Lockdown Mode is a security feature on Mac that reduces certain features, connections, and website capabilities to help protect against highly sophisticated cyberattacks. It is designed primarily for people who may be personally targeted by advanced spyware or other exceptionally sophisticated threats—not for routine malware protection.
To turn it on, open Apple menu > System Settings > Privacy & Security > Lockdown Mode, select Turn On, and follow the onscreen instructions. You can disable it from the same location, although macOS may require you to restart your Mac.
Quick Answer
Lockdown Mode creates a more restrictive operating environment by limiting features that could be abused during a targeted attack. Depending on your Mac and software, it can affect:
- Messages and message attachments
- Web browsing in Safari
- FaceTime calls and invitations
- Shared albums
- Apple services and invitations
- Configuration profiles
- Connections from accessories
- Some collaboration and media features
Most Mac users should leave Lockdown Mode turned off. It can make everyday tasks less convenient and may prevent websites, people, or services from working normally. Use it when you have a specific reason to believe you could be targeted by an unusually sophisticated attack, or when a security professional or organization recommends it.
What Is Lockdown Mode?
Lockdown Mode is an optional security setting that limits parts of macOS commonly used to deliver malicious content or exploit vulnerabilities. Instead of trying to detect every possible attack, it reduces the number of features an attacker can use.
This protection comes with trade-offs. Websites may look different or fail to work, message attachments may be blocked, invitations may be rejected, and some devices or services may be unavailable. Lockdown Mode is therefore not a general-purpose “make my Mac safer” switch for everyone.
It is also different from ordinary security practices such as:
- Installing macOS updates
- Using a strong password
- Enabling FileVault
- Turning on Find My Mac
- Keeping apps up to date
- Avoiding suspicious links and attachments
- Using two-factor authentication for your Apple Account
Those protections remain important whether Lockdown Mode is enabled or disabled.
Who Should Use Lockdown Mode?
Lockdown Mode is intended for a small group of people who may be targeted because of their work, identity, public profile, or access to sensitive information. Examples may include:
- Journalists and human-rights workers
- Activists and political organizers
- Government employees
- Executives or researchers handling sensitive information
- People involved in legal, investigative, or security-related work
- Individuals who have received a credible warning about targeted spyware
The feature may also be appropriate on a Mac used to handle highly sensitive information if a qualified security team recommends it.
For most people, the security benefits do not justify the restrictions. Ordinary online threats—including common phishing attempts, malicious downloads, and account theft—are better addressed with software updates, secure passwords, two-factor authentication, and careful browsing habits.
How to Turn On Lockdown Mode
Before enabling Lockdown Mode, save your work and close apps that are performing important tasks. macOS may require you to restart your Mac, and restricted features may affect open websites, messages, calls, or shared content.
- Click the Apple menu in the top-left corner of the screen.
- Select System Settings.
- Click Privacy & Security in the sidebar.
- Scroll down to Lockdown Mode.
- Click Turn On.
- Read the information about the feature, then click Turn On Lockdown Mode if prompted.
- Authenticate with your Mac login password, Touch ID, or another requested method.
- Restart your Mac if macOS asks you to do so.
After Lockdown Mode is enabled, macOS applies its restrictions automatically. You do not need to activate it separately in Safari, Messages, or other apps.
If You Do Not See Lockdown Mode
The setting may be unavailable because:
- Your Mac does not support the feature.
- Your installed version of macOS does not include it.
- A work or school administrator controls the setting.
- You are looking in System Preferences rather than System Settings on an older macOS release.
If your Mac is managed by an organization, contact the administrator before changing security settings.
What Changes When Lockdown Mode Is Enabled?
The exact behavior can depend on your Mac, the installed software, and the services you use. In general, Lockdown Mode restricts features in the following areas.
Messages
Some message attachments and other message features may be blocked. The restrictions are intended to reduce the risk from specially crafted files or content delivered through Messages.
This can affect legitimate messages, too. Someone may send an attachment that cannot be opened while Lockdown Mode is active. If you need to receive a file, ask the sender to use a safer alternative, such as a trusted file-sharing service, or temporarily disable Lockdown Mode only if doing so is appropriate.
