Encrypting Zip Files

Encrypting a Zip File

Please read about encryption before using this feature.

To encrypt or re-encrypt all of the files in an open WinZip® file (.zip or .zipx):

  1. In the main WinZip window, select all of the files in the WinZip file (Ctrl+A is a handy keyboard shortcut).
  2. Click Encrypt In the Tools tab****.
  3. In the Encrypt dialog, enter the password in the Enter password and Re-enter password (for confirmation) fields and then click OK.

The type of encryption that is used depends on the encryption settings in the Encryption tab of the WinZip Settings dialog.

Any files in the Zip file that are already encrypted must first be decrypted before they are re-encrypted using the method and password you specified. WinZip will first try to decrypt the files using the current encryption password; if a file cannot be decrypted with this password, WinZip will ask you for the correct decryption password. If you are unable to supply the correct password, the file will be skipped, and it will remain unchanged in the Zip file.

Notes

  • It is more efficient to encrypt files while they are being added to the Zip file than to encrypt them after they have been added. In the WinZip ribbon interface, enable the Encrypt button in the Zip tab**** before adding files.
  • You can also perform this action from the Windows File Explorer context menu. Simply right click the Zip file and choose Encrypt from the WinZip context menu.
  • This feature is available only for Zip files.

See also

About Encryption

Using Encryption

Password Policy in your WinZip configuration

How do you encrypt files in a Zip file with WinZip?

WinZip creates Zip files that abide by the specifications as published in the .ZIP Application Note. Encryption is applied to files that are being zipped. This encryption is added after compression and does not affect any other associated data. Data in a Zip file is encrypted byte-for-byte.

WinZip can encrypt files while you create new Zip files (.zip or .zipx) and it can also add encryption to data in existing Zip files.

Encrypt while creating Zip files

WinZip in the Default view:

  1. Click the Encrypt toggle in the Actions pane
  2. If you have not already done so, click the Options button that now displays in the Actions pane to set the encryption level
  3. Add files to your new Zip file
  4. Enter a password when the Encrypt dialog displays
  5. Save the Zip file

WinZip in the Classic view:

  1. Click the Encrypt button in the Create/Share (Edit) tab
  2. If you have not already done so, click Conversion Settings drop down menu on the Settings tab and choose Encryption to set the encryption level
  3. Add files to your new Zip file
  4. Enter a password when the Encrypt dialog displays
  5. Save the Zip file

If you are creating a Zip file in a folder window using the context menu (right click), you will have the option to encrypt the files and select encryption strength if the Add dialog is displayed. If you choose to add files to an existing Zip file using Add to recently used Zip file there will be no Add dialog and therefore no opportunity to encrypt the files while they are being added. In such a case, you can encrypt files after they have been added.

Another option would be to use WinZip Express for Explorer. To do this, click Zip and Share (WinZip Express) when you right click. With WinZip Express you can zip, choose to encrypt, and make use of many additional options such as saving to a cloud service.

Encrypting data in an existing Zip file

In the WinZip user interface:

  • Method 1:
    1. Open the Zip file
    2. Click the Encrypt toggle in the Actions pane, click Options below the toggle when it appears, and click Apply to all files in the Zip
  • Method 2:
    1. Open the Zip file
    2. Click the Tools tab
    3. Click the Encrypt button in the Selected Files section (WinZip 22.0 or later) For recent WinZip versions prior to 22.0, click Selected Files , check the box next to Encrypt files , and click the Convert Selected Files button

In a Windows Explorer folder window:

  1. Right click on the Zip file in a folder window
  2. Choose WinZip
  3. Click Encrypt

In each case, WinZip will ask for a password and then encrypt all files currently in the Zip file. Depending on the method you use, you may or may not have the option to change the encryption strength.

If a file in the Zip file is already encrypted, it will first be decrypted and then re-encrypted using the password and encryption method you specified. WinZip will first try to decrypt the file using the current password; if the file cannot be decrypted with this password, WinZip will ask you for the correct password. If you are unable to supply the correct password, the file can be skipped, and it will remain unchanged in the Zip file. The password you entered in the Encrypt dialog box will remain active until either you delete or replace it, or you close the archive.

If you have any questions about this information, please submit a Technical Support ticket.

Compiled from the official WinZip Knowledge Base (https://kb.winzip.com/)