Secure Folders is a free app that offers multiple types of protection for your files. It runs well and provides a nice array of features that are very accessible to users of all experience levels.

1. Hold 'Control' and click the file or folder you plan to password protect. This is Apple's equivalent to.
2. From the menu, select “New Image” “Image from Folder.” and choose the folder you want to encrypt. Enter a name, tags (optional), and select where to save the disk image. Choose an encryption level of 128-bit or 256-bit. Click “Save” and then enter a secure password.
3. Keeping the original unprotected folder at hand isn’t such a hot idea as it’s accessible to anyone who uses your Mac when it’s logged into your account, so trash it or archive it somewhere safe.

This articles explains how you can password protect your folders and files on your Mac. You can assign passwords for files and folders. Everyone must enter to open the file or folder because the contents of your locked files or folders will be hidden.

Important note: Although password protecting requires different steps for different file and folder types, it is common for most of them the that there’s no way to recover your password if you forget it.

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This article has two parts: (1) how to lock a folder (2) how to lock a file

See also: Slow iCloud Keychain?

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1. Password Protect Folders

Secure Folder For Mac Folder

By following the steps below, you will create a password protected disk image (DMG) folder on a Mac. If you want to password protect files certain files like images etc, you may place them in password protected folders.

In this tutorial, we are password protecting a folder called macReports.

1. Open Disk Utility (Applications / Utilities / Disk Utility).

2. In Disk Utility, go to File > New Image > Image from Folder…

3. Now, select the folder you want to password protect. In our example, it is the macReports folder, and click Choose

4. You can save this new folder as anything you want. Select where you want to save this folder. You can name it anything you wish. Encryption, select “128-bit AES Encryption (Recommended)” and image format, select “read/write”. When you select the encryption, you will be asked to enter a password. Enter your desired password and click Choose.

5. And after that, click Save. Disk Utility will say ” Creating folder disk image “macReports.dmg”. It may take several seconds, when it is completed, click Done. Now, you may wan to delete the original folder.

2. Password Protect Files

You can also password protect individual files, if you prefer. But the process is different for different file types. here is how:

Password Protect your Notes

See also: How to create text files

Please note that the Notes app uses a one (single) password to lock all notes. Here is how:

Home Folder Mac

1. Open the Notes app on your Mac

2. Create or select an existing note to lock

3. Click the padlock icon and select Lock Note

4. You will be asked to enter your password. It is also recommended that you enter a password hint. The hint will be displayed after you entered a wrong password three times. All of your other Apple devices (iOS, iPhone or iPad and macOS) will use this password if they are using the same iCloud account.

5. Click Set Password

To remove a Notes password, again click the padlock icon and and select Remove Lock.

Password Protect PDF Files in Preview

You can password protect PDF files in the Preview app (PDF won’t open?). Here is how:

1. Open the PDF file you wish to password protect in Preview

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2. Go to File > Export

3. Select the “Encrypt” box, enter your password and click Save.

4. Next time you want to open this file you will need to enter its password.

Note that you can password protect other file types using this method. You can simply convert your files to PDF files in Preview by going to File > Export as PDF.

Password protect Pages documents, Keynote presentations and Numbers files

In this article, we are further showing how you can password-protect a Pages document. The steps are identical for Keynote and Numbers as well. Here is how:

1. Open the Pages, Numbers or Keynote file you wish to password protect and go to File > Set Password

2. A new window (require a password to open this document) will appear. Enter your password. You may want to enter a hint also. If you are using the Keychain app, you may want to check the “Remember this password in my keychain” box so that you can add the password to your keychain.

As stated above, you can use the same steps to password protect Keynote presentations and Numbers files.

You can also change or remove your password protected Pages, Keynote and Numbers files by going to Choose File > Change Password. And enter your password, after that you can change or remove the password.

We design Mac hardware and software with advanced technologies that work together to run apps more securely, protect your data, and help keep you safe on the web. And with macOS Catalina available as a free upgrade, it’s easy to get the most secure version of macOS for your Mac.*

Apple T2 chip.
The next generation of security.

