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Decoding Base64 reverses the encoding: every four ASCII characters are mapped back to three bytes, and those bytes are then interpreted as UTF-8 text. This tool does both steps, so paste a Base64 string and get the original human-readable content immediately. It tolerates missing padding and line breaks inside the input, which is common when the value came from an email header or a multiline config file.
Decode the Base64 portion of a Basic auth header to confirm a client is sending the right username and password.
Secrets come out of kubectl as Base64. Decode them to verify credentials, tokens, or certificate content quickly.
Strip the data URI prefix and decode the payload to see what actually shipped inside an inline resource.
Older systems often wrap plain-text configuration in Base64 for transport. Decode to get the readable form.
The bytes are probably not UTF-8. The source may be binary like an image or certificate, which needs a binary viewer instead of a text decoder.
No. The tool ignores whitespace inside the Base64 string, which makes pasting multi-line MIME blocks straightforward.
Use the dedicated URL-safe decoder for that variant; standard decoding only understands the + and / alphabet.
If the length is wrong or the string contains illegal characters, you will get a clear error rather than quiet corruption.