Talking to an AI chatbot can feel surprisingly private. You type a question, receive an immediate answer, and continue the conversation without another person visibly taking part.
However, an AI chat is not the same as writing in a private notebook. Your prompt may be processed on external servers, stored in your conversation history, reviewed for safety, or handled according to the provider’s privacy policy and account settings.
That makes one question especially important: What personal information should you never share with an AI chatbot?
Passwords, financial details, government identification numbers, confidential work documents, medical records, and private information about other people should generally stay out of consumer AI tools.
Even seemingly harmless details can create privacy risks when combined with your name, workplace, location, or daily routine.
You do not have to stop using AI to stay safe. The goal is to share only what the tool genuinely needs, replace real details with fictional ones, and treat every prompt as information sent to an outside service.
Why an AI Chatbot Is Not a Private Diary
An AI chatbot needs to process your input before it can respond. Depending on the platform, that processing may happen on your device, through remote servers, or through a combination of both.
Services may also handle chat history differently. Some retain conversations, offer temporary chat modes, provide options to limit model training, or allow users to delete previous chats.
The CNIL and South Korea’s Personal Information Protection Commission recommend checking privacy policies and settings before using generative AI.
Their guidance also advises users to hide details such as real names, addresses, schools, passwords, bank information, and personal problems.
Before typing something sensitive, imagine that the information is being submitted through an online form. When you would not place it in an unfamiliar website, you should probably avoid including it in an AI prompt.
Never Share Passwords or Security Codes
Your login credentials should never be entered into an AI chatbot. This includes passwords, personal identification numbers, recovery phrases, authentication codes, and answers to security questions.
An AI assistant does not need your actual password to help you create a stronger one. Ask it to explain password best practices or generate a random example, but never paste a credential you currently use.
One-time verification codes are equally sensitive. A code sent by text message, email, or an authentication application may provide direct access to your account when combined with stolen login information.
The FTC identifies passwords, PINs, and security-question answers as valuable identity information. CISA also recommends using multifactor authentication because it adds protection when a password is compromised.
If you accidentally share a real password, change it immediately. Update every other account where you reused the same credential and enable multifactor authentication.
Keep Financial and Identity Details Private
Never share full bank-account numbers, credit-card details, tax information, or payment credentials with a general-purpose chatbot.
The same rule applies to government-issued identification numbers. Depending on where you live, this may include a Social Security number, national identification number, passport number, driver’s license number, or taxpayer identification number.
Identity thieves can use combinations of personal and financial details to open accounts, make purchases, submit fraudulent claims, or impersonate someone.
The FTC specifically warns that names, addresses, bank information, credit-card numbers, identification numbers, and medical insurance details may be misused for identity theft.
When you need help understanding a financial document, remove identifying information first. Replace real account numbers with placeholders such as XXXX-1234, and change exact balances when those values are not essential.
A chatbot can explain a bank term or help organize a fictional budget without seeing the information required to access your money.
Avoid Sharing Medical and Highly Personal Information
People sometimes use AI chatbots to discuss symptoms, emotional difficulties, relationships, or other deeply personal subjects. While an AI tool may help organize questions or provide general information, it should not automatically receive your full medical history.
Avoid entering your complete name, date of birth, patient number, insurance details, laboratory reports, prescriptions, medical images, or documents containing identifiable health information.
You should also be cautious with information about mental health, sexuality, family conflicts, traumatic experiences, or legal disputes. Even without your name, an unusual combination of age, location, occupation, and personal circumstances might reveal your identity.
NIST notes that AI systems can create privacy risks by making inferences about individuals or uncovering information that was previously private. Such inferences can cause harm even when they are inaccurate.
For general assistance, describe the situation broadly. When you need diagnosis or treatment, speak with a qualified healthcare professional rather than relying solely on a chatbot.
Do Not Upload Confidential Work or School Data
Workplace information can be sensitive even when it does not contain a password or bank number.
Avoid pasting customer lists, employee records, private emails, contracts, unreleased financial results, internal strategies, source code, trade secrets, or unpublished research into an unapproved AI service.
