Lock sensitive financial files
Quarterly statements shared externally
Input: plain PDF document
Output: password-protected PDF
Result: controlled access before distribution
Protect PDF
Password-protect and encrypt PDF files for free. Add security to any PDF document — processed entirely in your browser for total privacy.
FreeNo signupPrivate - browser only
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How to protect pdf
1
Upload your PDF
Drag and drop the document you want to protect.
2
Set passwords and permissions
Choose an open password, permissions password, or both. Configure printing and copying restrictions.
3
Download the protected PDF
Get your encrypted, password-protected document — secure and ready to share.
Real output examples
Typical before/after outcomes for common protect pdf workflows.
Restrict print/copy permissions
Internal policy file
Input: editable PDF
Output: encrypted PDF with permission controls
Result: lower accidental data exposure risk
About Protect PDF
Secure your PDF documents with password protection and encryption using PDF Shuttle's free Protect PDF tool. Set a password that recipients must enter to open the document, or add an owner password to control printing, copying, and editing permissions.
The tool uses RC4 128-bit encryption to protect your files, a widely-supported standard compatible with all PDF readers. Set a user password (required to view the document) and optionally a separate owner password (restricts what users can do with the document).
All encryption runs entirely in your browser — your files and passwords are never sent to any server. This is the most private way to protect sensitive documents: financial records, legal contracts, medical documents, and confidential business materials.
Why use Protect PDF
- RC4 128-bit encryption for strong security
- User password to restrict document access
- Owner password for print, copy, and edit restrictions
- Compatible with all major PDF readers
- Processed entirely in your browser — passwords never sent to a server
- No watermarks, no signup, completely free
- Works on desktop, tablet, and mobile
Protect PDF - Frequently Asked Questions
Common questions about Protect PDF.
RC4 128-bit encryption, a widely-supported standard compatible with virtually every PDF reader. It provides strong protection against unauthorized access.
An open password is required to view the document. A permissions password restricts actions like printing, copying text, and editing, but the document can still be viewed.
Yes. Set permissions to prevent printing, prevent copying text, or prevent editing — independently or in combination.
Yes. Encryption runs entirely in your browser. Your files and passwords are never sent to any server.
Yes, if you know the password. Use our Unlock PDF tool to remove password protection from any PDF you own.
Minimally. Encryption adds a small amount of overhead, but the file size increase is negligible for most documents.
No. The tool is completely free with no registration, no watermarks, and no limits.
Guides for Protect PDF
Learn workflows, tips, and best practices before you process your file.
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