Base64 Converter

What this tool does

Encode text for transport or inspect text stored in Base64 fields. This is useful when debugging payloads; it does not encrypt files or protect secrets.

How to use it

1. Enter plain text and choose Encode, then copy the output.
2. Paste the encoded result into the input and choose Decode to reverse it.
3. If decoding fails, check that the input is complete standard Base64, not a data URL or an entire JWT.

Example

Text: Hello
Base64: SGVsbG8=
Decoding SGVsbG8= returns Hello.

Limits and common mistakes

Anyone can reverse Base64. The converter handles UTF-8 text rather than arbitrary binary files. Base64url uses a different alphabet, which this tool does not automatically normalize. Whitespace, line breaks and non-ASCII characters affect the output.

Base64 standard: RFC 4648