Base64 Encode & Decode

A solution to a problem you have probably forgotten

Base64 exists because the internet's older plumbing was built for text and text alone. Email in particular was designed to carry seven-bit ASCII, and systems along the delivery path felt entirely free to strip the eighth bit, reinterpret control characters, mangle line endings, or truncate long lines. Send raw binary through that and it arrives corrupted. Base64 solves it by re-expressing arbitrary bytes using only 64 characters that every system agrees on — the letters, the digits, and two symbols — so the data survives any channel that can carry plain text at all. The 33 percent size penalty is the toll you pay for that guarantee, and it was an obviously worthwhile trade in a world where the alternative was corruption.

The security misunderstanding that keeps recurring

It is worth saying as plainly as possible: Base64 provides no security whatsoever. It looks scrambled to a human eye, and that superficial resemblance to ciphertext leads people to reach for it as though it were protection. It is not. There is no key, no secret, and no cryptography of any kind — decoding it is a single function call available in every language and every browser console. Security teams find hard-coded credentials 'protected' by Base64 with depressing regularity, and audits routinely turn up API keys and tokens obscured this way in client-side code. If data needs to be secret, it needs actual encryption with an actual key. Base64 is a transport encoding, in exactly the same category as choosing UTF-8 — useful, necessary, and entirely unrelated to confidentiality.