Add password protection to your PDF files online for free. Secure sensitive documents before sharing.
Set an owner password to restrict printing, copying, or editing of your PDF. Set a user password to require a password to open the document.
Perfect for protecting contracts, medical records, financial documents, and any sensitive information. The encryption uses 128-bit AES for strong security.
Select or drag the PDF you want to protect.
Enter your desired password and choose what permissions to restrict.
Download your password-protected PDF ready to share securely.
Your files never leave your device. Everything runs directly in your browser using JavaScript — no server, no cloud, no data collection. Your documents stay private.
We use 128-bit AES encryption, which is the industry standard for PDF security.
Yes, you can set a user password (to open) and an owner password (to restrict editing).
No. If you lose the password, you cannot access the protected PDF. Store it safely.
Yes, password protection is a standard PDF feature supported by all major PDF readers.
Yes — PDFInOne is a completely free alternative to iLovePDF, Smallpdf, PDF24, and Adobe Acrobat online. Unlike those services, PDFInOne processes everything locally in your browser: no file uploads, no account required, no file size limits, and no watermarks.