Base64 decoder
Base64 Decoder is a simple and free online tool that quickly and easily decodes your data to human-readable text.
What is Base64?
Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. The term Base64 originates from a specific MIME content transfer encoding.
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Base64 validator
Online Base64 decoder also validates if your Base64 encoded string is valid.
If your Base64 encoded string can not be decoded, the validator will show you an error message. Otherwise, if Base64 string is valid, you will see the decoded string in the result text field.
If you leave auto-decoding turned on, Base64 validator will validate the input string on every text change.
How to check whether a string is Base64 encoded or not?
Online Base64 decoder can tell you if your string is Base64 encoded by validating it.
If Base64 validation returns an error for your string, it is not Base64 encoded or encoding is not done properly.