Question 1

How do I add a password to a PDF?

Accepted Answer

Upload the PDF, type the password readers will need to open it (the user password), and click protect. The tool encrypts the file with AES-256, the same standard used by Adobe Acrobat, using the QPDF engine compiled to run in your browser. Optionally set a different owner password and restrict printing, copying or modifying; anyone opening the file then needs the password before they can even see the first page.

Question 2

What is the difference between a user password and an owner password?

Accepted Answer

The user password controls opening the document: without it, the file cannot be read at all. The owner password controls the permission settings, such as whether printing or text copying is allowed. A reader who opens the file with the user password gets the restricted experience; someone with the owner password can change the restrictions. If you leave the owner password blank, your user password serves as both, which is fine for most personal use.

Question 3

How do I remove a password from a PDF?

Accepted Answer

Use the unlock mode: upload the protected PDF, enter its current password, and the tool decrypts it and gives you a normal unprotected copy. You must know the password. This is the legitimate use case, your own files, files your team protected, documents sent to you with the password, not a way to break into files you have no right to open.

Question 4

I forgot the password to my PDF. Can this tool recover it?

Accepted Answer

No. AES-256 encryption cannot be reversed or bypassed by this or any honest tool, and password-guessing attacks are not something this tool does. If you have forgotten the password, your options are the original unprotected source document, a copy in your email or cloud storage, or asking whoever protected the file. Treat this as a reminder to store important document passwords in a password manager.

Question 5

How strong is the protection?

Accepted Answer

The encryption itself is AES-256, the strongest standard PDF supports, applied by QPDF, a respected open-source PDF engine also used in professional workflows. Real-world strength still depends on the password: a long, unique passphrase is vastly stronger than a short word, because attackers attack the password, not the cipher. Use at least 12 characters mixing words, numbers and symbols for anything sensitive.

Question 6

Is it safe to protect confidential files here?

Accepted Answer

Yes. Unusually for a password tool, nothing is uploaded: the QPDF engine runs as WebAssembly inside your browser tab, and your file and your password never leave your device. That design matters, because sending a confidential file plus its password to a stranger's server would defeat the purpose of protecting it.

PDF Password Protect & Unlock

Use PDF Password Protect & Unlock

How to use the PDF Password Protect & Unlock

Pick protect or unlock

Add the file and password

Set permissions (optional)

Download and test

About the PDF Password Protect & Unlock