Add documentation for all PDF tools

docs/tools/reverse-pages.md

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+---
+title: Reverse Pages
+description: Flip the page order of one or more PDF files so the last page becomes the first.
+---
+
+# Reverse Pages
+
+Reverse the page order of a PDF so the last page becomes the first, the second-to-last becomes the second, and so on. Supports batch processing of multiple files at once.
+
+## How It Works
+
+1. Upload one or more PDF files.
+2. Click the process button.
+3. Each file is reversed independently. If you uploaded multiple files, the output is a ZIP archive containing all reversed PDFs.
+4. A single file downloads directly as a reversed PDF.
+
+## Features
+
+- Batch processing: reverse multiple PDFs in one operation
+- Single-file output for one PDF, ZIP output for multiple
+- Per-file removal buttons before processing
+- Preserves all page content and formatting
+
+## Use Cases
+
+- Fixing a document that was scanned in reverse order
+- Preparing a presentation PDF to read from back to front
+- Reversing page order for specific printing workflows that feed pages in reverse
+- Correcting a document where pages were accidentally assembled backwards
+
+## Tips
+
+- Each file in a batch is reversed independently -- the files themselves are not reordered relative to each other.
+- For more granular page reordering (not just a full reversal), use [Organize & Duplicate](./organize-pdf).
+
+## Related Tools
+
+- [Organize & Duplicate](./organize-pdf)
+- [Rotate PDF](./rotate-pdf)
+- [PDF Multi Tool](./pdf-multi-tool)