Safari and Websites
Safari applies stricter limits to certain web technologies. Some websites may:
- Load incorrectly
- Display a warning
- Omit images or interactive elements
- Require additional steps
- Fail to support certain features
- Work only after you exclude the site from Lockdown Mode
Lockdown Mode is not meant to make every website unusable. It selectively limits capabilities that could increase the attack surface—the collection of features an attacker might try to exploit.
FaceTime and Invitations
Incoming FaceTime calls or invitations from people you have not previously contacted may be restricted. If you regularly communicate with new contacts, this can make FaceTime less convenient.
Established conversations and contacts may continue to work, but behavior can vary depending on the service and the type of invitation.
Shared Albums
Shared Albums may be disabled or unavailable while Lockdown Mode is active. This can affect both viewing and sharing photos through that feature.
Apple Services and Collaboration Features
Some Apple services, invitations, and collaboration features may be limited. Depending on the service, you may be unable to accept invitations, participate in shared content, or use certain collaboration tools normally.
Configuration Profiles
Installing new configuration profiles may be blocked. Configuration profiles can change settings on a Mac, so restricting them helps prevent an attacker from silently applying unwanted configuration.
If your employer, school, or another trusted organization needs you to install a profile, contact its administrator before disabling Lockdown Mode.
Accessories and Wired Connections
Some connections to accessories may be limited while your Mac is locked. This can affect certain USB or other wired accessories, especially if the Mac has not been unlocked since being connected.
If a trusted accessory does not work, unlock your Mac and reconnect it. If it remains unavailable, check whether Lockdown Mode is responsible before changing other settings.
Other Media and Web Features
Some media formats, fonts, previews, and other content types may be restricted. These limits can affect websites, messages, and files even when the content is legitimate.
The goal is to reduce exposure to complex content that could potentially contain an exploit. The trade-off is that some normal content may not behave as expected.
How to Exclude a Website From Lockdown Mode
Safari lets you exclude individual websites when you need a site to work normally. This does not turn off Lockdown Mode for your entire Mac.
- Open Safari.
- Visit the website you want to exclude.
- Click the Safari menu in the menu bar.
- Choose Settings for [website name].
- Locate Lockdown Mode in the website settings.
- Turn off the setting for that website, if the option is available.
- Confirm the change if Safari asks you to do so.
- Reload the webpage.
The website exclusion applies only to that site. Other websites continue to receive Lockdown Mode’s stricter protections.
When to Avoid a Website Exclusion
Do not exclude a website simply because it is inconvenient. First check that:
- You typed the address correctly.
- The site belongs to a trusted organization.
- Your browser and macOS are fully updated.
- You are not being redirected from a suspicious link.
- The site is necessary for your work or communication.
A website exclusion reduces the protection applied to that site. Remove the exclusion when you no longer need it.
Apple Account Considerations
Lockdown Mode is a device-level setting, but your Apple Account remains important to your overall security.
Enabling Lockdown Mode does not replace:
- A strong, unique Apple Account password
- Two-factor authentication
- Recovery contact or recovery key planning
- Reviewing devices associated with your Apple Account
- Keeping trusted phone numbers and contact information current
If your Apple Account is compromised, an attacker may still be able to access account-linked services even if Lockdown Mode is enabled on one Mac. Review your Apple Account security separately.
To review account access, open System Settings, click your name at the top of the sidebar, and examine the account, device, and sign-in options available there. Remove devices you do not recognize and change your password if you suspect unauthorized access.
If your Apple Account is used on multiple Apple devices, remember that enabling Lockdown Mode on a Mac does not automatically mean every other device is protected in the same way. Check each device separately.
How to Turn Off Lockdown Mode
Turning off Lockdown Mode restores the features and connections that were restricted. Save your work first, because macOS may require a restart and open apps or web pages may be interrupted.
- Click the Apple menu.
- Select System Settings.
- Click Privacy & Security.
- Scroll to Lockdown Mode.
- Click Turn Off.
- Authenticate when prompted.
- Restart your Mac if requested.
If you created website exclusions while Lockdown Mode was enabled, review them after turning the feature off. They may remain as website-specific settings and could affect behavior if you enable Lockdown Mode again later.
