but can be used in an offline setting if the program code using it is inline or from a progressive web app that works in offline mode (i.e. all processes can be localized in a cold environment for reducing attack vectors). I host that version of the same AES tool that I modified here (for educational purposes) which works offline (.html file can be saved locally) and sources entropy securely as per the W3C spec:
bcaventures.com/AES.html