How ChatGPT’s new Lockdown mode protects you from data theft (and what else it does)


ChatGPT's Lockdown mode

Lance Whitney/ZDNET

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ZDNET’s key takeaways

  • Lockdown mode aims to prevent data theft from attackers.
  • This mode is now available to all ChatGPT users.
  • It does limit what you can do on the live web.

AIs can be vulnerable to different security threats. And one of the biggest is prompt injection. By feeding malicious commands into your prompts, an attacker could infiltrate your chats, access external files and services, and steal your personal data. An optional setting in ChatGPT called Lockdown mode tries to protect your account by limiting what you can do and where.

(Disclosure: Ziff Davis, ZDNET’s parent company, filed an April 2025 lawsuit against OpenAI, alleging it infringed Ziff Davis copyrights in training and operating its AI systems.)

Also: How indirect prompt injection attacks on AI work – and 6 ways to shut them down

First kicked off in February to subscribers of ChatGPT for Enterprise, Edu, Healthcare, and Teachers, Lockdown mode is now also available to all other plans, including Free, Go, Plus, Pro, and Business. Though accessible to everyone who uses ChatGPT, the option is designed for people and organizations that work with sensitive information in need of extra protection.

To combat data theft through prompt injection, Lockdown mode limits outbound network requests, such as those to the internet or to an external file service. The idea is to stop any live sensitive information from falling into the hands of an attacker.

Also: Use an AI browser? 5 ways to protect yourself from prompt injections – before it’s too late

The mode doesn’t prevent actual prompt injection attacks. A hacker could still infect your prompts with malicious commands that tap into cached web content or uploaded files. Plus, there are some decided tradeoffs, namely those that involve live web searches or information.

With Lockdown mode enabled, you can’t perform any of the following tasks:

  • Live web browsing. ChatGPT can’t access the live web and instead is limited to cached content. That means any search results may be out of date or even unavailable.
  • View images from the web. ChatGPT can’t display images in regular responses or retrieve them from the live web. You can still upload your own images and ask the AI to generate an image.
  • Deep research. Deep research is unavailable.
  • Agent mode. Agent mode is also unavailable.
  • Canvas networking. You can’t use code that you generate through the Canvas tool to access your network.
  • File downloads. ChatGPT can’t download files to analyze them, though it can still handle any files you upload.

With these restrictions in mind, you may still want to try Lockdown mode if you’re working with highly sensitive or confidential data, either personally or professionally. Just keep in mind that you’ll be limited with any requests that need access to the live web or a live file service.

Lockdown mode is in the process of rolling out, so it may not yet be accessible to all accounts. To enable it on your end, make sure you’re signed in to ChatGPT with your account. Click your account name in the lower left and select Settings. At the Settings window, select Security, scroll down to the section for Advanced Security, and then turn on the switch for Lockdown Mode. A pop-up window explains the restrictions of this mode. To proceed, click the Turn on button.





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If you are a book purist, you might scoff when I recommend an e-reader instead of buying physical books, and I won’t blame you. The allure of the smell of pages, the weight of the book in my hands, the whole ritual, is hard to resist. 

However, if you allow me some leeway to convince you, there’s a strong argument to be made against physical books and in favor of using e-readers. So let me make the case for e-readers, because once you understand what you’ve been missing, it’s hard to go back.

Your entire library fits in your bag

This is the most obvious advantage, but it doesn’t get enough credit. I always read more than one book at a time, and carrying two or three physical books around is not realistic. Thick books alone are a chore to carry.

With an e-reader, you carry hundreds of books in a slim package. Switching between titles takes a second. If you travel frequently, this alone is reason enough to make the switch.

A thousand-page hardcover is great for your bookshelf but terrible for your commute.

Fat books are a workout, not a reading experience

If, like me, you are into fantasy books, you know they can be a behemoth to handle. You have to constantly shift how you’re holding it, find a way to keep it open, and somehow also stay comfortable. Thin books are fine, but the moment a book crosses a certain thickness, it starts working against you.

An e-reader weighs the same regardless of whether you’re reading a short novel or a massive fantasy series. That’s it. Whether I am reading The Count of Monte Cristo or the next book in Brandon Sanderson’s The Stormlight Archive series, my Supernote Nomad remains the same. 

Reading at night without waking anyone up

I do a lot of my reading at night, and this is where physical books completely fall apart for me. Lamps and book lights never feel comfortable. The light is never quite right, and if you share a room with someone, the whole setup becomes a problem.

Most e-readers, including Kindles, have a built-in backlight that you can dim to whatever level feels right. You can even switch to warm light mode, making it easier on your eyes. 

I’ve read at 3 AM with the brightness all the way down, and it felt completely natural. No lamp and no squinting required. 

Look up any word without losing your place

English is not my first language, and even for native speakers, encountering an unfamiliar word in the middle of a chapter is common. With a physical book, your options are to grab your phone and look it up, which almost always leads to distraction, or skip it and lose a bit of meaning.

On a Kindle or most other e-readers, you tap the word and the definition appears instantly. You can translate it, add it to a vocabulary list, and get back to reading in seconds. I look up far more words now than I ever did with physical books, and my reading comprehension is genuinely better for it.

Taking notes you’ll actually use later

I used to annotate physical books with a pen, and those notes would just sit there on the page, never to be seen again. Transferring them somewhere useful took more effort than I was ever willing to put in.

With my Supernote Nomad, I can use its Digest feature to clip what I am reading and quickly add any additional handwritten notes. I can then export those notes to Obsidian and process them. 

If you use any e-reader, highlighting a passage and adding a note will take a couple of seconds. Most e-readers also aggregate all your highlights and notes in one place, allowing you to quickly riffle through your notes without flipping pages. 

With physical books, my notes died on the page. With an e-reader, they became something I actually use.

Since these are digital notes, you can process them into your note-taking app to further digest the material.

Books are cheaper and easier to buy

Buying physical books is always more expensive than getting the digital version. Also, since most publishers are phasing out mass-market paperbacks, we are left with trade paperback and hardcover options, which may look better but also cost significantly more.

E-books don’t have that problem. I have purchased several books at less than half the price I would have paid for a physical version. Also, most of the time, e-books are on sale, making them even more affordable. 

And when you find a book you want to read at midnight, you don’t have to wait for a delivery or drive to a store. You buy it and start reading immediately. The convenience is hard to overstate once you get used to it.

Should you switch?

If you love the experience of physical books, the covers, the smell, the shelf aesthetic, that’s a completely valid reason to stick with them. There’s nothing wrong with it. I myself am curating my own bookshelf, and there will always be a place for those special books. 

But for convenience and ease of discovery and reading, I recommend you at least invest in one e-reader. It’s also one of the best times to buy them, as you can get good options around $100

Since these are e-readers, you don’t even need to upgrade them as often as your phone. If you don’t accidentally break them, they can easily last 5-6 years, making them worth the investment.



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