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Pro tip: If you do something like this, you should open the page in incognito, then open developer tools of the browser and enable “offline” mode under network. This will effectively prevent the tab you have the developer tools in from contacting the internet. Once you’re done using it, close the incognito window without enabling network again (it’s possible that it could store locally until network is found if it’s malicious, that’s why we use incognito too).
This tool works without internet once you’ve loaded it. So even if it’s malicious, if you follow my steps, it cannot be used to steal your information as it won’t be able to send your information to anyone.