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Base64 Encoder / Decoder

Client-side Base64 encoder and decoder using TextEncoder/TextDecoder. Handles Unicode correctly, shows a "Decode result" swap button, and one-click copy. Popular embed for developer blogs, API documentation, and security tutorials.

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Embed code

<div data-widget="base64"></div>
<script async src="http://localhost:4321/embed.js"></script>

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