- Batch converting a library of ODP presentations from LibreOffice Impress to PDF
+- Producing a PDF version of a pitch deck for email attachments
+
+## Tips
+
+- Slide animations and transitions are not represented in the PDF. Each slide is captured as a static page.
+- Embedded videos will not appear in the output. Replace them with a screenshot or placeholder image if needed.
+- Speaker notes are not included in the default PDF export. If you need notes, consider exporting from PowerPoint's native "Print Notes" view first.
+- The LibreOffice engine caches after first load, so converting a second presentation in the same session is much faster.
+
+## Related Tools
+
+- [Word to PDF](./word-to-pdf)
+- [Excel to PDF](./excel-to-pdf)
+- [Images to PDF](./image-to-pdf)