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Looks like https://gchq.github.io/CyberChef/ except that you can use CyberChef offline. Why reinvent the wheel all the time?

> Why reinvent the wheel all the time?

Because since the invention of the wheel, there have been a LOT of changes and inventions that have dramatically improved the wheel.

Well it can be a good learning experience for OP, that's reason enough. By the way, I use CyberChef occasionally and I love it, strongly recommended!