Question 1

What is Base64 encoding?

Accepted Answer

Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters (A-Z, a-z, 0-9, +, /). It converts every 3 bytes of input into 4 characters of output, making binary data safe to transmit in text-only contexts such as email bodies, HTTP headers, and JSON payloads.

Question 2

Where is Base64 encoding used in practice?

Accepted Answer

Base64 is used in many places: embedding images inline in HTML and CSS as data URIs, encoding binary attachments in email (MIME), storing credentials in HTTP Basic Authentication headers, encoding binary fields in JSON APIs, and constructing JWT (JSON Web Token) payloads. It is also used to encode certificates in PEM format.

Question 3

Does this Base64 encoder support Unicode and special characters?

Accepted Answer

Yes. The encoder first converts the input text to UTF-8 bytes and then applies Base64 encoding to those bytes. This means emoji, accented letters, CJK characters, and any other Unicode code point are handled correctly. The output is standard Base64 that can be decoded by any compliant decoder.

Question 4

How much larger does Base64 make the data?

Accepted Answer

Base64 encoding increases the size of the data by approximately 33 percent. This happens because every 3 bytes (24 bits) of input become 4 Base64 characters (32 bits). Padding characters (=) are added when the input length is not a multiple of 3. For a 1 KB file, the Base64 output will be about 1.37 KB.

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