Protect PDF with Password

Secure your sensitive documents by adding real AES-256 encryption — verified locally before you download.

🔒 Select PDF to Lock

Max file size 25MB. Your file never leaves your browser.

⚠️ This PDF already appears to be password protected or encrypted. You'll need to remove its existing protection (with the correct password) before a new one can be applied.

Step 1: Set Security Credentials

Don't require a password to open — just restrict permissions (needs an owner password below)

Choose a Password

Confirm Password

Enter a password

At least 8 characters
Upper & lowercase letters
At least one number
At least one symbol

Use this password anyway (not recommended)

Step 2: Permissions

Allow Printing Allow Copying / Extraction Allow Modifying Allow Annotations

Allow Filling Forms / Signing Allow Accessibility Extraction Allow Document Assembly Allow High-Quality Printing

Use a separate owner/permissions password

Owner Password

Encryption Algorithm

RC4 is a legacy, cryptographically weak cipher kept only for compatibility with very old PDF readers. Prefer AES-256 unless you specifically need RC4.

Output File Name

🛡️

Your PDF is now protected and encrypted!

✔ Verified locally: the output file was re-opened with pdf.js to confirm the password actually works before this download was offered.