Add documentation for all PDF tools

docs/tools/odp-to-pdf.md

@@ -0,0 +1,44 @@
+---
+title: ODP to PDF
+description: Convert LibreOffice Impress (ODP) presentations to PDF in your browser. Free, private, no upload.
+---
+
+# ODP to PDF
+
+Convert OpenDocument Presentation files into PDF. ODP is the native format for LibreOffice Impress and a standard export from Google Slides. Turning presentations into PDFs means anyone can view them without presentation software, and the slides print cleanly.
+
+## Supported Formats
+
+| Format                    | Extension | Notes                                      |
+| :------------------------ | :-------- | :----------------------------------------- |
+| OpenDocument Presentation | `.odp`    | LibreOffice Impress / Google Slides export |
+
+## How It Works
+
+1. Click the upload area or drag and drop your ODP files. You can select multiple presentations at once.
+2. Review the file list. Remove entries with the trash icon, or use **Add More Files** to include additional presentations.
+3. Click **Convert to PDF**. The LibreOffice-based engine processes each presentation and produces a PDF where every slide becomes a page.
+4. A single file downloads as a PDF. Multiple files are delivered in a ZIP archive named `odp-to-pdf.zip`.
+
+## Options
+
+No settings to configure. Each slide is rendered at its original dimensions, preserving text, images, shapes, and slide backgrounds.
+
+## Use Cases
+
+- Distributing a presentation to an audience as a handout PDF
+- Sharing Google Slides exports with people who prefer PDF over ODP
+- Archiving conference talks and lectures in a read-only format
+- Printing slide decks for in-person workshops
+
+## Tips
+
+- Slide transitions and animations are visual-only features that do not carry into PDF, but all static content renders correctly.
+- Speaker notes are not included in the PDF output. If you need notes, export them separately from your presentation software.
+- Like the other LibreOffice-based tools, the engine loads on first use and stays cached for the session.
+
+## Related Tools
+
+- [ODG to PDF](./odg-to-pdf)
+- [ODS to PDF](./ods-to-pdf)
+- [PUB to PDF](./pub-to-pdf)