Base64 Encoder & Decoder

Binary-to-Text Encoding & UTF-8 Safety

Base64 is a binary-to-text encoding scheme designed to transmit binary payloads across protocols that only support ASCII characters (such as email via MIME, HTTP Authorization headers, and data URIs).

Unicode / Multibyte Encoding Precision

Standard legacy browser functions like `btoa` fail when encountering characters outside the Latin1 range (such as emojis or accented characters). ToolVyne employs modern `TextEncoder` and `TextDecoder` Web APIs to convert UTF-8 character sequences into byte arrays before radix-64 transformation, guaranteeing zero encoding distortion.

Check an encoding round trip

Choose Encode and enter Hello. Standard Base64 returns SGVsbG8=. Switch to Decode and paste that output to recover Hello. The URL-safe option substitutes - and _ for + and / and removes trailing padding; use the format expected by the receiving application.

The encoder converts text to UTF-8 bytes before encoding. The decoder interprets decoded bytes as UTF-8 text, so it is not a binary file viewer. Base64 is reversible encoding, not encryption: anyone with the encoded string can recover its contents. Do not treat an encoded password or token as protected.