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DDevToolery

Does my data leave my browser?

No. Here is how to confirm that for yourself.

No. Every tool processes your input with JavaScript running on your own device. There is no backend that could receive it.

Verifying it

  • Open your browser's developer tools and select the Network tab.
  • Clear the list of existing requests.
  • Paste something into any tool and let it run.
  • No new request appears. Nothing was sent.

The stronger test

Load a tool page, disconnect from the network entirely, then use the tool. It keeps working, because the code is already in your browser and there is nothing to call.

What does touch the network

Loading the page itself. Your browser requests HTML, JavaScript and CSS from the CDN, which necessarily sees your IP address in order to reply. That is the whole footprint.