Free PDF Password Protect
Encrypt your PDF with a password using 128-bit RC4 encryption. Set open password, owner password, and permissions. 100% browser-based via pdf-lib.
Advertisement
🔒 PDF Password Protect
✓ Real 128-bit RC4 encryptionFrequently Asked Questions
pdf-lib uses 128-bit RC4 encryption (PDF 1.4 standard). This is widely compatible with all PDF viewers. For AES-256 encryption (PDF 1.7), a server-side tool like Ghostscript is required.
The user password is required to open the document at all. The owner password controls editing permissions — without it, users cannot change security settings, even if they can open the file.
No. The tool doesn't store your password anywhere — it's processed entirely in your browser. There is no recovery mechanism. Write down your password before encrypting.