People running on mainframe emulation, using back versions that are only seven-bit-clean.

This is a serious question. Someone paid for a webdomain and build a whole product around base64 conversion.

That is something 3 lines of pure JavaScrit with no library dependencies could do.

Who would build such a website and company and who on earth would pay for it?

Context: at Zapier this is the standard App for Base64 conversions. One can easily just add a JS codeblock so it’s not forced on users, but still. It’s weird.