Lock PDF with Password Free

Add AES-256 password protection to any PDF free online. Set open password, restrict printing, copying, and editing.

How to use the Lock PDF with Password Free

  1. Upload your PDF: Go to fixflowhub.com/lock-pdf and drag-drop your PDF file or click to browse.
  2. Set a strong password: Enter a password and confirm it. Use the password strength meter to ensure it is strong enough.
  3. Set permissions (optional): Optionally restrict printing, copying, or editing using the permission checkboxes.
  4. Download protected PDF: Click Lock PDF to encrypt with AES-256 and download your password-protected file.

Frequently Asked Questions

How do I password protect a PDF for free?

Upload your PDF to FixFlowHub, enter a strong password and confirm it, then click Lock PDF. Your encrypted, password-protected PDF downloads instantly — free, no signup required, no software to install.

What encryption does FixFlowHub use to lock PDFs?

FixFlowHub uses AES-256 encryption (PDF 1.7 standard) — the same level used by banks and governments worldwide. It is the strongest encryption available for PDF files and is accepted by all major PDF readers.

Can I restrict printing and copying as well as setting a password?

Yes. When locking your PDF you can set permission restrictions to block printing, copying text, and editing — ideal for sensitive contracts, reports, or documents shared externally with third parties.

Will the password be required every time the file is opened?

Yes. Once locked, the PDF will prompt for the password every time it is opened in any PDF reader, including Adobe Acrobat, Preview, browser-based viewers, and mobile PDF apps.

Is it safe to lock my PDF at FixFlowHub?

100% safe. The AES-256 encryption happens entirely in your browser. Your file and your password are never sent to any server — FixFlowHub cannot see either at any point during or after processing.

Can I remove the password from my PDF later?

Yes. Use the Unlock PDF tool at fixflowhub.com/unlock-pdf to remove the password protection if you know the correct password. Store your password safely as it cannot be recovered if forgotten.

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