Add real password encryption to a PDF file, right in your browser. Set a user password (and optional owner password), then download the protected file.
Max 20MB
This tool uses RC4 128-bit encryption, a standard PDF security method supported by virtually all PDF readers, applied entirely in your browser.
Yes. You can optionally set a separate owner password in addition to the user password required to open the document.
No, encryption happens entirely in your browser using JavaScript. Your PDF and password are never sent to any server.
There is no recovery option — keep your password saved somewhere safe, since a forgotten password will make the PDF permanently inaccessible.
This tool encrypts a PDF file with a real password, using RC4 128-bit encryption applied entirely in your browser via open-source encryption libraries. Once protected, the PDF will require the password to open in any standard PDF reader — Adobe Acrobat, browser PDF viewers, and most other software.
PDF encryption supports two distinct password roles. The user password is required simply to open and view the document — without it, the PDF cannot be read at all. The owner password is a separate, optional password that governs permissions like printing, copying, or editing; a PDF reader that already has the user password can typically open the document regardless of the owner password. If you leave the owner password blank, this tool uses the user password for both roles, which is the most common setup for simple "keep this document private" use cases.
Keep in mind that PDF password protection, while a real and useful security layer, is not unbreakable — it protects against casual, unauthorized access rather than determined, resourced attackers. For highly sensitive data, additional security measures beyond PDF password protection are recommended.
This tool uses an open-source RC4 128-bit PDF encryption library running entirely in your browser via JavaScript. When you provide a password, the tool encrypts the PDF's content streams according to the standard PDF encryption specification, producing a new file that any compliant PDF reader will recognize as password-protected and prompt for the password before opening.
Your PDF file and the password you set are processed entirely in your browser — nothing is uploaded to, or stored on, any server. This is especially important for a password-protection tool, since sending an unprotected document (or its password) to a third-party server would defeat the purpose of protecting it in the first place.