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Base64 Encoder / Decoder

Encode text to Base64 or decode a Base64 string back to plain text.

🔒 Your data never leaves your device — no servers, no tracking, no worries.

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What is Base64?

Base64 is an encoding scheme that converts binary data into a string of ASCII characters. It uses 64 printable characters (A–Z, a–z, 0–9, +, /) so that binary content can be safely transmitted over text-based channels like email, JSON payloads, or HTML attributes.

Common uses

  • Embedding images or fonts directly in CSS or HTML as data: URIs
  • Encoding credentials in HTTP Basic Authentication headers
  • Passing binary data in JSON API requests or responses
  • Reading JWT tokens — the header and payload sections are Base64-encoded

How to use

Paste any plain text into the Encode tab and press Encode. To reverse the process, switch to the Decode tab and paste a Base64 string. Everything runs locally in your browser — your data is never sent to a server.

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