Convert PDF to password-protected PDF
Add password protection to your PDF files to control access and permissions. Browser-based, no upload required.
Drag & drop files here, or click to browse
Accepts: PDF
Batch conversion supported — add multiple files at once
Private & Secure
Files never leave your device. All processing happens locally in your browser.
Completely Free
No subscription, no watermarks, no file limits. Free forever.
Batch Conversion
Convert dozens of files at once with individual progress tracking.
Lightning Fast
Powered by your device's hardware. No server round-trips.
What is Convert PDF to password-protected PDF?
PDF files often contain sensitive information — contracts, financial statements, personal records, or confidential business documents. Adding password protection ensures that only authorized recipients can open and view your PDFs, with optional restrictions on printing, copying, and editing.
PDF protection supports two types of passwords: an open password that is required to view the document, and a permissions password that controls whether recipients can print, copy text, or modify the document. Using both provides comprehensive security for your sensitive documents.
How to Calculate
- Drop your PDF file(s) into the converter or click to select them
- Set an open password (required to view the PDF)
- Optionally set permissions (allow/deny printing, copying, editing)
- Click Protect to apply — encryption happens in your browser
- Download your protected PDF file(s)
Key Benefits
- Control who can open and view your PDF documents
- Restrict printing, copying, and editing of your PDFs
- Industry-standard 128-bit AES encryption for document security
- No software installation required — works entirely in your browser
- 100% private with client-side processing
Common Use Cases
- Protecting confidential business contracts and agreements before sharing
- Securing financial statements, tax documents, and bank records
- Adding password protection to personal legal documents and wills
- Controlling distribution of proprietary reports and presentations
- Restricting printing and copying of sensitive educational materials
Key Terms Explained
- AES Encryption
- Advanced Encryption Standard (128-bit) used to secure PDF content. The industry-standard encryption method for document protection.
- Open Password
- A password required to open and view the PDF. Without this password, the document cannot be accessed at all.
- Permissions Password
- A secondary password that controls whether users can print, copy content, or modify the document after opening it.
Pro Tips
- Use strong passwords (12+ characters with mixed case, numbers, and symbols) for maximum security
- Never share the password in the same email or message as the protected PDF
- Store passwords in a secure password manager — PDF password recovery is extremely difficult
- Permissions restrictions are enforced by compliant PDF readers, but determined users may find ways around them
PDF Encryption
PDF protection uses 128-bit AES encryption to secure document content. The encrypted PDF can only be opened with the correct password.
Permission Controls
PDF permissions allow document owners to restrict printing, content copying, commenting, and page extraction. These are enforced by standards-compliant PDF readers.
Frequently Asked Questions
Can I remove password protection from a PDF?↓
Use the PDF Unlock tool to remove password protection from PDFs where you know the password.
How secure is PDF password protection?↓
128-bit AES encryption is the industry standard for document security. It is effectively unbreakable with current technology when strong passwords are used.
Can I add both open and permissions passwords?↓
Yes. You can set separate passwords for opening the document and for changing permissions.
What happens if I forget the password?↓
PDF passwords cannot be recovered. Store your passwords in a password manager or secure location.
Will the protected PDF work on all devices?↓
Yes. AES-encrypted PDFs can be opened in any standards-compliant PDF reader (Adobe Acrobat, Preview, browser PDF viewers, etc.).
Is this free and secure?↓
Yes, completely free. All encryption happens in your browser — your password and files never leave your device.