PDF Security
Encrypt, sign, and secure your PDFs.
How to protect your PDF files Online for Free
The PDF Security tool helps you protect your PDF files with User Password and Owner Password security. You can require a password to open the PDF, restrict editing, printing, copying, and other actions, or apply both types of protection for maximum security.
It’s perfect for confidential documents, business reports, contracts, invoices, legal files, and personal records.
Key Benefits
- Protect PDFs with a User Password.
- Set an Owner Password for permissions.
- Prevent unauthorized access.
- Restrict printing, editing, and copying.
- Keep sensitive documents secure.
- Fast browser-based processing.
- Works on desktop and mobile.
- No registration required.
- Free to use.
- Easy for everyone.
User Password
A User Password (also called an Open Password) is required to open and view the PDF.
- Prevent unauthorized access.
- Only people with the password can open the file.
- Ideal for confidential documents.
- Protect sensitive personal or business information.
Owner Password
An Owner Password controls what users can do after opening the PDF.
You can restrict:
- Printing.
- Editing document content.
- Copying text and images.
- Filling forms.
- Adding comments and annotations.
- Page extraction.
- Document assembly.
- Other PDF permissions.
Practical Use Cases
- Protect confidential business files.
- Secure contracts and agreements.
- Lock financial reports.
- Protect legal documents.
- Secure invoices and quotations.
- Share read-only PDFs.
- Prevent unauthorized copying.
- Restrict document editing.
- Protect educational materials.
- Archive sensitive records.
Features
- Add User (Open) Password.
- Add Owner (Permissions) Password.
- Restrict printing.
- Restrict editing.
- Disable copying.
- Control document permissions.
- High-quality PDF output.
- One-click download.
- Browser-based processing.
- No software installation required.
Why Choose This Tool?
- Protect your PDF files in just a few clicks.
- Flexible password and permission controls.
- Maintains the original document quality.
- Simple enough for beginners.
- Works directly in your browser.
- Fast, secure, and reliable.
How to Use This Tool
Drag your file here or click to choose one from your device. It stays local.
Choose your settings or edit your file directly in the workspace container.
Click the process button and save the new file straight to your downloads.
Why Use This Tool?
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100% Private
Your files never leave your device. All processing happens in your browser using WebAssembly technology.
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Instant Processing
Powered by WebAssembly for lightning fast results, with no server wait times or queues.
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Free Forever
No registration, no subscriptions, no hidden costs. Unlimited usage for everyone.
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Works Everywhere
Compatible with Chrome, Firefox, Safari, Edge on desktop and mobile devices.
Frequently Asked Questions
Is PDF Security free to use?
Yes, absolutely! Every single tool here is completely free. There are no limits, no hidden subscription costs, and you don't even have to sign up or share your email address. Just use it as much as you need.
Is it safe to pdf security online?
Yes, it is 100% safe. Most online PDF tools copy your files to their servers, but we don't. We use a browser-based technology called WebAssembly to do all the heavy lifting locally on your own computer. Your files never leave your device.
What file size can I process?
Because the tools process your files directly on your computer, we don't impose any file size limits at all. The only limit is what your computer or phone can handle, meaning you can easily edit files that are 100MB or larger.
Do I need to install any software?
No, you don't need to download or install anything. All you need is a standard web browser (like Chrome, Safari, or Firefox). Just load this page, drag in your file, and you're good to go.