The 7 Things You Should Never Type Into a Public AI Tool
Why What You Type Into AI Tools Matters More Than You Think
Public AI tools have become part of everyday life. People use them to write emails, solve problems, get advice, and look things up. They’re fast, helpful, and easy to use. But there’s something a lot of people overlook: everything you type into a public AI tool could be stored, reviewed, or used in ways you didn’t expect.
Most free and public AI platforms collect the conversations you have with them. This data can be used to improve the system, reviewed by human teams for quality checks, or in some cases, exposed in a security breach. That’s not a reason to stop using AI tools altogether. It is, however, a very good reason to think carefully about what you share.
Here are the seven things you should never type into a public AI tool — and why keeping them private is so important for your AI privacy and data security.
1. Your Passwords or Login Credentials
This one seems obvious, but it happens more than you’d think. Someone gets locked out of an account or forgets how their password manager works, and they paste their credentials into a chat window hoping for help. Don’t do this.
Passwords are the most basic layer of your digital security. If a public AI platform stores your conversation — and many of them do — your password is now sitting in a database you have no control over. Even if the platform itself is trustworthy, no system is completely safe from breaches.
The same rule applies to security questions, PINs, and recovery codes. Treat all of these like you would treat cash in your hand — you wouldn’t hand them to a stranger, so don’t hand them to a machine connected to the internet.
2. Social Security Numbers and Government IDs
Your Social Security number (SSN), national ID number, passport number, or driver’s license number are among the most sensitive pieces of information you own. In the wrong hands, they can be used to steal your identity, open credit accounts in your name, or commit fraud.
There’s almost no reason why you would need to share this information with an AI tool. If you’re trying to fill out a form or understand what information is required for a government application, you can describe the situation without typing in the actual numbers.
For example, instead of typing “My SSN is 123-45-6789 and I need help filling out this form,” you can simply ask “What fields are typically required on a Social Security benefits form?” You get the help you need without putting your confidentiality at risk.
3. Financial Account Details
Bank account numbers, credit card numbers, routing numbers, and investment account information should never be entered into a public AI chat. Even partial numbers can be risky depending on the context.
People sometimes type these in when they want help understanding a bank statement, disputing a charge, or setting up a payment. But there’s no need to include the actual numbers. You can describe your situation in general terms and still get useful guidance.
Data security around financial information is serious business. A single exposed account number, combined with a few other pieces of your information that might already be publicly available, can be enough for someone with bad intentions to cause real damage to your finances.
4. Private Medical Information
It’s completely understandable to want quick answers about health concerns. AI tools can seem like a convenient way to make sense of a diagnosis, research a medication, or understand a treatment plan. But sharing detailed personal medical information comes with real risks.
Medical data is some of the most sensitive information that exists. It can affect your insurance coverage, your employment, and your personal relationships if it ends up in the wrong hands. Public AI tools are not bound by the same privacy regulations that govern healthcare providers, like HIPAA in the United States.
You can still use AI tools for general health questions. The key is to keep the details general. Instead of typing “I was diagnosed with [condition] and my doctor prescribed [specific medication] at [specific dose],” ask broader questions like “What are common treatment approaches for this type of condition?” That way, you protect your information without losing access to helpful answers.
5. Confidential Work or Business Information
This is a big one for professionals. AI tools are incredibly useful for drafting reports, summarizing meetings, or working through business problems. The risk comes when people paste in confidential company information without thinking about where it goes.
Trade secrets, proprietary strategies, client data, unreleased product details, legal documents, and internal financial information are all examples of things that should never go into a public AI tool. When you paste that information in, you’re essentially sending it to a third-party server outside your organization’s control.
Many companies have already issued internal policies about this because employees were unknowingly sharing sensitive business data with public AI platforms. Beyond the company risk, this can also put you personally in a difficult position if you’ve signed a confidentiality agreement.
If your workplace uses an enterprise AI solution with proper data protection agreements in place, that’s a different situation. But free, public-facing AI tools are not the place for sensitive business data.
6. Personal Information About Other People
Information protection isn’t just about protecting yourself. It’s also about respecting the privacy of other people in your life.
When you type detailed information about a friend, family member, colleague, or anyone else into a public AI tool, you’re sharing their private details without their knowledge or consent. This could include things like their address, their health struggles, their relationship problems, or their financial situation.
People often do this with good intentions — they want advice on a difficult situation or help writing a message. But you can get that help without exposing another person’s private details. Describe the situation in general terms, change identifying details, or simply leave out specifics that aren’t necessary for the AI to give you useful guidance.
Think about how you would feel if someone typed your private information into a platform without asking you first. That perspective is a good guide for how to handle information about others.
7. Anything You Wouldn’t Want Made Public
This last point is the most important one, and it’s the simplest rule to follow: if you wouldn’t be comfortable seeing it on the front page of a newspaper or posted on a public website, don’t type it into a public AI tool.
This covers a wide range of things — personal secrets, private communications, embarrassing situations, legal troubles, family conflicts, and more. The reason this rule matters is that AI platforms are not private diaries. They’re internet-connected services that handle enormous amounts of data, and despite their best efforts, no platform can guarantee complete privacy.
A good practice is to pause before hitting send and ask yourself: “If this conversation were made public tomorrow, would I be okay with that?” If the answer is no, rephrase your question or leave the sensitive details out.
How to Use AI Tools Safely
None of this means you should avoid AI tools entirely. They are genuinely useful, and when used thoughtfully, they can save you time and help you accomplish things more efficiently. The goal is to use them wisely.
Here are a few simple habits that support better AI privacy:
- Read the privacy policy of any AI tool you use regularly. It doesn’t have to be a deep legal dive — just understand the basics of what data they collect and how long they keep it.
- Use general language instead of specific details whenever possible. You can almost always get a useful answer without sharing sensitive specifics.
- Opt out of data sharing if the platform gives you that option. Many do, and it takes only a minute to change the settings.
- Use enterprise or private AI tools for sensitive work. These are designed with stronger data protection agreements and are a better fit for professional or confidential tasks.
- Treat AI like a public space. Just as you wouldn’t shout your credit card number across a crowded room, don’t type it into a public chat window.
The Bottom Line on AI Privacy and Data Security
Public AI tools are powerful and useful. But they were not built to be secure vaults for your most sensitive information. Understanding that distinction is the first step toward using them safely.
The seven categories above — passwords, government IDs, financial details, medical information, confidential business data, other people’s personal details, and anything you’d want kept private — cover the most common and most serious risks. Keep those things off the keyboard when you’re in a public AI chat, and you’ll significantly reduce your exposure to data security risks.
AI is here to help you. A little awareness about what you share ensures it helps you without putting your information, or anyone else’s, at unnecessary risk.
