Why do other Base64 tools break on emoji?

Because btoa, the browser function most of them call directly, only accepts Latin-1.

Base64 encode and decode

Convert text to Base64 and back.

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Result

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Why do other Base64 tools break on emoji?: Because btoa, the browser function most of them call directly, only accepts Latin-1.
Is Base64 encryption?: No, and this matters.
Can I encode a file?: Not yet on this page.