Add documentation for all PDF tools

docs/tools/extract-pages.md

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+---
+title: Extract Pages
+description: Save a specific range of pages from a PDF as a new document.
+---
+
+# Extract Pages
+
+Pull a set of pages out of a PDF and save them as a new file. Specify exactly which pages you want using range syntax, and the tool creates a clean PDF containing only those pages.
+
+## How It Works
+
+1. Upload a PDF file. The tool displays the file name, size, and total page count.
+2. Enter the pages you want to extract using range syntax (e.g., `1-5`, `3, 7, 10-12`).
+3. Optionally choose to download each range as a separate PDF in a ZIP archive.
+4. Click the process button. The extracted pages download as a new PDF (or ZIP).
+
+## Features
+
+- Flexible page range syntax: individual pages, ranges, or comma-separated combinations
+- Displays total page count after upload for easy reference
+- Option to output as a single combined PDF or separate files in a ZIP
+- Preserves original page content and formatting
+
+## Use Cases
+
+- Pulling the executive summary (first few pages) out of a lengthy report
+- Extracting a single chapter from a textbook PDF
+- Saving specific pages from a form packet as standalone documents
+- Creating a sample document from selected pages of a larger file
+
+## Tips
+
+- Page numbers are 1-indexed. Use `1` for the first page, not `0`.
+- For removing pages instead of extracting them, use [Delete Pages](./delete-pages) -- it is the inverse operation.
+- If you need visual page selection with thumbnails, use [Split PDF](./split-pdf) in Visual Select mode.
+
+## Related Tools
+
+- [Split PDF](./split-pdf)
+- [Delete Pages](./delete-pages)
+- [Merge PDF](./merge-pdf)