AfroTools / Tools

Password protect a PDF

Add an open password, set viewer permissions, batch export protected PDFs, or unlock a file when you already know the password. Files and passwords stay in this browser.

AES-256 Known-password unlock Batch ZIP
1Choose modeProtect a PDF, or unlock with a known password.
2Set passwordGenerate, confirm, copy, and store it separately.
3DownloadSave a protected PDF or batch ZIP.
Mode Protect or unlock
Upload PDFs to protect PDF only
Choose PDFs to password-protect
Single PDF downloads as a PDF. Multiple PDFs download as a ZIP.
No PDFs selected.
Protection Settings AES-256 standard security
Empty
Optional
Leave blank to generate an internal owner key.
Password Tool
Store the password safely. Lost open passwords cannot be recovered.
Viewer PermissionsCompliant viewers
Protection limits

Protect a copy, then test the password in another reader

Password protection and unlock attempts run locally. This tool does not recover unknown passwords, store passwords, or guarantee that every PDF reader enforces permissions the same way.

Local-first PDF protection

Reviewed 2026. Disclaimer: verify with the recipient and another PDF reader before relying on protection. Direct local downloads do not upload your files.

Methodology

  • Uses local PDF encryption/decryption support to create protected copies or unlock PDFs when the correct password is supplied.
  • Password strength feedback is a local estimate and does not check breach databases.
  • Permission flags can be interpreted differently by PDF readers; encryption strength and compatibility should be tested.

Before sharing

  • Keep the original unprotected file, test the protected output, and share the password through a separate trusted channel.
  • Do not use this as a legal redaction, certified security, password recovery, or compliance workflow.
  • For visible covers, signatures, or page cleanup before protecting, use PDF Workspace.