Convert text to Base64 or decode a Base64 string back to readable text. Runs locally in your browser — nothing is uploaded.
Encoding is UTF-8 safe — emoji and non-Latin text round-trip correctly.
Base64 turns binary or text data into a set of 64 plain ASCII characters (A–Z, a–z, 0–9, +, /). It doesn't compress or encrypt anything — it just makes data safe to put somewhere that only expects text, like an email body, a URL, a JSON field, or an HTTP header.
MIME email encodes binary attachments as Base64 so they survive being sent through text-only mail systems.
HTTP Basic Authentication sends username:password as a Base64 string in the Authorization header.
Small images and fonts can be embedded directly in CSS or HTML as data:image/png;base64,... to skip an extra request.
Some APIs expect binary fields (like file uploads or signatures) as Base64 text inside a JSON body.
No. Base64 is an encoding, not encryption — anyone can decode it instantly, with no key required. Don't use it to protect secrets.
The = characters are padding. Base64 processes data in 3-byte chunks; padding fills the last chunk when the input length isn't a multiple of 3.
This version handles text input. For files, the same Base64 principle applies, but you'd need a file-reading step first — let us know if that's something you need and we'll consider adding it.
No. Encoding and decoding both happen locally in your browser using standard JavaScript — nothing is uploaded to a server.
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