Base64 Decoder

Decode Base64 or Base64URL strings back to readable text. Binary data is shown as hexadecimal.

What is the Base64 Decoder?

Decoding reverses Base64 encoding to recover the original bytes.

How does it work?

URL-safe characters are normalised, missing padding is added, and the bytes are decoded as UTF-8. If they are not valid text, a hex dump is shown instead.

Example

SGVsbG8= decodes to “Hello”.

Frequently asked questions

Is my data sent to a server?

No. This tool runs entirely in your browser; nothing you paste is uploaded or stored.

Why does my output look garbled?

The data is probably binary (an image or a compressed file) rather than text.

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