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Protect PDF

Add password protection and set permissions for your PDF — entirely in your browser.

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.pdf

About Protect PDF

Add password protection and control what users can do with your PDF document.

  • User Password — required to open and view the document
  • Owner Password — controls permission settings (printing, copying, editing)
  • Permissions — fine-grained control over what actions are allowed

All processing happens locally in your browser using pdf-lib. No files are uploaded to any server.

Technical Specification

PDF Password Protection & Encryption Engine

Overview

The ToolsForges Protect PDF tool applies password protection and encryption to PDF documents, restricting access and preventing unauthorized viewing, editing, or printing — all executed entirely within the browser. Upload a PDF, set owner and user passwords, configure permission levels, and receive an encrypted PDF that requires the correct password to open or modify.

Feature Specifications

  • Dual Password ProtectionSet separate user passwords (required to open the document) and owner passwords (required to modify permissions), enabling different access levels for viewing versus editing.
  • Granular Permission ControlsConfigure specific permissions for printing, copying text, editing content, and adding annotations, creating tiered access control for different user roles.
  • AES-256 EncryptionApply industry-standard AES-256 encryption to the document content stream, providing strong protection that meets compliance requirements for sensitive document handling.
  • Instant EncryptionEncrypt PDF files instantly within the browser without server-side processing, enabling rapid document protection for time-sensitive workflows.

Architecture

The protection tool uses PDF encryption libraries running in the browser to apply password protection and AES-256 encryption to document content streams. The encryption process modifies the PDF structure to require password authentication.

Frequently Asked Questions

How strong is PDF encryption?

AES-256 encryption is the current industry standard for PDF protection, used by government agencies and enterprises for classified document handling.

Can I protect already-encrypted PDFs?

The current implementation processes unprotected PDF files. To change encryption on an already-protected document, it must first be decrypted with the existing password.

Will encryption affect PDF quality?

Encryption modifies the document structure for access control but does not alter the visual content. Text, images, vectors, and all visual elements remain unchanged.

Is my PDF data stored?

No. All uploaded PDF files, passwords, and encrypted output are processed entirely within your browser. No document content or encryption credentials are transmitted externally.