Securing your PDF is simple and fast. Follow these easy steps to encrypt your document and restrict unauthorized access.

Step 1: Upload or drag and drop your PDF file into the secure toolbox.

Step 2: Type a strong "Open Password" to restrict viewing access.

Step 3: (Optional) Set an "Owner Password" to disable printing, editing, or copying.

Step 4: Click the "Lock PDF" button to apply the encryption.

Step 5: Download your safely password-protected PDF file instantly.

Lock PDF - Add Password Protection to PDF Documents Free Online

Looking for a reliable way to secure your sensitive documents? Our free online Lock PDF tool allows you to add strong password protection to your PDF files in just a few clicks. Whether you are handling confidential financial reports, legal contracts, or private personal records, encrypting your PDF ensures that only authorized individuals can access your data. With our advanced 256-bit AES encryption technology, you have complete control. You can set a standard "open password" to restrict document viewing, or apply an "owner password" to prevent unauthorized printing, editing, and text copying.

The best part about our PDF locker is our strict commitment to your privacy. You get enterprise-grade security without the need to download heavy software or sign up for an account. Everything happens quickly and securely within your web browser. We guarantee that your highly confidential files and passwords are never permanently stored or shared on our remote servers; they are automatically deleted shortly after your encrypted file is generated. Protect your intellectual property, maintain data compliance, and keep your digital documents safe from prying eyes effortlessly.