Add documentation for all PDF tools

docs/tools/edit-pdf.md

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+---
+title: PDF Editor
+description: Annotate, highlight, redact, add shapes and images, search, and view PDFs directly in your browser.
+---
+
+# PDF Editor
+
+BentoPDF's PDF Editor lets you annotate, highlight, redact, comment, add shapes and images, and search through your PDFs. It loads a full-featured editor directly in your browser with no server uploads required.
+
+## How It Works
+
+1. Upload your PDF by clicking the drop zone or dragging a file onto it.
+2. The embedded PDF editor opens automatically with your document loaded.
+3. Use the toolbar to annotate, highlight, redact, add text, draw shapes, or insert images.
+4. Click **Download Edited PDF** to save your changes.
+
+## Features
+
+- Full annotation toolbar with highlighting, underlining, strikethrough, and freehand drawing
+- Text insertion and commenting
+- Redaction tools for permanently removing sensitive content
+- Shape tools for rectangles, circles, lines, and arrows
+- Image insertion onto PDF pages
+- Built-in text search across the document
+- Multi-document support with tabs (up to 10 documents open simultaneously)
+- Drag-and-drop file loading
+
+## Use Cases
+
+- Reviewing contracts and marking up changes with highlights and comments
+- Redacting confidential information like social security numbers or financial data before sharing
+- Adding annotations to architectural plans or engineering drawings
+- Inserting company logos or stamps onto document pages
+- Searching through lengthy legal documents for specific terms
+
+## Tips
+
+- You can open multiple PDFs at once and switch between them using the tab bar at the top of the editor.
+- The editor preserves the original PDF structure, so fonts, layouts, and form fields remain intact.
+- For bulk watermarking or page numbering, use the dedicated tools instead for more control over formatting.
+
+## Related Tools
+
+- [Add Watermark](./add-watermark)
+- [Sign PDF](./sign-pdf)
+- [Add Stamps](./add-stamps)
+- [Remove Annotations](./remove-annotations)