Protect PDF Online
Upload your files to process. All operations happen in your browser - your files never leave your device.
Choose Files to Upload
Drag and drop files here or click to browse
Password Protect PDF Document Online with Secure AES Encryption
Protect PDF files online using ILoveCompress. Add password protection, restrict access, and lock editing or copying instantly. Free, fast, and secure.
FROMUnprotected 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
TOPassword-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 Password Protect PDF Document Online with Secure AES Encryption?
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.
Upload Your PDF
Drag and drop your file or use the upload button. Maximum supported size: 50MB.
Set Password & Lock Options
Choose a password and select permissions: allow or restrict printing, copying, and modifications.
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.
Protecting your PDF with a password is simple. Just go to our Protect PDF tool at https://ilovecompress.com/pdf-tools/protect-pdf, choose your PDF file, set a strong password, and apply the protection. Once done, your PDF will be encrypted and only people with the password can open it.
- •Click on 'Choose files' and select your PDF
- •Enter your desired password (use letters, numbers, and symbols for more security)
- •Apply protection and download the secured PDF
For example, if you’re sharing a contract with a client, you can protect it so only they can access it using the password you provide.
You can easily password protect a PDF using our online tool. Simply go to https://ilovecompress.com/pdf-tools/protect-pdf, choose your file, set a password, and download your secured PDF instantly.
To password protect your PDF, follow these steps:
- •Go to the Protect PDF page
- •Choose your PDF file from your device
- •Type in the password you want to set
- •Download the password-protected PDF
It’s quick, safe, and ensures your file stays private.
You can protect your PDF by choosing your file in our Protect PDF tool, adding a strong password, and downloading the protected version. It works on any device, whether you’re using a computer, tablet, or phone.
Securing a PDF with a password ensures that only authorized people can read it. Here’s how:
- •Open https://ilovecompress.com/pdf-tools/protect-pdf
- •Choose your PDF file
- •Set a password (at least 8 characters long for better security)
- •Download your protected PDF
For example, if you’re sending payslips, invoices, or confidential reports, adding a password keeps the data safe.
To password protect a PDF document, simply open our Protect PDF tool, choose the file, enter your password, and download the secured document. This way, no one can open it without the password you’ve set.
If you already know the password, you can unlock your PDF easily. Go to our Unlock PDF tool (https://ilovecompress.com/pdf-tools/unlock-pdf), choose the locked file, enter the correct password, and download the PDF without password protection.
This is useful if you want to stop entering the password again and again on a file you regularly use.
Adding password protection to your PDF is quick and safe:
- •Go to https://ilovecompress.com/pdf-tools/protect-pdf
- •Choose your PDF file
- •Enter the password you want to use
- •Download the password-protected file
Now your PDF can only be opened by someone who has the password.
Visit our Protect PDF tool, choose your PDF, set a strong password, and download the secured version. This keeps your sensitive files like financial statements, contracts, or personal IDs safe from unauthorized access.
Securing a PDF with password is important for privacy. You can do it easily with ILoveCompress:
- •Go to https://ilovecompress.com/pdf-tools/protect-pdf
- •Choose your file from your device
- •Add your desired password
- •Download the locked PDF
Always use strong passwords like 'MyReport2025!' instead of simple ones like '1234'.
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.
Our Tools
Helpful Resources
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