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Base64 Encoder & Decoder

Encode plain text to Base64 or decode a Base64 string back to readable text. All processing happens locally in your browser.

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What is Base64?

Base64 is a binary-to-text encoding scheme that represents binary data as printable ASCII characters. It's widely used in:

  • Email: Encoding attachments in MIME.
  • Web: Embedding images as data URIs in HTML/CSS.
  • APIs: Transmitting binary data in JSON payloads.
  • Authentication: HTTP Basic Auth headers.

How does it work?

Base64 converts every 3 bytes of input into 4 ASCII characters, resulting in roughly a 33% increase in size. The output uses characters A-Z, a-z, 0-9, +, /, and = for padding.

Is my data secure?

Yes. All encoding/decoding happens 100% in your browser. No data is ever transmitted to any server.

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