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You can now Password Protect PDF using Adobe Acrobat Reader mobile app.

Adobe Employee ,
Oct 14, 2020 Oct 14, 2020

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Adobe Acrobat Reader mobile app allows you to protect your PDF file with password. Subscribers to Adobe Acrobat Premium or Adobe Acrobat Pro DC can password protect PDFs by setting a document open password.


Note: Only document open password can be setup using mobile app. For permission password, you would be required Acrobat DC desktop application.


Things to keep in mind, when creating password for a PDF:

  • The app creates a file copy named “<the file name>_protected” and saves that file to the Document Cloud. It does not protect or change the original file.
  • Actions which change the file are blocked on mobile devices, including Fill & Sign, commenting, and editing.
  • You can use the restricted features with desktop Acrobat.
  • You can remove the password with desktop Acrobat (you must know the original password).
  • There is no separate password for edit. If a user can open a file, they can edit the file.


To password protect a file from within an open PDF or from any file list:

  1. Tap pic 1.pngfor iOS and pic2.pngfor Android

  2. Tap pic3.png





3. Enter a password and confirm it. Use only supported characters.

4. Tap Set Password.







Supported characters:

When you create a password to password-protect a PDF, you must only use letters, numbers, and the supported characters listed below. Passwords with unsupported characters show an error dialog.


Supported characters: !, “, #, $, %, &, ‘, (, ), *, +, ,, -, ., /, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, :, ;, < , =, > , ?, @, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, [, \, ], ^, _, `, a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, {, |, }, ~


Opening a protected file:

To open a password protected file, you must know the password.


Note: Keep your password saved somewhere. There is no way to retrieve a forgotten password.


  1. Open a protected file.
  2. Enter the password.
  3. Tap OK.






Additional Info:

To change or remove the password for an existing protected PDF, you would be required Acrobat DC desktop application. You can change/remove password security, only when these conditions are met:  https://community.adobe.com/t5/acrobat/how-to-mange-your-document-passwords-with-acrobat-dc/td-p/110...


Have further questions? Join the conversation here. We are listening!

To discover a host of other great features – Go straight to:  Want to make simple edits of PDF on iPad/Tablets? We’re here to help!  | Work with PDF forms on Acrobat Reader Mobile & You can do more in Adobe Reader Mobile if you have an Acrobat Pro DC subscription.

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