Add documentation for all PDF tools

docs/tools/edit-attachments.md

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+---
+title: Edit Attachments
+description: View and selectively remove file attachments embedded in a PDF document.
+---
+
+# Edit Attachments
+
+Inspect and manage the file attachments inside a PDF. The tool lists every embedded file with its name and attachment level, then lets you mark individual attachments for removal or strip them all at once.
+
+## How It Works
+
+1. Upload a PDF file.
+2. The tool automatically scans for attachments and displays them in a list.
+3. Each attachment shows its file name and whether it is a document-level or page-level attachment.
+4. Click the trash icon next to an attachment to mark it for removal (click again to unmark).
+5. Use the **Remove All Attachments** button to select everything at once, or **Deselect All** to clear your selections.
+6. Click the process button to save a new PDF with the selected attachments removed.
+
+## Features
+
+- Lists all document-level and page-level attachments
+- Individual or bulk attachment removal
+- Toggle selection on and off before committing changes
+- Visual strikethrough and opacity change on items marked for removal
+- Downloads the modified PDF with selected attachments stripped
+
+## Use Cases
+
+- Removing outdated or incorrect files embedded in a document before redistribution
+- Stripping sensitive attachments (financial data, personal info) from a PDF before sharing
+- Reducing PDF file size by removing large embedded files that are no longer needed
+- Auditing embedded content and cleaning up a document before archiving
+
+## Tips
+
+- Marked-for-removal attachments are shown with a visual strikethrough. You can toggle them back before processing if you change your mind.
+- If no attachments are found, the tool displays a clear "No attachments found" message -- the PDF simply does not contain embedded files.
+
+## Related Tools
+
+- [Add Attachments](./add-attachments)
+- [Extract Attachments](./extract-attachments)
+- [View Metadata](./view-metadata)