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Translate text and bytes

Base64 Encoder and Decoder

Choose text or a local file, encode it into Base64, or paste Base64 to decode. Preview text results and download binary output when needed.

Private by default

Processing stays in your browser. Your file is not sent anywhere by this tool.

Use the tool

Add your file or text below, adjust the options if needed, then download the result.

Loading the local processor…

You can add

UTF-8 text, Local file, Base64 text

You will get

Base64 text, Decoded UTF-8 text, Decoded file

How to use Base64 Encoder and Decoder

  1. 1

    Choose a direction

    Select encoding or decoding, then add text, a file, or a Base64 string.

  2. 2

    Run the conversion

    Create the translated output and review any invalid-input message.

  3. 3

    Copy or download

    Copy text output or save decoded binary content as a file.

When this tool is useful

  • Encode a small asset for a data URL experiment.
  • Inspect a Base64 text value during development.
  • Decode a known file payload received from an API response.

Browser and format limits

  • Base64 makes data larger and is not a form of encryption.
  • Decoded binary content may not produce readable text.
  • Large files can create long strings and use substantial browser memory.

Practical tips

TIP 1

Do not use Base64 to protect private information.

TIP 2

Keep the original filename and content type when decoding a known file.

TIP 3

Use a file transfer method instead of Base64 for very large assets.

Base64 Encoder and Decoder questions

Is Base64 encryption?

No. It is a reversible encoding that represents bytes as text and provides no secrecy.

Why is Base64 longer than the original?

The text representation adds overhead, so encoded data is typically larger than the source bytes.

Why is decoded output unreadable?

The source may represent binary content such as an image or PDF rather than UTF-8 text. Download it as a file instead.

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