Base64 Encoder / Decoder

encode and decode with step-by-step visualization

Input Text

URL-safe Show Steps

Base64 Output

Base64 Input

URL-safe input Show Steps

Decoded Output

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Include data URI prefix

Base64 Output

The Base64 alphabet maps 6-bit values (0-63) to printable ASCII characters.

Standard: Uses + (index 62) and / (index 63), with = padding.

URL-safe: Uses - (index 62) and _ (index 63), no padding.