When you type or upload into ChatGPT, Claude, Gemini or the like, you're not jotting in a private notebook on your own desk.
You're sending a copy to someone else's computers — usually in another country — under their rules.
The journey (plain English)
| Step | What it means for you |
|---|---|
| 1. You send | Text, files or images leave your device and travel over the internet |
| 2. They process | Their systems generate a reply — and often store the conversation |
| 3. They retain | Chats may sit in your history and in their backups for a while (policy-dependent) |
| 4. They may train | Unless you've opted out (consumer plans), new chats may help train future models |
| 5. They may review | Safety systems — and sometimes humans reviewing samples — can flag harmful content |
| 6. You delete (maybe) | Deleting a chat helps, but it's no guarantee every copy vanishes instantly |
Deleting the chat in the sidebar is well worth doing when you've slipped up. But it does not mean "it never existed," and it doesn't undo any training that already happened before you opted out.
Files are worse than text
Uploading a PDF, spreadsheet or screenshot often quietly hands over:
- Names, addresses and invoice numbers you didn't mean to include.
- Metadata you can't even see in the preview.
- Far more data in one click than you'd ever type into a careful summary.
And Gemini Deep Research that reads your Gmail or Drive is reading your Google stuff on purpose — only switch that on when you actively want it rummaging through there.
Work vs personal accounts
| Account type | Typical training default | Still don't paste secrets? |
|---|---|---|
| Personal (Free / Plus / Pro) | You must check the settings yourself | Yes |
| Work / Team / Enterprise | Often no training by default | Yes — employer rules and client duties still apply |
My own boring rule: I keep one cloud account for messy experiments, and I treat anything work- or client-related as red-tier unless I've anonymised it first. Dull as ditchwater. Saved me twice.
As of June 2026 — these policies change. Verify in your app's own help centre whenever you're unsure.
Continue — a simple traffic-light for what's safe to paste.