Base64 Encoder / Decoder

Convert text to Base64 and back, with full UTF-8 support — emoji, accents, and non-Latin scripts encode correctly. Everything runs in your browser; nothing is uploaded.

Text → Base64

Plain text

Base64 output

Base64 → Text

Base64

Decoded text

Why plain btoa() breaks — and how this tool handles it

The browser's btoa() only accepts characters in the 0–255 range, so it throws on emoji or accented text. This tool first encodes your text as UTF-8 bytes (via TextEncoder) and Base64-encodes those bytes — the standard-compliant approach that matches what servers and other languages expect. Decoding reverses the process and reports clearly when the input is not valid Base64.