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Proteger PDFHerramienta Online Gratuita

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By the AllFileBox Team · Last updated: 2026-07-05

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Protect PDF is a free online tool that adds password encryption to a PDF, so only people who know the password can open and read the document.

Why password protect a PDF

Contracts, statements, and personal records often need to stay confidential. Adding a password encrypts the PDF so it cannot be opened without the key, which is essential when sending sensitive files by email or storing them in shared locations.

Strong, standard encryption

The tool applies standard PDF encryption tied to the password you choose. Anyone without the password sees only an encrypted file. Choose a strong, unique password and share it through a separate channel from the document itself.

Cómo Usar Proteger PDF

  1. Open Protect PDF in your browser.
  2. Drop your PDF onto the upload area.
  3. Enter the password you want to set.
  4. Confirm the password.
  5. Download the encrypted PDF.

Secure financial files

Secure financial files

Password protect a bank statement before emailing it to your accountant.

Protect contracts

Encrypt a signed agreement so only the parties can open it.

Lock personal records

Add a password to medical or ID documents stored in the cloud.

Protect PDF essentials
StepWhat it doesNote
Set passwordEncrypts the fileChoose a strong one
Share PDFStays lockedSend key separately
Open laterNeeds passwordUnlock to remove

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