Add documentation for all PDF tools

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+---
+title: Split PDF
+description: Split a PDF into smaller files by page range, visual selection, bookmarks, even/odd pages, or fixed intervals.
+---
+
+# Split PDF
+
+Break a PDF into smaller documents using one of six splitting modes. From simple page ranges to bookmark-based splitting, this tool handles every scenario for dividing a document.
+
+## How It Works
+
+1. Upload a single PDF file.
+2. Choose a split mode from the dropdown.
+3. Configure the mode-specific options (page ranges, selections, etc.).
+4. Click the process button.
+5. The result downloads as a single PDF or a ZIP archive depending on the mode and settings.
+
+## Split Modes
+
+| Mode              | Description                                                                                                             |
+| ----------------- | ----------------------------------------------------------------------------------------------------------------------- |
+| **Range**         | Enter page ranges like `1-3, 5, 8-10`. Multiple ranges produce separate PDFs in a ZIP. A single range produces one PDF. |
+| **Visual Select** | Browse page thumbnails and click to select the pages you want. Selected pages are extracted into a new PDF.             |
+| **Even / Odd**    | Extract only even-numbered or odd-numbered pages.                                                                       |
+| **All Pages**     | Split every page into its own individual PDF file, downloaded as a ZIP.                                                 |
+| **Bookmarks**     | Split at bookmark boundaries. Choose the bookmark level to control where splits occur.                                  |
+| **Every N Pages** | Split into chunks of N pages each (e.g., every 5 pages). The last chunk may have fewer pages.                           |
+
+## Features
+
+- Six distinct splitting modes covering virtually every use case
+- Visual page selector with lazy-loaded thumbnails
+- Bookmark-aware splitting with level filtering
+- ZIP output option for range and visual modes
+- Handles page ranges with mixed syntax (`1-3, 5, 8-10`)
+- Warning when N-page splits result in uneven chunks
+
+## Use Cases
+
+- Extracting a specific chapter or section from a large document
+- Separating odd and even pages for double-sided printing workflows
+- Breaking a book PDF into individual chapter files at bookmark boundaries
+- Isolating specific pages (like a signature page) from a contract
+- Splitting a compiled report into per-section files for distribution
+
+## Tips
+
+- Multiple page ranges separated by commas (e.g., `1-5, 10-15, 20-25`) produce separate PDFs, one per range, bundled in a ZIP.
+- The bookmark split mode requires the PDF to actually contain bookmarks. If none are found, you will get an error message.
+- The "Download as ZIP" checkbox in Range and Visual modes lets you get individual PDFs per page instead of a combined file.
+
+## Related Tools
+
+- [Merge PDF](./merge-pdf)
+- [Extract Pages](./extract-pages)
+- [Delete Pages](./delete-pages)
+- [PDF Multi Tool](./pdf-multi-tool)