Free PDF Password Protection
Password protect a PDF online free
Encrypt a PDF with a password before sharing sensitive documents. Use the tool below, set a password, then download the protected file.
Browser-based PDF encryption
Open a PDF, set a password, and download a version that requires that password to open.
Your files are handled safely
✔ Processing happens in your browser
✔ Your file is never uploaded to a server
✔ Your files are not stored or saved anywhere
✔ No account or sign-up required
Why Use It
Common reasons people protect PDFs
Sensitive documents
Add a layer of protection before emailing contracts, records, or financial documents.
Shared drives and links
Keep a file private even if the link or storage location is accessed by the wrong person.
Client and HR files
Protect documents that should only be opened by the intended recipient.
How It Works
Simple 3-step workflow
1. Choose your PDF
Choose the PDF file you want to protect.
2. Set a password
Enter and confirm the password required to open the file.
3. Download the protected PDF
Save the encrypted file and share the password separately with the recipient.
Trust & Privacy
Real encryption, not a gimmick
This tool applies standard AES-256 PDF encryption using your browser's built-in Web Crypto API. Because the file and password never leave your device, there is no server-side copy of either one.
FAQ
Password protect PDF questions
What encryption does this use?
The PDF is encrypted with AES-256, the standard PDF encryption method supported by modern PDF readers.
What happens if I forget the password?
There is no way to recover it. Since the file never leaves your browser, we have no copy of your file or password to reset.
Will this work with any PDF reader?
It works with modern PDF readers that support standard PDF password protection, including Adobe Acrobat and most browser PDF viewers.
Is my file uploaded to a server?
No. Encryption runs entirely in your browser using the Web Crypto API. Your PDF is never uploaded to a server, and nothing is stored.