Add documentation for all PDF tools

docs/tools/remove-annotations.md

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+---
+title: Remove Annotations
+description: Strip all comments, highlights, links, and other annotations from your PDF in one click.
+---
+
+# Remove Annotations
+
+Clean your PDF by removing all annotations -- comments, highlights, sticky notes, text markup, links, stamps, and any other annotation objects embedded in the document. The underlying page content (text, images, graphics) remains untouched.
+
+## How It Works
+
+1. Upload your PDF file.
+2. The tool detects the document's page count and displays file information.
+3. Click **Remove Annotations** to process.
+4. The cleaned PDF downloads automatically with all annotations stripped.
+
+## Features
+
+- Removes all annotation types: comments, highlights, underlines, strikethroughs, sticky notes, stamps, links, and form markup
+- Operates on every page in the document
+- Preserves all non-annotation content (text, images, vector graphics, form fields)
+- Displays page count and file size before processing
+
+## Use Cases
+
+- Cleaning up a document before final distribution after a review cycle where multiple reviewers added comments
+- Removing highlight markup and sticky notes from a shared study guide
+- Stripping link annotations from a document before archiving
+- Preparing a "clean" version of a legal document that was heavily annotated during negotiation
+- Removing reviewer comments from a manuscript before sending to print
+
+## Tips
+
+- This tool removes annotations at the PDF structure level, so the result maintains selectable text and original quality -- no rasterization involved.
+- If you only want to remove specific annotations rather than all of them, use the [PDF Editor](./edit-pdf) to selectively delete individual annotations.
+- Annotations in flattened PDFs (where annotations have been merged into the page content) cannot be removed since they are no longer separate objects.
+
+## Related Tools
+
+- [PDF Editor](./edit-pdf)
+- [Add Watermark](./add-watermark)
+- [Sign PDF](./sign-pdf)