To change or remove the password on a Microsoft Power Point document, return to the File menu, select Passwords, and then change or remove the password. Password protect a PDF document All of the macOS applications–Pages, Numbers, and Keynote–allow export to PDF. As we go through the entries, the specs for the new password protected DMG disk image are following: Save As sets the file name of the image file, e.g. My private data.dmg. Where sets the location of the image file. Volume name sets the name of the volume as it would appear in Finder later; Volume size sets the estimated size of the DMG file. Running these files inside the drives may produce some erroneous results. Double clicking the DMG File will open the file and you can view the contents in it. Oct 30, 2012 I think by default DMG passwords use 128-bit AES encryption so it could be a bit of a task using brute force if your password is complex.

You may have sensitive files like documents, images, videos, voice notes, that you want to keep private from friends and family (if they ever happen to use your Mac). Thankfully, it is effortless to put a password on a folder to shield it from others. So, without further ado, let’s get to the steps and show you how to encrypt and password protect a folder on your Mac.

How Do I Password Protect a Folder on Mac?

Open Disk Utility. For this, open Finder → Applications → Utilities → Disk Utility. Or, press Command + Spacebar to open Spotlight Search and type this app’s name.
From the top menu bar, click on File → New Image → Image from Folder.
Now, select the desired folder you wish to lock and click on Choose.
Optional: For ‘Save As:’ continue with the same name, or you may also change it. Click on ‘Where:’ and choose the desired location to save the disk image. You can move it later as well.
Important: For ‘Encryption:’ choose 128-bit AES encryption (recommended). The second option here (256-bit) is slower. Please enter the desired password, re-enter it to verify, and finally click on Choose.
Important: Click on ‘Image Format:’ and choose read/write.
Finally, click on Save.

You have successfully created a disk image (.dmg file) that is protected with a password. Now, let me show you how to use it.

How to View and Re-Lock the Password Protected Folder on Mac

Locate the .dmg disk file.
Double click to open it.
You will be asked to enter the password. Type the same password you used while creating the disk image and click OK. (Note: Do not check the box for ‘Remember password in my keychain.’ If you do, it may defeat the purpose. The saved password will fill in automatically if someone has your Mac or knows its password.)
After you enter the password, you will see a disk image on the desktop. It looks similar to an external pen drive. Double click to open it, and you will see the contents in it.
Important: Now, delete the original folder so that the content inside it is removed from your Mac and is only available inside this password-protected disk image.
To re-lock the protected folder, right-click and choose Eject “Folder Name.”
To reopen it, follow the same process from step 1.

Notes:

This disk image will have almost the same capacity as the size of the original folder. You can freely delete existing content inside it and replace it with other content.
Do not delete this .dmg file. If you do, everything will be lost.
If you want to permanently remove the locked folder (and its contents), open Disk Utility, → choose the disk image from the left sidebar, → right-click on it, and choose ‘Delete APFS Volume.’

Signing Off

This is how you can quickly, safely, and freely lock a folder with a password on Mac. I hope this guide was helpful, and you learned something new.

You can also use third-party apps like Encrypto to encrypt and put a password on individual files and folders.

Want to know more? See how to password protect PDFs and lock notes on Mac.

Finally, here’s an additional tip for you. If you do not want the folder to show up in Spotlight Search, add .noindex after the folder name.

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I have been an Apple user for over seven years now. At iGeeksBlog, I love creating how-tos and troubleshooting guides that help people do more with their iPhone, iPad, Mac, AirPods, and Apple Watch. In my free time, I like to watch stand up comedy videos, tech documentaries, news debates, and political speeches.

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If you already know what the DMG and PKG files are, you can skip to the second paragraph. For those who are learning about this type of file, we will describe its purpose below.

What is a DMG file

If you want to install a third-party application from the internet, you need to download its installer file with a .dmg or a .pkg extension. Both types of files, DMG (Apple Disk Image) and PKG (package installer), are only used on macOS. In most cases, once you download and open a DMG or a PKG file, you are asked to transfer its app to the Applications folder. Then you can launch the program and happily use it.

Since .app files of programs are located in the Applications folder, you can delete DMG files and package installers. Besides that, developers regularly update apps, so if you want to use an updated version of particular software, you will need to download a new installer. Since there is no need to keep useless installers on your Mac, you can remove them using Cleaner-App.

How to delete installer packages on a Mac

How To Remove Password From Dmg Files

To remove unneeded installation files from your Mac using Cleaner-App, complete the next steps:

Launch Cleaner-App.
Select the Installer Packages section.
Skim all the DMG and PKG files. Select some of them or click Select All to get rid of unneeded files at once. Click Review and Remove.
Review the items you want to delete and click to Remove.
Complete the deletion of package installers by emptying the Bin.

Dmg File Format

Cleaner-App is an intuitive software tool that helps you to easily clean up your Mac. It serves not only to remove installers, but also to clear your Downloads. Using Cleaner-App, you can detect duplicate files, same name files, and photo series on your Mac. Then you can conveniently compare these files and select the useless ones for removal. If you want to keep your Mac clean of unwanted files and improve its performance, use Cleaner-App regularly.