The Apple T2 Security Chip — included with many newer Mac models — keeps your Mac safer than ever. The Secure Enclave coprocessor in the Apple T2 chip provides the foundation for Touch ID, secure boot, and encrypted storage capabilities. Touch ID gives you a seamless way to use your fingerprint to unlock your Mac, fill passwords in Safari, and make purchases with Apple Pay. Secure boot helps ensure that you are running trusted operating system software from Apple, while the Apple T2 chip automatically encrypts the data on your Mac. So you can be confident knowing that security has been designed right into the architecture of your Mac, from the ground up.

Apple helps you keep your Mac secure with software updates.

The best way to keep your Mac secure is to run the latest software. When new updates are available, macOS sends you a notification — or you can opt in to have updates installed automatically when your Mac is not in use. macOS checks for new updates every day, so it’s easy to always have the latest and safest version.

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Protection starts at the core.

The technically sophisticated runtime protections in macOS work at the very core of your Mac to keep your system safe from malware. This starts with state-of-the-art antivirus software built in to block and remove malware. Technologies like XD (execute disable), ASLR (address space layout randomization), and SIP (system integrity protection) make it difficult for malware to do harm, and they ensure that processes with root permission cannot change critical system files.

Download apps safely from the Mac App Store. And the internet.

Now apps from both the App Store and the internet can be installed worry-free. App Review makes sure each app in the App Store is reviewed before it’s accepted. Gatekeeper on your Mac ensures that all apps from the internet have already been checked by Apple for known malicious code — before you run them the first time. If there’s ever a problem with an app, Apple can quickly stop new installations and even block the app from launching again.

Stay in control of what data apps can access.

Apps need your permission to access files in your Documents, Downloads, and Desktop folders as well as in iCloud Drive and external volumes. And you’ll be prompted before any app can access the camera or mic, capture keyboard activity, or take a photo or video of your screen.

FileVault 2 encrypts your data.

With FileVault 2, your data is safe and secure — even if your Mac falls into the wrong hands. FileVault 2 encrypts the entire drive on your Mac, protecting your data with XTS-AES 128 encryption. And on Mac systems with an Apple T2 Security Chip, FileVault 2 keys are created and protected by the Secure Enclave for even more security.

Designed to protect your privacy.

The most secure browser for your Mac is the one that comes with your Mac. Built-in privacy features in Safari, like Intelligent Tracking Prevention, help keep your browsing your business. Automatic strong passwords make it easy to create and use unique passwords for all the sites you visit. And iCloud Keychain syncs those passwords securely across all your devices, so you don’t have to remember them. You can also easily find and upgrade any weak passwords you’ve previously used (and reused and reused and reused).

Automatic protections from harmful sites.

Safari also helps safeguard you against fraudulent websites and those that harbor malware — before you visit them. If a website seems suspicious, Safari prevents it from loading and notifies you. And when connecting to unencrypted sites, Safari will warn you. So everything you need to browse without worry is right at your fingertips.

Find your missing Mac with Find My.

The Find My app combines Find My iPhone and Find My Friends into a single, easy-to-use app on Mac, iPad, and iPhone. Find My can help you locate a missing Mac — even if it’s offline or sleeping — by sending out Bluetooth signals that can be detected by nearby Apple devices. These devices then relay the detected location of your Mac to iCloud so you can locate it in the Find My app. It’s all anonymous and encrypted end-to-end so no one — including Apple — knows the identity of any reporting device or the location of your Mac. And it all happens silently using tiny bits of data that piggyback on existing network traffic. So there’s no need to worry about your battery life, your data usage, or your privacy being compromised.

Keep your Mac safe.
Even if it’s in the wrong hands.

All Mac models with the Apple T2 Security Chip support Activation Lock — just like your iPhone or iPad. So if your Mac is ever misplaced or lost, the only person who can erase and reactivate it is you.