What is Base64 decoding?
Base64 decoding converts a Base64 representation back into its original text or binary bytes. A valid Base64 value is not secret—it is simply encoded data.
How to decode Base64
Paste your value into the input field and select Decode Base64. If the value is malformed, the tool will show an invalid-input message instead of guessing.
Common Base64 errors
Errors usually happen because the value is incomplete, has invalid characters, is URL-safe Base64, or has been encoded with a different character set.
Base64 vs Base64URL
Base64URL replaces + and / with URL-safe characters. It is frequently used in JSON Web Tokens.
Frequently asked questions
Is Base64 encrypted?
No. It can be decoded without a key. Do not treat it as a security mechanism.
Can I encode a decoded value again?
Yes. Use the Base64 Encoder to convert readable text back to Base64.