Base64 Encoder/Decoder

Why Use Base64 Encoding?

Base64 is a binary-to-text encoding scheme used everywhere in web development — from data URIs and email attachments to API authentication headers and JWT tokens. Our free encoder / decoder handles full Unicode input (including emojis and CJK characters) and runs entirely in your browser, so your data never leaves your machine.

Features

  • One-click mode toggle — switch between Encode and Decode instantly.
  • Unicode safe — properly encodes multi-byte characters, accented letters, and emoji.
  • Swap button — move the output back to the input for quick round-trip testing.
  • Copy to clipboard — grab the result with a single click.
  • Client-side processing — your data never leaves your browser.

Common Use Cases

  • Embedding small images as data URIs in HTML or CSS.
  • Encoding binary payloads for JSON APIs or webhooks.
  • Decoding Base64 strings found in JWT tokens, emails, or config files.
  • Testing API authentication headers that use Basic auth (Base64-encoded credentials).

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