Decode or encode Base64 strings. Everything runs in your browser, nothing is sent to a server.
Base64 is an encoding scheme that converts binary data into ASCII text using a 64-character alphabet: A-Z, a-z, 0-9, +, and /, with = for padding.
Every 3 bytes of input produce 4 characters of output, increasing size by roughly 33%.
Common uses: email attachments (MIME), data URIs, JSON Web Tokens (JWTs), embedding images in CSS/HTML, and transmitting binary data through text-only protocols.
A URL-safe variant replaces + and / with - and _to avoid conflicts in URLs and filenames (RFC 4648 §5).
Base64 is not encryption. It provides no security. Anyone can decode it.
