Encode plain text to Base64 or decode Base64 back to text.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Input standard UTF-8 text to encode, or paste a Base64 string to decode.
Click 'Encode to Base64' or 'Decode to Plain Text'.
Copy the processed string with one click for API, JWT, or data URI usage.
Yes, our converter correctly handles multi-byte UTF-8 character sequences without corruption.
Yes, output can be formatted as raw Base64 or ready-to-use data:text/plain;base64 URIs.
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