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Base64 Decoder

Decode Base64 back into readable text. Input that is not valid Base64 is refused with a message rather than returned as nonsense.

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How to use it

  1. Type or paste your text into the box above.
  2. The result appears as you type — or press Convert.
  3. Press Copy result to put it on your clipboard.

Example

Input
SGVsbG8sIFV0aWxvb3Qh
Result
Hello, Utiloot!

Questions

Why does my string not decode?

Base64 only uses A–Z, a–z, 0–9, + and /, with = as padding. A stray character anywhere makes the whole string invalid.

Is my text sent to a server?

No. This tool runs entirely in your browser — nothing you type or paste is uploaded, logged or stored anywhere.

Is there a limit on how much text I can use?

There is no fixed limit. Very large documents depend on your device’s memory, but ordinary pages and files are handled instantly.

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