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Base64 encoder & decoder
64baser is a tool for text or binary to Base64 and vice-versa conversion

Library

Base64 Encoding Explained: How It Works & When to Use It

Base64 converts binary data into plain ASCII text by mapping every 3 bytes to 4 characters from a 64-symbol alphabet. Originally designed for email in the late 1980s, it now underpins data URIs, JWT tokens, HTTP Basic Auth, and PEM certificates. The trade-off is a 33% size increase -- but the point is compatibility, not efficiency.