Protect PDF Online

Upload your files to process. All operations happen in your browser - your files never leave your device.

Drag and drop files here or click to browse

Accept pdf, x-pdf, acrobat, applications/vnd.pdf, text/pdf, vnd.adobe.pdfxml, .pdf files up to 50 MB

Maximum 1 files

Protect PDF Online - Add Password Protection to PDF Files

Protect PDF files online using ILoveCompress. Add password protection, restrict access, and lock editing or copying instantly. Free, fast, and secure.

FROM
Unprotected PDF Document

PDFs with no password or permission settings. Anyone can open, edit, print, and copy content without restrictions.

  • No password required
  • Unrestricted editing
  • Copy and paste allowed
  • Printable by anyone
  • No encryption or protection applied

TO
Password-Protected PDF

A locked PDF file with password access and restricted permissions like editing, printing, and copying, using AES encryption.

  • Password required to open
  • Control who can print or copy
  • Block unauthorized edits
  • AES 128/256-bit encryption
  • Set owner/user level permissions

Why Use Our Protect PDF Online - Add Password Protection to PDF Files?

Discover the key advantages of converting your files with our professional-grade tool.

Password Protect PDF Easily

Protect PDF files with passwords to prevent unauthorized access. Simple, quick, and effective.

Secure File Handling

All protection happens inside your browser. Your PDFs and passwords stay private and never leave your device.

Instant PDF Security

Lock your PDF in seconds—no delays, no uploads, just fast results with one click.

Business-Grade Protection

Ideal for securing contracts, reports, or client documents from unauthorized use or leaks.

Customizable Restrictions

Set who can view, print, copy, or edit the PDF. Full permission control at your fingertips.

Free and Unlimited

Protect unlimited PDF files for free. No sign-up, no limits, no watermarks.

How to Convert Files Online - Step by Step Guide

Follow this comprehensive guide to convert your files quickly and efficiently. Our tool provides a seamless experience similar to other Unlock PDF available on our platform.

1

Upload Your PDF

Drag and drop your file or use the upload button. Maximum supported size: 50MB.

2

Set Password & Lock Options

Choose a password and select permissions: allow or restrict printing, copying, and modifications.

3

Download Locked PDF

Click download to get your protected PDF with all security settings applied.

Key Features & Capabilities

Explore the powerful features that make our converter the best choice for your needs. These features are designed based on industry standards and user feedback.

User & Owner Passwords

Assign both types of passwords: one to open the PDF and another to control usage rights.

Granular Permission Settings

Decide who can print, copy, annotate, or modify your PDF with fine-grained control.

Original Quality Retained

Your PDF stays pixel-perfect. Locking it won't change fonts, layouts, or images.

Local PDF Protection

Everything runs in-browser. No file gets uploaded. Your content remains on your device.

Handles Large PDFs

Supports files up to 50MB. Great for contracts, manuals, and multi-page reports.

Works Everywhere

Your protected PDF will open on any device or browser with standard PDF readers.

Frequently Asked Questions

Get answers to common questions about file conversion and our tool. For more technical information, you can also refer to PDF Security - Wikipedia.

Is it safe to use this PDF protection tool?

Yes. All processing is done locally in your browser. Your file never leaves your system.

How do I password protect a PDF for free?

Upload your PDF, set a password, and download the locked file instantly. No account needed.

Can I lock a PDF to prevent editing or copying?

Yes. Use owner password permissions to block editing, printing, and copying.

What encryption is used to protect PDFs?

We use industry-standard AES encryption—128-bit or 256-bit based on your settings.

Can I protect large files?

Yes, the tool supports PDFs up to 50MB in size.

Do I need to install software?

No. This tool works 100% online and doesn't require downloads or installation.

Technical Specifications

Detailed technical information about supported formats and capabilities. These specifications are based on official documentation from PDF Security - Wikipedia.

Supported Inputs

  • Standard PDF files
  • Multi-page PDFs
  • PDFs with embedded media
  • Text or image-based PDFs

Encryption Levels

  • AES 128-bit
  • AES 256-bit
  • RC4 compatibility
  • Standard PDF 2.0 security support

Output File Features

  • Password protected PDF
  • Permission control enabled
  • Original content unchanged
  • Cross-device compatibility

Device Compatibility

  • Chrome, Safari, Firefox, Edge
  • Windows, macOS, Linux, Android, iOS
  • Desktop, tablet, and mobile
  • No software installation needed

Additional Resources

Explore more tools and helpful resources for your file processing needs.

Start Protecting PDFs Now

Join thousands of users who trust our free, secure, and lightning-fast PDF protection tool. Secure your documents with confidence - no registration required!