PDF encryption

Add a password to your PDF document

Completely free on-line No restrictions
Select File
... or drag and drop files here
How to encrypt your PDF file

How to encrypt your PDF file

Just 5 simple steps to encrypt one or more pages in your PDF file!

  1. Click the Select File button or drag the file to the box above to upload the PDF file
  2. Enter your PDF password
  3. Click the encryption button and wait for a few seconds to a few minutes
  4. Wait a few seconds or minutes, click the download button to download the file
  5. Or you can choose our other PDF tools, such as PDF splitting, PDF compression or water printing

Excellent online PDF encryption tool PDF88

  • Completely free PDF encryption

    Completely free

    We provide free PDF encryption, without any hidden fees, without the need for registration, payment, login and other cumbersome operations, direct use!

  • PDF encryption is simple to use

    Easy to use

    PDF encryption can be completed in five simple steps without downloading software

  • The best online PDF encryption platform

    Best PDF encryption online tool

    We use the most advanced PDF encryption algorithm, and the encrypted PDF file is difficult to crack

  • Fast encryption

    Superior performance

    Dozens of megabytes and hundreds of pages of PDF files can be processed in seconds without waiting for a long time

  • PDF encryption is secure


    Our server does not save any of your data. After processing, it will be deleted immediately. You need to upload it again next time

  • Leading technology

    Leading technology

    The industry-leading PDF technology solution has no loss of quality after PDF encryption, rich functions, and more functions are waiting for you to unlock

PDF Encryption FAQ

  • Is your PDF encryption free?

    you 're right! All tools of PDF88, including PDF encryption tools, are free to use.

  • Can encrypted PDF files be cracked

    We have adopted the most advanced PDF encryption algorithm to ensure that PDF encryption is easily cracked, but you must choose a complex password. Simple passwords are easy to be cracked by violence. Please check

  • Is your PDF encryption tool secure?

    PDF88 attaches great importance to the data security of users. Security makes us first consider and focus on safeguarding
    All data transmission channels are encrypted with SSL256, and other people cannot steal the data in them
    After processing, we will delete your files from the server immediately! Instant transfer and use, each PDF processing is a one-time use