When you save a received file, it stays exclusively in your browser. Nothing is sent to any server. Here's how you can verify it.
IndexedDB is a database built directly into your browser. It allows web applications to store large amounts of data locally on your device.
Unlike cookies or localStorage, IndexedDB can store binary data such as images, videos, and other files.
The InstDrop server never sees your files. It only serves as an intermediary to establish P2P connections between devices.
Your browser has tools that let you see exactly what's happening. Here are two ways to verify:
Find the "instdrop-media" database
instdrop-media → media-filesYou'll see a list of all saved files with their metadata (name, size, type). Data is stored only here – in your browser.
You will see NO network request when saving a file. This proves that the file is saved only locally in your browser.
The only network requests you'll see are WebSocket messages for P2P signaling – these contain no file data.
1. In the app: Go to "Saved Files" page and click "Clear all"
2. In browser: Settings → Privacy → Clear site data → Select instdrop.cz
3. In DevTools: Application → IndexedDB → instdrop-media → Right-click → Delete database
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WebRTC is the technology that powers InstDrop's secure, direct file transfers between devices. Here's everything you need to know.
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