Base64 Encoder/Decoder

An API that expects credentials or a payload encoded as Base64, or a data string received in Base64 that needs to be read as plain text — this tool converts text to and from Base64 encoding in either direction.

What Base64 encoding is (and isn't)

Base64 represents arbitrary data as plain text using 64 safe characters (letters, numbers, plus a couple of symbols), which makes it useful for embedding binary-like data in text-only contexts such as JSON, URLs, or email. It's important to understand that Base64 is an encoding, not encryption — anyone can decode it back to the original text instantly, so it should never be used to actually protect sensitive information like passwords.

Where Base64 encoding/decoding comes up

Decoding a Base64-encoded JWT (JSON Web Token) payload segment to inspect its contents while debugging an authentication issue. Encoding a string of text or credentials for an API request that specifically requires Base64-encoded input in its documentation. Decoding a Base64 string found in a config file, log, or API response to see its actual readable content. Encoding simple text data for embedding in a URL or data attribute where certain characters would otherwise need special handling.

Frequently Asked Questions

Is Base64 the same as encryption? No — Base64 is purely a way of representing data in text form; it provides no security or confidentiality, since anyone can decode it instantly using this same tool or a single line of code.

Why did I get an error when decoding? The "Decode" option expects the input to be valid Base64 text (only certain characters are valid); pasting regular text or a malformed Base64 string into decode mode will produce an error rather than garbage output.

Is my text uploaded anywhere? No — encoding and decoding happen entirely in your browser using built-in JavaScript functions; nothing is sent to a server.