Base64 encoding converts binary data or text into a string of ASCII characters, making it safe to transmit over protocols that only support text — like HTTP headers, JSON payloads, or email (MIME). This free online Base64 encoder and decoder works instantly in your browser with full UTF-8 support.

Common use cases include encoding images to data URIs, embedding fonts in CSS, passing binary data in REST API requests, and storing binary blobs in JSON or XML documents.

When to use Base64 encoding

Encode images as data:image/png;base64,... for inline CSS or HTML
Encode Basic Auth credentials (username:password) for Authorization headers
Encode binary files to pass through JSON APIs that don't support raw bytes
Decode JWT payload sections (which use Base64url encoding)
Store small binary assets in environment variables or config files

Base64 vs Base64url

Standard Base64 uses + and / characters which are unsafe in URLs. Base64url replaces them with - and _ and omits padding. JWTs and OAuth tokens use Base64url. This tool supports both variants.

FAQ

Is Base64 a form of encryption?

No. Base64 is an encoding scheme, not encryption. Encoded data can be decoded by anyone. Use it for safe transport, not for securing secrets.

Why does Base64 encoded text end with == ?

Base64 pads output with = characters to ensure the total length is a multiple of 4. One or two padding characters may appear depending on input length.

Does this tool support Unicode / emoji?

Yes — input is encoded to UTF-8 bytes first, then Base64-encoded, ensuring correct handling of any Unicode character.