llmOverlay — Privacy Policy

Last updated: 2026-06-23

llmOverlay is a Chrome extension that lets you highlight text inside an LLM chat (ChatGPT or Claude) and get a side-panel explanation grounded in that conversation. This policy explains exactly what data the extension touches and where it goes.

Summary

• llmOverlay has no backend server of its own. It does not collect, transmit, or sell your data to the developer.
• The only network requests it makes are directly from your browser to the LLM provider you configured — Anthropic (api.anthropic.com) or OpenAI (api.openai.com) — using your own API key.
• Everything else stays on your device in Chrome's extension storage.

What data is processed

When you trigger an explanation (keyboard shortcut or the side-panel question box), the extension reads, from the active ChatGPT/Claude tab:

• the passage you highlighted,
• the surrounding chat transcript (truncated to roughly 24,000 characters),
• your typed question, if any, and recent prior questions/answers in that tab's session.

This content is sent only to the LLM provider's API to generate the answer.

What is stored, and where

• API keys — stored in chrome.storage.local on your device so the extension can authenticate to the provider. They are never sent anywhere except to that provider's API as the Authorization header.
• Question/answer history and the captured highlight + transcript — stored in chrome.storage.session, which Chrome clears automatically when the browser closes. The in-panel Clear button wipes it on demand.

No data is written to any remote database, analytics service, or developer-operated server.

Third-party processing

Text you submit for explanation is processed by whichever provider you choose:

• Anthropic — anthropic.com/legal/privacy
• OpenAI — openai.com/policies/privacy-policy

Their handling of that data is governed by their own policies and your account settings with them.

What the extension does NOT do

• No analytics, telemetry, tracking, or advertising.
• No selling or sharing of data with third parties (beyond the provider API call you initiate).
• No access to pages other than chatgpt.com and claude.ai.

Permissions

Permissions are scoped to reading the active LLM chat tab, storing your settings and session history locally, and calling the two provider APIs. Each permission is justified in detail in the extension's store listing.

Contact

Questions about this policy: jbatsell65@gmail.com