PDF PremProtect PDF – Add Password to PDF Online Free
Lock your PDF with a password in seconds. Upload any PDF, choose a password, set printing and copying permissions, and download an encrypted file — secured with 128-bit AES, free, private, and processed entirely in your browser.
Drag & drop your PDF here or browse files
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128-bit AES encryption. Your password never leaves your device — a forgotten password cannot be recovered.
How to password-protect a PDF
- Upload your PDF — drag and drop it or click the upload area.
- Choose a password, confirm it, and set printing / copying permissions.
- Click Protect PDF and download your encrypted file instantly.
Frequently asked questions
How do I password-protect a PDF online for free?
Upload your PDF, type a password (and confirm it), optionally set printing and copying permissions, then click Protect PDF. Your password-locked PDF downloads instantly. It is free, needs no sign-up and adds no watermark.
What encryption does this tool use?
Your PDF is protected with 128-bit AES encryption (PDF 1.7 standard) — the same encryption level used by Adobe Acrobat. It is strong protection for everyday documents. No encryption is unbreakable, so use a strong password and keep it safe.
Is my PDF uploaded to a server?
No. Everything runs inside your browser — your PDF and your password never leave your device.
Will the protected PDF look the same as the original?
Yes — pages keep the same layout and visual quality. Note: pages are saved as high-quality images inside the protected file, so text cannot be selected or copied from it (unless you allow copying in the permissions).
Can I allow printing or copying for others?
Yes. Use the permission checkboxes before protecting: you can allow or block printing and text copying. PDF readers enforce these permissions when someone opens the file with your password.
I forgot my password — can you recover it?
No. Your password is used only inside your browser to lock the file and is never sent to us or stored anywhere, so a forgotten password cannot be recovered. Keep a safe copy of it.