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Is ChatGPT private? Lock chats and 3 settings to check

What it does for you: if you've ever asked ChatGPT about a health worry, a money problem, or a family situation, you may not want that chat sitting in the sidebar where anyone who borrows your phone or sees your screen can read the title. As of October 20, 2026, you can lock a chat behind a 4-digit PIN (or Face ID, Touch ID, or your phone's unlock on supported phones). It works on the Free plan too (OpenAI release notes).

This post shows you how to lock a chat in about a minute, the one mistake that can wipe your locked chats, and three other privacy settings worth checking while you're there.

First, what "locked" really means

A locked chat is hidden, not secret. It disappears from your chat list, your pinned chats, and search, and you need your PIN to open it. That's great for a shared family iPad or for sharing your screen.

But OpenAI's own help page is clear that locking a chat does not:

(OpenAI Help: Using locked chats)

So think of it like a drawer with a lock, not a safe. Still worth using.

Lock a chat (1 minute)

  1. Open ChatGPT (the official app or chatgpt.com) and find the chat you want to hide.
  2. Tap or click the three dots (•••) next to the chat.
  3. Choose Lock chat, then Lock chat again to confirm.
  4. The first time, it asks you to create a 4-digit PIN. Enter it twice.

That's it. The chat moves out of your regular list.

To open it later: go to Projects → Locked chats and enter your PIN. On a phone it locks itself again after about a minute away. On the web it locks again when you refresh or close the tab, or you can tap Lock now when you're done.

Want Face ID or fingerprint instead? On iPhone, turn on Face ID or Touch ID under Settings → Security and login → Account PIN. On Android, choose Use device unlock when it asks. This only works on that one device, and your PIN still works everywhere.

Don't see "Lock chat"? OpenAI is rolling it out gradually. Update the app and check again in a few days. Some chats can't be locked at all, including temporary chats, group chats, and archived chats.

The one mistake to avoid: forgetting your PIN

Write your PIN down somewhere safe, like with your other passwords. Here's why:

Path to change it: Settings → Security and login → Account PIN → Change PIN.

3 more privacy settings to check while you're there

1. Stop your chats from training the AI. On the free and personal plans, OpenAI may use your chats to improve its models unless you turn it off. Go to Settings → Data controls and turn off Improve the model for everyone. It applies across your devices when you're signed in, and your old chats stay in your history (OpenAI Help: Data controls). One catch: if you tap thumbs up or thumbs down on an answer, that whole conversation may still be used (OpenAI Help).

2. Use Temporary Chat for one-off private questions. Start a new chat and select Temporary. It won't show up in your history, won't add to what ChatGPT remembers about you, and isn't used for training while it stays temporary. OpenAI may keep a copy for up to 30 days for safety reasons (OpenAI Help: Temporary chat). Rule of thumb: Temporary Chat for "just this once," locked chat for "I want to come back to this."

3. See what ChatGPT remembers about you. Go to Settings → Personalization → Memory to review, fix, or delete what it has saved. Or just ask it:

What do you remember about me? List everything in plain words. Then tell me how to delete any item I don't want you to keep.

Good to know: deleting a chat doesn't always delete a memory saved from it, and deleting a memory doesn't remove it from old chats. To fully remove something, delete both (OpenAI Help: Memory).

Before you paste something private, clean it up

The safest private detail is the one you never typed. You can get help with a letter, a bill, or a hard text without sharing who you are. Paste this first, then your text:

I'm going to paste a letter. Before you help me, list any personal details in it I should remove first, like names, addresses, account numbers, birth dates, or ID numbers. Don't repeat those details back to me. Then explain the letter in plain English and tell me what, if anything, I need to do.

Even better, cover or delete those details yourself before you paste. For more practice with paperwork, try the free drill Decode a confusing letter or bill in plain English.

Never type these into any AI chat: passwords, one-time codes, full card or bank account numbers, or your Social Security number. Nothing in this post needs them. If a message claiming to be from ChatGPT or any company asks for them, it's a scam. The free drill Check a suspicious text or email for scam red flags walks you through it.

Common mistakes

Honest limits

Your 5-minute challenge: open ChatGPT, turn off Improve the model for everyone if you want to, then ask the "What do you remember about me?" prompt above. If there's a chat you'd rather keep out of sight, lock it and write the PIN down.

If you're setting this up for a parent or grandparent, do it together and let them pick the PIN. More free practice is on the Drills page, and the Life Scripts Starter pack ($9) has 40 copy-paste scripts for everyday letters, calls, and planning.

Sources

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Want ready-made scripts? Three packs of 40 copy-paste AI scripts, $9 each: Life Scripts Starter (everyday life), Job Hunt Scripts, and Family & Home Scripts. Or get all 120 in the All-Access Bundle ($19). Compare the packs.