Base64 encode Emoji & Unicode
Base64-encode a string containing emoji or non-Latin characters.
Example
Input
🚀 Hello
Base64 output
8J+agCBIZWxsbw==
The gotcha
The naive approach — `btoa("🚀 Hello")` in browser JavaScript — throws `InvalidCharacterError`. `btoa` only handles Latin-1 (byte values 0–255). Real Unicode characters use multiple bytes in UTF-8, so you need to UTF-8 encode to bytes first, then Base64-encode the bytes.
When to use this
Anytime you're encoding strings that might contain emoji, Chinese, Arabic, accented characters, or any character outside the basic Latin range. Decoding must reverse the same steps — Base64-decode to bytes, then `TextDecoder` from bytes to string.
Open the encoder