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Base64 Decoder

Decode Base64 into readable UTF-8 text locally.

Local processingYour input stays hereSimple controls

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Input
0 characters · 0 bytes
Output
0 characters · 0 bytes

Text uses UTF-8. Base64 is an encoding, not encryption. The decoder accepts UTF-8 text, not arbitrary binary files.

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Processed locally in your browser

Your input does not need to be uploaded to an EvryNest server. Nothing is saved automatically.

How It Works

  1. 1
    Paste Base64

    Enter Base64 encoded UTF-8 text.

  2. 2
    Decode the text

    Validate the alphabet, padding and decoded UTF-8 bytes.

  3. 3
    Copy the result

    Read or download the recovered Unicode text.

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Frequently Asked Questions

How does Base64 Decoder work?

The decoder checks Base64 padding and alphabet, then requires valid UTF-8 text. Binary file decoding is not supported.

Does this tool upload or save my input?

Core processing happens locally in this browser tab. Input and output are not sent to a processing server or stored automatically. Copy and download only occur when you request them.

What happens with large or invalid inputs?

Input limits and errors are shown in the workspace. JSON supports up to 1 MB and 100 nesting levels; large previews can be truncated while downloads retain the full result.