Add a password to keep a document private, or remove one you already know. It all happens inside your browser — no server, no account, no copy of your file or password anywhere else.
or choose a file from your device
It loads directly into the page. The tool checks right away whether the file is protected and what it needs.
A real PDF encryption engine, compiled to run in your browser, adds or removes the protection without redrawing a single page.
Before you get the file, the tool reopens it to confirm the password works. Then it saves like any other download.
A password typed into an upload site has already left your control. Here it never leaves this tab.
Text stays selectable, links keep working and images stay sharp, because the pages are encrypted or decrypted as they are.
Processing happens in your browser's memory, so there is no upload cap and no waiting on a progress bar for a sensitive file.
No. Your file and your password are processed inside this browser tab and are never sent to a server. Only the tool's own code and its encryption engine are downloaded when the page loads.
No. This tool removes a password you can supply; it does not guess or crack passwords, and nobody can recover a strongly encrypted PDF without it. The exception is a PDF that opens freely but blocks printing or copying — that kind needs no password to unlock.
An open password is required to view the file at all. Permissions limit what you can do once it is open, such as printing or copying text. Permissions are advisory and some apps ignore them, so use an open password for real privacy.
AES-256 by default, the strongest standard PDF encryption. AES-128 is available if the recipient uses a very old PDF reader.
No. Pages are not re-rendered, so text stays selectable and images keep their original quality. Only the encryption layer changes.
Any change to a signed PDF, including adding or removing encryption, invalidates its signature. That is how signatures are designed to work, so lock or unlock before signing when you can.
The tool needs to open the file first. Unlock it with its current password, then switch to Protect PDF to set a new one.
Yes, in any modern browser. Large files are limited only by your device's memory, so very big PDFs work better on a computer.
Only unlock files you own or have permission to open. This tool needs the correct password, so it cannot be used to break into someone else's document.