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Base64 Converter

Encode text to Base64 or decode Base64 back to text.

Encode any UTF-8 text to Base64 or decode a Base64 string back to text. The mode is auto-detected from the input but can be forced.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Base64 encodes 3 bytes (24 bits) into 4 ASCII characters using a 64-symbol alphabet (A–Z, a–z, 0–9, +, /).

In depth

Encode any UTF-8 text to Base64 or decode a Base64 string back to text. The mode is auto-detected from the input but can be forced.