Add documentation for all PDF tools

docs/tools/remove-restrictions.md

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+---
+title: Remove Restrictions
+description: Remove password protection, printing restrictions, editing locks, and copying limits from PDF files.
+---
+
+# Remove Restrictions
+
+PDFs can carry two types of passwords: a user password (required to open the file) and an owner password (controls what you can do with it). This tool strips both, along with all associated restrictions -- printing, editing, copying, and annotation locks.
+
+## How It Works
+
+1. Upload a PDF file.
+2. If the PDF has an owner password, enter it in the **Owner Password** field. Leave it blank if the PDF only has usage restrictions without a password.
+3. Click **Remove Restrictions**.
+4. Download the unrestricted PDF.
+
+The tool uses QPDF's `--decrypt` and `--remove-restrictions` flags to produce a clean, unrestricted copy.
+
+## What Gets Removed
+
+- Password protection (both user and owner passwords)
+- Printing restrictions
+- Editing restrictions
+- Text and image copying restrictions
+- Annotation and commenting restrictions
+- All other security limitations encoded in the PDF
+
+## Use Cases
+
+- Unlocking a PDF you own but whose password you set years ago
+- Removing print restrictions from a document you have legitimate access to
+- Enabling copy-paste on reference materials for note-taking
+- Preparing PDFs for accessibility tools that cannot handle restricted documents
+
+## Tips
+
+- You must know the owner password if one is set. This tool does not crack or brute-force passwords.
+- If you need to keep the file encrypted but change specific permissions, use the Change Permissions tool instead.
+- The output file has zero encryption -- anyone who receives it can open it freely.
+
+## Related Tools
+
+- [Decrypt PDF](./decrypt-pdf) -- unlock a PDF when you know the user password
+- [Encrypt PDF](./encrypt-pdf) -- re-apply encryption with new settings
+- [Change Permissions](./change-permissions) -- selectively modify which actions are allowed