PDF Password Protect
Add password protection to your PDF files for secure sharing and storage.
Drop your PDF here
or click to browse files
PDF Security Features
Understanding PDF encryption and password protection.
Security Options
Restrict PDF access with a user password that must be entered to open the file.
Industry-standard AES-256 encryption is the strongest available for PDF files.
Server-side encryption is required for proper PDF password protection.
Information
Use at least 12 characters mixing letters, numbers, and symbols for maximum security.
Protected PDFs work with all standard PDF readers including Acrobat and Preview.
Owner passwords allow control over printing, copying, and editing permissions.
About PDF Password Protection
PDF password protection uses encryption to restrict access to your documents. True PDF encryption requires server-side processing to implement correctly according to the PDF specification.
Frequently Asked Questions
Why does PDF encryption require server processing?
The PDF specification defines a specific binary encryption structure that must be applied to the file.
Proper AES-256 encryption of the PDF data streams requires low-level access to the PDF format.
This cannot be done securely and correctly in a browser-only environment.
What is the difference between user and owner passwords?
The user password (also called the open password) is required to open and view the PDF.
The owner password controls document permissions such as printing, copying, and editing.
You can set either or both passwords depending on your security needs.
How strong is PDF AES-256 encryption?
AES-256 is the strongest encryption standard available for PDFs.
It is considered unbreakable by brute force with a strong password.
Older PDF encryption using RC4 is weaker and should be avoided.
What makes a strong PDF password?
Use at least 12 characters combining uppercase and lowercase letters.
Include numbers and special characters such as symbols and punctuation.
Avoid dictionary words, names, or predictable patterns.
Can I remove a password from my own PDF?
Yes, if you know the password you can open the PDF and re-save it without protection.
Most PDF readers including Adobe Acrobat allow saving without a password.
You need the correct password to remove protection.
Do protected PDFs work in all readers?
Yes, standard PDF encryption is supported by all major PDF readers.
Recipients will be prompted to enter the password when opening the file.
Adobe Acrobat, Apple Preview, and browser PDF viewers all support password-protected PDFs.
When will server-side protection be available?
Server-side PDF encryption is planned for a future release.
It will allow proper AES-256 encryption of PDF files.
Check back for updates on when this feature launches.
Is there a way to protect a PDF now?
Yes, you can use Adobe Acrobat, LibreOffice, or other PDF editors.
macOS Preview also supports adding password protection to PDFs.
These desktop tools provide full AES-256 encryption support.