base64tekst

Base64tekst is a term used to describe textual content that has been encoded using the Base64 scheme. It is not a unique cipher, but an encoding that converts binary data into a sequence of ASCII characters to ensure safe transport through systems that expect text.

Base64 encoding works by processing input in 24-bit blocks and mapping them to four characters from the Base64 alphabet (A–Z, a–z, 0–9, + and /). If the final block is incomplete, padding with = is added to complete the quartet. The resulting string is typically longer than the original text by about one third.

Common uses include email MIME bodies, embedding images or files in HTML or JSON, and transmitting data in URLs or scripts. It is also used to obscure content in certain contexts, but it should not be treated as a secure form of protection.

Decoding Base64tekst returns the original data. Correct handling of padding and any inserted line breaks is important, as some implementations wrap long strings or insert newlines.

Variants such as Base64url replace + with - and / with _ to make the encoding safe for URLs and filenames. In practice, many systems can interoperate between standard Base64 and its URL-safe variant, provided the decoder uses the appropriate alphabet.

Related topics include Base64, MIME, and data URLs.