When Should You Temporarily Disable It?
You may need to disable Lockdown Mode when you must:
- Use a trusted website that cannot function with the restrictions
- Install an approved configuration profile
- Use a required accessory or service
- Open legitimate content that is blocked
- Participate in a collaboration or invitation workflow
- Troubleshoot an incompatibility
Before disabling it, consider whether the task can be completed another way. For example, you might use a different trusted browser-compatible service, ask someone to provide a file in another format, or use a separate Mac that does not contain sensitive information.
If you do disable Lockdown Mode, turn it back on as soon as the task is complete. Restart if required and verify that the setting shows as enabled.
Troubleshooting Lockdown Mode
A website will not load correctly
Try these steps:
- Confirm that the website address is correct.
- Reload the page.
- Update macOS and Safari.
- Try another trusted website to determine whether the issue is site-specific.
- Use Safari’s website settings to exclude only that site if necessary.
- Remove the exclusion when finished.
Avoid disabling Lockdown Mode globally when a single-site exclusion is enough.
An attachment will not open
The attachment may be restricted by design. Ask the sender to provide the information through a trusted alternative, such as plain text or a reputable file-sharing service.
Do not disable Lockdown Mode to open an unexpected attachment, especially if you were not expecting the message.
FaceTime invitations are missing
The sender may need to contact you through an existing conversation or another trusted communication method. If you regularly receive legitimate invitations from new people, consider whether Lockdown Mode is appropriate for your current situation.
A USB accessory does not work
Unlock your Mac and reconnect the accessory. If it still does not work, check whether the device requires a configuration profile or special software. Contact your organization’s administrator before disabling Lockdown Mode on a managed Mac.
You cannot turn off Lockdown Mode
Check that you are using an administrator account or can authenticate when macOS requests authorization. A work or school administrator may control the setting. If the Mac is managed, contact the organization’s support team.
You are unsure whether Lockdown Mode is necessary
If you are considering it because of a suspicious message, pop-up, or account alert, start with basic security steps:
- Do not click the suspicious link.
- Close the webpage or message.
- Update macOS and your apps.
- Change a compromised password from a trusted device.
- Enable two-factor authentication.
- Contact the affected service through its official website.
- Seek advice from a qualified security professional if you face a credible targeted threat.
Frequently Asked Questions
Does Lockdown Mode protect my Mac from all malware?
No. Lockdown Mode reduces exposure to certain advanced attack techniques, but it is not a complete antivirus or malware-prevention system. Continue updating macOS and apps, using strong passwords, and avoiding suspicious files and links.
Should everyone turn on Lockdown Mode?
No. Most users do not need it. Its restrictions can interfere with websites, messages, calls, accessories, and collaboration features. It is intended for people facing unusually sophisticated, targeted threats.
Does Lockdown Mode delete files or messages?
Lockdown Mode is designed to restrict certain content and features, not to erase your personal files. However, blocked attachments or unavailable services may affect how you access content. Save important information elsewhere before changing the setting.
Does Lockdown Mode work on my other Apple devices?
Enabling it on a Mac does not necessarily enable it on your iPhone, iPad, or other Apple devices. Check and configure each supported device separately.
Can I use a website while Lockdown Mode is enabled?
Usually, yes. Some sites may have reduced functionality. Safari may let you exclude an individual website when you trust it and need its full capabilities.
Does Lockdown Mode improve performance?
No. Its purpose is security, not speed or battery life. In some cases, restricted website features may change how a page behaves, but you should not enable it as a performance setting.
Can I use Lockdown Mode on a work Mac?
Possibly, but check with your organization first. Lockdown Mode can interfere with configuration profiles, accessories, authentication systems, and collaboration tools required for work.
Final Thoughts
Lockdown Mode is a specialized defense for people who may face highly sophisticated, targeted cyberattacks. It works by limiting risky features across macOS, Safari, Messages, FaceTime, accessories, and other services—but those limits can make ordinary tasks more difficult.
For most Mac users, regular software updates, strong account security, two-factor authentication, careful browsing, and safe handling of files provide the more practical foundation. Enable Lockdown Mode when your threat level justifies its restrictions, and use website exclusions or temporary changes only when necessary.