Base64 Decoder

Decode Base64 to text

Decode standard Base64, Base64URL and data URIs into readable UTF-8 text with validation.

Example

UTF-8 text Hello becomes SGVsbG8=. Decoding reverses the operation. Binary data may not be readable text; download it using the files tool.

Base64 represents each three bytes as four characters, increasing size by roughly one third. Normalization preserves bytes; it cannot recover corrupted or missing data.

Text forms work without JavaScript. File conversion happens locally in your browser. Text submitted for conversion is processed on the server and is not stored.

Specification: RFC 4648.