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Privacy policy for LumiFlow

LumiFlow by Helia Hon

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Privacy policy for LumiFlow

LumiFlow Privacy Policy

Last updated: October 21, 2026

This policy describes how the LumiFlow browser extension for Chrome and Firefox handles data.

SUMMARY

LumiFlow has no server, no account system, no analytics, no advertising and no usage tracking. It does not collect any data about you, and nothing is sent to the developer.

Your checkpoints, settings and API key stay in your browser. If you turn on API compression, the conversation text needed for that compression is sent directly from your browser to the AI provider you chose. It does not pass through any LumiFlow server.

DATA STORED IN YOUR BROWSER

LumiFlow uses the browser's local extension storage to keep:

  • your checkpoint segments;
  • your API settings and, if you save one, your API key;
  • preferences such as Auto or Manual mode.

This data never leaves your browser except as described under "API compression" below.

READING CONVERSATIONS ON AI WEBSITES

LumiFlow reads the conversation on the supported AI website you are using, only when you click one of its buttons (Download, Compress or Absorb). It writes a saved checkpoint into the chat input box only when you click Inject.

For ChatGPT, Claude and DeepSeek, LumiFlow reads the current conversation from the same data the website itself uses to display it, with the login you already have on that website. For Gemini, and whenever that is not available, it reads the conversation from the page.

This happens entirely inside your browser. LumiFlow does not send these conversations to the developer or to any LumiFlow server.

IMAGES AND FILES (DOWNLOAD ZIP)

When you click Download ZIP on ChatGPT, Claude or Gemini, LumiFlow downloads the images and files in that conversation (for example pictures you uploaded, PDFs, or AI-generated images) from the AI website and saves them, together with the conversation, as a ZIP file on your computer. These files go only to your own computer. On Gemini, LumiFlow reads images that the page has already loaded; if an image cannot be read, it captures that image from the visible page (a screenshot of the browser tab, cropped to the image) and saves it into the same ZIP. Screen captures are not kept or sent anywhere else.

ChatGPT and Gemini store files on separate sites (oaiusercontent.com and googleusercontent.com). When Download ZIP needs a file from one of these sites for the first time, LumiFlow opens a page where you can allow access to that site. This permission is optional: if you decline, the ZIP contains the conversation without those files, and you can change your choice later in the browser's extension settings.

API COMPRESSION (OPTIONAL)

API compression is off unless you turn it on and enter your own API key. When it is on and you click Compress:
  • the conversation text needed for the checkpoint is sent directly from your browser to the provider you selected (Google Gemini, OpenAI or Anthropic);
  • your API key is sent to that provider to authorize the request;
  • that provider's own privacy policy, data retention, pricing and terms apply.

Provider privacy policies:
WHAT LUMIFLOW DOES NOT DO

LumiFlow does not include analytics, usage tracking, advertising trackers or crash reporting. It has no user accounts and no server that stores conversations or API keys. It does not sell or share data, because it does not collect any.

PERMISSIONS AND WHY THEY ARE NEEDED
YOUR API KEY

If you save an API key, it is stored in the browser's local extension storage and is used only for requests to the provider you selected. Like any data stored on your device, it could be read by someone or some software with access to your browser profile. We recommend using a key with a spending limit and changing it from time to time.

DELETING YOUR DATA
  • Delete individual checkpoints, or clear them all, in the LumiFlow window.
  • Remove or replace your API key in LumiFlow's settings.
  • Uninstalling LumiFlow removes all of its stored data from your browser.

OPEN SOURCE

LumiFlow is open source under the MIT License. You can read the full code at:
https://github.com/lumihelia/lumiflow

CHANGES TO THIS POLICY

If the way LumiFlow handles data ever changes, for example by adding a server, analytics or a new third-party service, this policy will be updated at the same time as the code and the store listings.

CONTACT

Questions about privacy can be posted at:
https://github.com/lumihelia/lumiflow/issues