gallsec

How to verify that nothing leaves your device

Prepared by Kantante Sp. z o.o. · Content updated:

Open the app

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gallsec is designed so documents, prompts and keys stay in the current browser tab. You do not have to take our word for it - you can watch the Network panel while you work, or disconnect from the internet after the app is ready.

Shared checklist

  1. Wait until the banner says the app is ready offline. Prepare optional PDF support first if you need it - that download is public code, not your document.
  2. Open the Network panel for your browser (steps below) and clear the request list so you start from an empty view.
  3. Load and process a document or prompt. New requests that carry your document content should not appear.
  4. Optionally disconnect from the internet (or enable airplane mode) and repeat the full workflow from a ready state.

Open the Network panel

Chrome / Edge

  1. Press F12, or Ctrl+Shift+I (Windows/Linux) / ⌘⌥I (macOS), to open DevTools.
  2. Select the Network tab.
  3. Optional: enable Disable cache while DevTools remains open.
  4. Click Clear (the 🚫 icon) so the request list is empty before you load a document.

Firefox

  1. Press F12, or Ctrl+Shift+E (Windows/Linux) / ⌘⌥E (macOS), to open the Network monitor.
  2. Confirm you are on the Network tab.
  3. Optional: open the gear menu in that panel and enable Disable HTTP Cache (when toolbox is open).
  4. Click the trash icon to clear the request list before you load a document.

Safari

  1. Enable the Develop menu once: Safari → Settings → Advanced → “Show features for web developers” (wording may vary by version).
  2. Open Develop → Show Web Inspector, or press ⌘⌥I.
  3. Select the Network tab.
  4. Click the clear button so the request list is empty before you load a document.

On a phone or tablet the same checks apply, but opening a full Network panel usually needs a desktop browser on the same page, or remote debugging from a computer. Airplane mode after readiness is still a useful check on mobile.

What this check shows - and what it does not

  • The page Content-Security-Policy includes connect-src 'none', so the application itself cannot open new network connections after load.
  • Your browser may still check for Service Worker updates on its own schedule; that is browser maintenance of public app files, not an upload of your document.
  • Extensions with page access, malware and the operating system are outside this check. Use a trusted device. Once you copy a result into another service, that service’s rules apply.

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