How secure is the encryption?

We use AES-256 encryption, the same standard used by banks and governments.

Lock PDF Files

FreePrivateInstant

Click to upload or drag and drop

PDF file only (max 50MB)

Tips for better compression:

• PDFs with images compress better than text-only documents
• Higher compression may reduce image quality
• Use "Medium" for most documents
• Use "Extreme" for email attachments

Lock your PDF files with a password. Prevent unauthorized access.

Quick Links

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What is Lock PDF with Password?

Add password protection to PDF files. Secure your documents with encryption. Our free online tool makes it easy to add password to pdf without installing any software. Simply use your browser to get started instantly.

Features

Password protection

Strong encryption

Restrict editing

Restrict printing

Secure processing

How to Use Lock PDF with Password

1Upload PDF
2Set password
3Choose restrictions
4Download protected PDF

Why Use Our Lock PDF with Password?

Fast & Free

Instant results with no signup or payment required.

Secure & Private

All processing happens in your browser. We never store your files.

No Installation

Works on any device with a web browser. No software needed.

Frequently Asked Questions

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