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Protect PDF
Encrypt and secure your PDF documents with custom passwords entirely in your browser.
100% Secure Local Encryption
Select PDF document
Drag & drop or select a PDF file to encrypt
Document Selected
document.pdf (0 KB) - Ready to lock
Offline Cryptographic Sandbox Active
Your document is loaded in local browser RAM. Only you can see it.
Security Parameters
Encrypting document...
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Frequently Asked Questions
Quick direct-answer guides about using this utility tool locally and securely.
How does Protect PDF work locally?
We use standard client-side PDF encryption algorithms to secure your file in-memory using the provided password. Your files and passwords are never transmitted over the network.
What is the difference between a user password and an owner password?
A User Password is required to open and read the PDF. An Owner Password is required to change permissions, such as allowing or restricting copying text, editing, or printing.
Will password protection work on all PDF viewers?
Yes, our encryption complies with the standard PDF specifications, meaning it will prompt for a password in Adobe Acrobat, Google Chrome, Apple Preview, and other compliant readers.
What happens if I forget my PDF password?
There is no recovery — since your file and password are never sent to any server, no one (including us) can retrieve or reset a forgotten password. Always save your password in a trusted password manager before closing the tool.
What encryption standard is used to protect my PDF?
Standard PDF encryption uses AES 128-bit or 256-bit encryption — the same level of security used by banks — making it virtually impossible to crack the password using a regular computer.
What makes a strong password for a protected PDF?
Use at least 8-12 characters combining uppercase and lowercase letters, numbers, and symbols, and avoid dictionary words or personal information like birthdates — the longer and more random the password, the harder it is to crack.
Can I remove the password from a PDF later if I need to?
Yes, use a PDF unlock tool along with the correct password to remove protection whenever you no longer need it restricted.
Does password-protecting a PDF prevent copying and printing too?
Yes, if you set an owner/permissions password, you can specifically restrict actions like copying text, printing, or editing — even for users who have the password to open and view the file.
Does this PDF protection tool work on mobile devices?
Yes, since encryption happens entirely in your browser, you can password-protect PDFs on any device — Android, iPhone, tablet, or desktop — without installing an app.