Base64 is a binary-to-text encoding scheme that represents binary data as ASCII characters. It's commonly used in emails, data URLs, and API communications.

Does it support Unicode?

Yes! This tool properly handles Unicode text (including emoji, CJK characters, etc.) by using UTF-8 encoding before Base64 conversion.

Why is the encoded string longer?

Base64 encoding increases data size by approximately 33%, because it represents 3 bytes of data using 4 ASCII characters.

Yes! All encoding and decoding happens in your browser. Your data is never sent to any server.

Base64 Encoder / Decoder

Your files never leave your device

Encode text to Base64 or decode Base64 back to text. Supports Unicode characters. All processing happens in your browser — your data never leaves your device.