Laptop CareGuide
AI Writing Tools and Your Laptop: What Leaves the Machine
Every AI writing feature on a laptop sits somewhere between two extremes: a model running on the machine, where your text never leaves, and a cloud service, where every word is sent to someone else's servers. Knowing which one you are using, and what it keeps, takes ten minutes and is worth doing once.
Quick answer
Assume a cloud AI tool stores what you send it unless its settings say otherwise, and check whether it uses your text for training. Review browser extensions and remove any writing helper that can read all websites unless you need it. For sensitive drafts, use a model that runs on the laptop itself and confirm it works with the network off.
On this page
Four places AI lives on a laptop
| Where it runs | Does your text leave the laptop? | What to check |
|---|---|---|
| Cloud assistant in a browser tab or app | Yes, every prompt | Retention period, training setting, who can see chat history |
| Browser extension (grammar, rewriting, summarising) | Usually yes, and it may read pages you did not choose | Site access permission, what it sends, whether it is still maintained |
| Built into the operating system or office suite | Sometimes; some features run locally, others call a cloud service | The feature's own privacy page and any on-device option |
| Local model runner | No, once the model is downloaded | Cloud or sync options switched off; test offline |
Cloud assistants
A cloud assistant sends your prompt and any pasted text to the provider's servers, where a large model produces the reply. Providers differ on what happens next. Common settings include whether conversations are stored in your history, how long they are kept, and whether they may be used to improve the provider's models. Business and education plans often have stricter defaults than free personal accounts. Read the data controls page once, choose the settings you want, and assume anything pasted before you changed them has already been stored.
Browser extensions deserve the most suspicion
Writing extensions are convenient because they work everywhere, and that is also the risk. An extension with permission to read and change data on all websites can see every page you open, including webmail, banking and school portals. Open your browser's extensions page, look at each writing or AI helper, and set its site access to on click or to specific sites where the browser allows it. Remove any you no longer use. Extensions are sometimes sold to new owners who change what they collect, so an old favourite deserves a periodic look.
Built-in features
Operating systems and office suites now include rewriting, summarising and image features. Some run entirely on the laptop using its processor or NPU; others quietly send text to a cloud service. The settings page for each feature usually says which, sometimes with a separate switch for on-device processing only. The guide to laptop specs for local AI explains what hardware those on-device features need.
Local models
A model that runs on the laptop is the private option. After the one-time download it needs no connection, and the text you type stays in memory and in whatever files you save. The step-by-step guide to running an AI writing assistant offline covers setup and the offline test that proves nothing is being sent.
A 15-minute privacy checklist
- List what you use. Cloud assistants, extensions, built-in features and any local runner.
- Open each tool's data controls. Choose whether chats are kept and whether they may be used for training.
- Trim extension permissions. Restrict site access, remove unused helpers.
- Check sync. Some tools sync history across devices; turn it off on shared laptops.
- Never paste secrets. Passwords, card numbers, medical details and other people's private information do not belong in any assistant.
- Keep your drafts yours. Write in your own files with version history, as the draft version history guide describes, and paste only what you need into a tool.
Shared and work laptops
On a laptop owned by an employer or school, assume administrators can see installed software and may log network traffic, whatever a tool's own settings say. Follow the organisation's policy on AI tools, use approved ones, and keep personal writing on a personal machine. On a family laptop, use separate user accounts so chat histories and extension data are not shared.
This page belongs to the laptop care section. Privacy and resilience go together: a 3-2-1 backup of your documents protects drafts that never leave the machine, and the laptop heat guide explains why a laptop running a local model gets warm. Even a battery that is looked after matters here, because local models drain it quickly.
Common questions
Do AI writing tools store what I type?
Cloud tools usually store it for some period, and some use it for training unless you opt out. Local models store only what you save.
Are grammar extensions safe?
Reputable ones are, but they see a great deal. Limit their site access and remove any you do not actively use.
Does incognito mode make an AI tool private?
No. It stops the browser keeping local history; the service still receives and may store your text.
Is a local model completely private?
Your text stays on the laptop once the model is downloaded and cloud options are off. The laptop's own security still matters.
What should I never paste into an AI tool?
Passwords, financial details, health information, confidential work and anyone else's personal data.
Sources
- Google Chrome Help: Install and manage extensions: reviewing and removing browser extensions and their site access.
- Microsoft Support: View your data on the privacy dashboard: reviewing data a cloud account keeps.
- LM Studio: Offline Operation: local models keep typed text on the machine.