Password Protect PDF

No file size limits, no ad watermarks - A simple and secure web app to encrypt your PDF files with strong AES 128-bit encryption for free.

Reliable PDF Password Protection

Prevent unauthorized access to your file’s contents through encrypted password protection. The best method for sharing sensitive content with others securely.

No Data Retention

Smallpdf doesn't save any passwords and files are deleted permanently after one hour. All data transfers are handles through TLS encryption to ensure the safety of your data.

On Mac, Windows, and Linux

As a web application, Smallpdf can be accessed using a Mac, Windows, or Linux machine, or even a mobile device. Just open your browser to protect your PDF!

Secure Encryption for Maximum Safety

Some PDF passwords can be hacked easily. With our AES 128-bit encryption, it would take thousands of years to crack your password with a regular computer.

Password Strength for Added Security

The more complex your password, the safer your file. We recommend using a non-dictionary word of at least 7 characters with numbers, capital letters, and symbols.

Password-Protection in the Cloud

To use Smallpdf, you don't need any software. You can encrypt your PDF with a password by simply uploading it, choosing a password, and then downloading the result.

How To Password-Protect a PDF Document:

  1. Import or drag & drop your file to our Protect PDF tool.
  2. Type and confirm the password you’d like to use.
  3. Click “Protect” to add the password to your PDF.
  4. Edit the PDF with our other tools if desired.
  5. Download your protected PDF when ready—done!

Protect PDF Blog Articles

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How To Protect PDF How to Lock a PDF From Editing or Copying | Smallpdf The quickest way to lock and protect the content of your PDF document from editing or copying.

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How To Protect PDF How To Secure a PDF File for Free Securing a PDF with strong password protection has never been so easy, or cheap!

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How To Protect PDF How To Password Protect a Word Document Use the Smallpdf encryption tool to protect your Word Documents with unbreakable passwords.

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How To Protect PDF How To Password Protect a PDF A smart and simple solution for when you need to password lock your PDF files.

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How To Protect PDF How to Encrypt a PDF Online for Free

You can use the Smallpdf Protect PDF tool to encrypt your PDFs with unbreakable passwords online—for free.

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How To Protect PDF How to Create a Strong Password the Old-School Way

Creating a strong, secured and memorable password is not difficult. Follow our guide to do so at the snap of a finger.