Security
JWT Decoder
Decode JWT tokens to inspect the payload, header, claims, timestamps, and signature segment when you need to understand what a token contains.
What Base64 Encoder / Decoder helps you do
Use this tool when a value is already Base64 encoded and you need to read it, or when plain text needs to be converted into Base64 for transport, storage, or testing.
It is especially handy for token segments, copied payloads, encoded config values, and other text that has been wrapped in Base64 or Base64Url.
Use the tool
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Frequently asked questions
What is Base64 used for?
Base64 is commonly used to transport binary or text content safely through systems that expect plain text, such as APIs, tokens, emails, and configuration values.
What is the difference between Base64 and Base64Url?
Base64Url is a URL-safe variation that avoids plus and slash characters and often drops trailing padding.
Can I use this for JWT segments?
Yes. JWT header and payload segments use Base64Url encoding, so this tool is useful for quick token inspection.
Can it decode invalid Base64?
No. The decoder validates the input and returns a clear error when the content is not valid Base64.