Add documentation for all PDF tools

docs/tools/organize-pdf.md

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+---
+title: Organize & Duplicate
+description: Reorder, duplicate, and delete PDF pages with drag-and-drop thumbnails and custom page order input.
+---
+
+# Organize & Duplicate
+
+Rearrange, duplicate, and remove pages from a PDF using a visual drag-and-drop interface. Each page appears as a thumbnail that you can move, clone, or delete before saving the result as a new file.
+
+## How It Works
+
+1. Upload a single PDF file.
+2. The tool renders a thumbnail grid showing every page.
+3. Drag thumbnails to reorder pages, click the green duplicate button to clone a page, or click the red delete button to remove one.
+4. Alternatively, enter a custom page order in the text field (e.g., `3, 1, 2, 4`) and click **Apply** to rearrange all pages at once.
+5. Click the process button to build and download the reorganized PDF.
+
+## Features
+
+- Drag-and-drop page reordering with animated transitions
+- Per-page duplicate and delete buttons
+- Custom page order input for precise rearrangement
+- Page number labels that update automatically after every change
+- Prevents deleting the last remaining page
+
+## Use Cases
+
+- Moving a misplaced page to the correct position in a report
+- Duplicating a form page so you have multiple blank copies in one file
+- Removing draft or placeholder pages before distributing a document
+- Reversing or shuffling page order for print preparation
+- Building a custom page sequence without re-merging separate files
+
+## Tips
+
+- The custom page order field expects comma-separated original page numbers. It must include every page exactly once -- no omissions or duplicates.
+- After duplicating a page, both copies reference the same original page index. Reordering either copy works independently.
+- For bulk operations across multiple files or more advanced workflows, consider the [PDF Multi Tool](./pdf-multi-tool) instead.
+
+## Related Tools
+
+- [Merge PDF](./merge-pdf)
+- [Delete Pages](./delete-pages)
+- [PDF Multi Tool](./pdf-multi-tool)
+- [Reverse Pages](./reverse-pages)