Protect PDF with Password
Easily add a password and encrypt your PDF files for free online. Our tool uses powerful AES-256 encryption and works entirely in your browser to keep your files secure.
How It Works
Upload Your PDF
Select your PDF file by clicking the upload area or dragging and dropping it.
Set a Secure Password
Enter a strong password in the input field that will be required to open the document.
Protect Your File
Click the 'Protect PDF' button. The tool will securely encrypt your file in your browser.
Download the Secure PDF
Your new, password-protected PDF will be ready for download instantly.
Drop your PDF here
or click to browse
Processing...
This may take a moment for large files.
Your PDF is Protected!
Anyone trying to open the file will now need the password.
Key Features
Client-Side Security
Your files are never sent over the internet. Encryption happens entirely on your computer.
AES-256 Encryption
We use the industry-standard for strong encryption to ensure your document is secure.
Preserves Document Quality
Unlike other methods, our tool keeps your text selectable, links clickable, and quality identical.
Easy to Use
A simple, intuitive interface makes protecting your sensitive documents effortless.
No Registration
Protect your PDFs instantly without the need for an account or subscription.
Secure Your PDFs with Unbreakable Password Protection
Protect your sensitive PDF documents by adding a password for free. Our online tool makes it simple to encrypt your files, preventing unauthorized access and ensuring your information remains confidential. Perfect for contracts, reports, and personal documents.
Professional-Grade Security, Ultimate Privacy
Other online tools may upload your sensitive documents to their servers to add a password. We believe in absolute privacy. Our tool uses a powerful, browser-based security engine to encrypt your files locally. This means you get the benefit of strong, reliable password protection without your data ever leaving your machine.
Frequently Asked Questions
Is this PDF protection tool really free?
Yes, it is 100% free to use with no limitations. You can protect as many files as you need.
Is my file data secure?
Absolutely. Your file is never uploaded to any server. All encryption happens locally in your browser, ensuring your data remains completely private and under your control.
What kind of encryption is used?
We use AES-256, one of the strongest and most widely used encryption standards, to protect your PDF files. This is the same level of security often used by banks and governments.
Will adding a password reduce the quality of my PDF?
No. Our tool only adds a layer of security. The original quality of your text, images, links, and formatting is perfectly preserved.
Why does it sometimes take a moment for the encryption to start?
To provide the highest level of security directly in your browser, our tool loads a powerful, self-contained security engine (via WebAssembly). This may take a few seconds to initialize the very first time you use it on a page. This ensures maximum security without ever needing a server.