Encrypt and password-protect your PDF documents. Set user and owner passwords, control printing, copying, and editing permissions with 128-bit AES encryption.
Set a password on your PDF so it cannot be opened without the correct credentials. The tool encrypts your document entirely in your browser, so the file and password never leave your device. You can set a user password (required to open the file) and, optionally, a separate owner password. A password strength meter and a one-click strong-password generator help you pick something hard to guess.
Initializing in your browser…
Add text watermarks to protect your PDFs
Add your signature to PDF documents. Draw, type, or upload your signature, then position it anywhere on the page. Perfect for contracts, agreements, and official documents.
Combine multiple PDF files into one document
A payslip PDF must be encrypted with a password before emailing it.
Input
payslip.pdf + open password · 128-bit AES
Output
payslip.pdf, encrypted; opening it now requires the password
The PDF is encrypted with 128-bit AES so its contents are unreadable without the password, and you can also set a separate permissions password to restrict printing or copying. Encryption happens in the browser, so the sensitive document is never uploaded.
Set a password on your PDF so it cannot be opened without the correct credentials. The tool encrypts your document entirely in your browser, so the file and password never leave your device. You can set a user password (required to open the file) and, optionally, a separate owner password. A password strength meter and a one-click strong-password generator help you pick something hard to guess.
Protect financial reports, contracts, or strategic plans before sending them over email.
Require a password before proposals or design files delivered to clients can be opened.
Add a password to tax returns, medical records, or other sensitive personal documents stored in the cloud.
Require a password before anyone can open published or distributed materials.
Encryption is performed client-side using the pdf-encrypt-lite library, which implements RC4 128-bit PDF encryption (the PDF Standard Security Handler). The PDF is first loaded and saved with pdf-lib, then encrypted with your user password and an owner password (the user password is reused as the owner password if you do not set a separate one). The resulting file prompts for the password in standard PDF readers.
A note on permissions: the interface lets you toggle permissions such as printing, copying, and editing, but the current encryption step applies the open password protection rather than enforcing those individual permission flags in the output, so treat them as intended settings rather than guaranteed restrictions. RC4 128-bit is older than modern AES-256 encryption; it keeps casual readers out and is widely compatible, but for highly sensitive material you may want stronger, dedicated encryption.
The user password is required to open the document. You can also set a separate owner password; if you leave it blank, the user password is used for both. In this tool both are about controlling access via encryption rather than enforcing fine-grained print/edit permissions.
This tool adds password protection rather than removing it. To take a password off, you would need a separate unlock tool and knowledge of the current password.
It uses RC4 128-bit PDF encryption, which is widely compatible and keeps casual readers out. It is older than AES-256, so for highly sensitive documents consider stronger, dedicated encryption or secure file transfer.
PDF parsing and editing happen in your browser. Documents, and everything inside them, are never uploaded or stored remotely.