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Base64 Decoder

Decode Base64 strings back to plain text. Quickly inspect encoded data and API responses.

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Decoding Base64 text

The decoder removes whitespace, adds missing padding and attempts to interpret decoded bytes as UTF-8 text.

Output behavior and limits

Binary data or invalid UTF-8 can produce an error. URL-safe Base64 uses a different alphabet and is not automatically normalized here.

Paste aGVsbG8= to obtain hello. If decoding a token fails, check whether it is Base64URL or an encrypted value before editing its characters.

Before replacing your original

  • Processing runs locally in this browser; keep a copy of the source input.

Processing details

Runs in your browser. File handling policy

Implementation and guidance reviewed .

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