Protect PDF
Add password protection to your PDF files with military-grade AES-256 encryption. Your file never leaves your browser.
How to Protect a PDF with a Password
Upload your PDF file by dragging and dropping it or clicking the upload area.
Enter a strong password and confirm it. This password will be required to open the PDF.
Optionally configure advanced permissions to restrict printing, copying, or editing.
Click "Protect PDF" and your encrypted file will download automatically.
Why Use Our PDF Protector?
Complete Privacy
Unlike most online tools, your PDF is never uploaded to any server. All encryption happens directly in your browser using the Web Crypto API.
AES-256 Encryption
We use the same encryption standard used by governments, banks, and military organizations. AES-256 is virtually unbreakable with current technology.
Granular Permissions
Control exactly what recipients can do with your PDF. Allow or restrict printing, copying text, modifying content, and adding annotations.
No Registration Required
Start protecting your PDFs immediately. No account, no email, no subscription. Completely free with no limits on file count or size (up to 50 MB).
Frequently Asked Questions
What encryption does this tool use?
We use AES-256 encryption (PDF 2.0 standard), which is the strongest encryption available for PDF files. This is the same standard used by governments and financial institutions worldwide.
Is my PDF uploaded to a server?
No. All encryption happens entirely in your browser using the Web Crypto API. Your PDF file never leaves your device, ensuring complete privacy and security.
Can I set different permissions for the protected PDF?
Yes. You can configure advanced permissions to allow or restrict printing, copying text, modifying content, and adding annotations. These restrictions apply even after the recipient enters the password.
What happens if I forget the password?
Since the encryption happens in your browser and we never store your password, there is no way to recover it. Make sure to save your password in a secure location.
What is the maximum file size?
You can protect PDF files up to 50 MB. Processing time depends on your device since everything runs in your browser.