For example, asking a chatbot to improve a business email may seem harmless. The risk changes when the message includes a customer’s contact information, details about an unresolved complaint, or confidential pricing.
Students and researchers should also protect unpublished assignments, participant information, interview transcripts, and restricted academic material. School records may contain names, identification numbers, grades, disability information, or disciplinary details.
Use only AI tools approved by your employer or institution for sensitive tasks. Even then, apply data minimization: provide the smallest amount of information needed to complete the job.
NIST’s Privacy Framework encourages organizations to identify and manage privacy risks throughout the way information is collected, processed, stored, and used.
Never Share Someone Else’s Private Information
Your privacy is not the only one that matters. Avoid sharing private information about friends, relatives, colleagues, customers, patients, or employees without a legitimate reason and appropriate permission.
This includes names, phone numbers, addresses, private messages, photographs, medical conditions, financial problems, and workplace disputes.
An AI chatbot may help you draft a reply to a difficult message, but it rarely needs the sender’s real identity. Replace names with labels such as “My Manager,” “Customer A,” or “Family Member.”
Children’s information deserves additional protection. Do not casually enter a child’s full name, school, location, photographs, daily schedule, health information, or contact details.
In the United States, COPPA gives parents control over certain personal information collected online from children under 13, reflecting the need for stronger safeguards around children’s data.
A useful rule is simple: Do not submit another person’s information unless you would be comfortable explaining exactly what you shared and why.
Be Careful with Files, Photos, and Location Data
A file may contain more private information than you can immediately see.
Documents can include tracked changes, comments, author names, hidden spreadsheet tabs, revision history, signatures, or metadata. Photographs may reveal faces, house numbers, vehicle plates, school uniforms, computer screens, and recognizable landmarks.
Some image files may also contain information about when and where a picture was taken. Even when location metadata has been removed, the background may still identify a home, workplace, or routine destination.
Before uploading anything, create a clean copy. Remove unnecessary pages, crop private details, delete comments, flatten tracked changes, and inspect the background of photographs.
Be especially careful with identification cards, boarding passes, invoices, medical letters, résumés, and screenshots. A single image might expose your full name, address, email, phone number, account details, or identification number at once.
What Should You Do If You Already Shared Something?
First, identify exactly what you submitted. The correct response depends on whether you exposed a password, financial detail, personal document, or private information about someone else.
Change leaked passwords immediately and enable multifactor authentication. Contact your bank or card provider if payment credentials were exposed, and monitor your accounts for unfamiliar activity.
Delete the conversation and uploaded files when the platform provides that option. Review whether the service stores memories, connected files, or account history separately.
You should also check the platform’s privacy policy to understand its deletion and retention practices. Removing a conversation from your visible history may not always mean that every copy disappears instantly.
When workplace or customer data is involved, report the incident to your manager, security team, or privacy officer promptly. Early reporting may help the organization reduce the impact.
How to Ask AI Questions More Safely
You can often get the same useful answer without revealing real information.
Replace actual names with fictional ones. Remove addresses, account numbers, contact details, employer names, and dates that are not necessary.
Instead of uploading an entire document, paste only the paragraph you need help understanding. When requesting a résumé review, remove your phone number, home address, references, and any other unnecessary identifiers.
Review the chatbot’s privacy controls as well. Where available, consider temporary conversations, disabled history, limited training permissions, and regular deletion of stored chats.
Most importantly, pause before pressing Send. Ask yourself whether the prompt could identify you, give access to an account, expose another person, or harm your workplace if it became public.
The personal information you should never share with an AI chatbot includes passwords, verification codes, banking credentials, government identification numbers, private medical records, confidential workplace data, and sensitive details about other people.
Files, images, and ordinary conversations can also reveal more than expected. Names, locations, routines, metadata, and personal circumstances may become identifying when combined.
Before submitting your next prompt, remove unnecessary details and replace real information with neutral placeholders. Review the service’s privacy settings and use approved tools for professional tasks.
AI can still be useful without knowing your identity-the safest prompt is usually the one that shares only what is necessary.