Lock PDF

Password-protect and restrict permissions on your PDF documents.

Drag & Drop PDF File Here

or

No file selected.
Security Options

Setting a Permissions Password enables the options below.

User Permissions (If Permissions Password is set):
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How to Lock PDF

Secure your PDF documents with custom encryption cleanly — our local security engine adds password protection and restriction parameters within your browser workspace.

1

Upload PDF Document

Drag and drop your file or click to select a document from your local storage directories.

2

Configure Password Rules

Input your secure user or owner passwords, and set printing, copying, or content extraction permission flags.

3

Apply Encryption

The browser local compiler encrypts the document layers using industry-standard RC4 or AES security layers.

4

Save Secured PDF

Download your newly encrypted, password-locked PDF document instantly with original visual layers intact.

🔒 Standard Browser Security Sandbox

Your data assets remain strictly private. Document parsing functions utilize local machine memory engines exclusively — zero server transmissions, zero external logs.

Key PDF Locking Features

Dual-Password Security

Configure separate passwords for opening the document (user password) and modifying permissions (owner password).

Print Controls

Restrict document print actions entirely or limit them to low-resolution output modes to prevent unauthorized distribution.

Clipboard Restrictions

Disable text and image extraction controls to prevent readers from copying content details to their clipboard.

AES-256 Bit Encryption

Protect file assets using robust cryptographic standards, preventing password cracking tools from accessing content.

Sandboxed Cryptographic Engine

Processes document bytes and applies security encryption parameters entirely client-side. Because no files are uploaded to our servers, your private documents and passphrases are never exposed.

Frequently Asked Questions

1 What is the difference between a user password and an owner password?
A user password restricts who can open and view the PDF. An owner password restricts document actions like printing, editing, or copying, allowing you to control how the document is used.
2 Can a password-locked PDF be opened in standard PDF viewers?
Yes. Output files conform to standard PDF security specs. Standard readers (like Acrobat Reader, Chrome, or Edge) will prompt users for the password before rendering contents.
3 What encryption standard does the lock tool apply?
The tool supports high-security 128-bit and 256-bit AES encryption schemes, which are standard for securing enterprise, banking, and government PDF assets.
4 Can I remove security restrictions if I forget my password?
To protect files, there is no backdoor password recovery. Ensure you save your owner passwords securely elsewhere, as locked files cannot be unlocked without the key.
5 Are passwords or document contents tracked online?
Absolutely not. The encryption process occurs entirely within your browser's sandboxed local script runtime. We do not store or track your passwords or documents.