Base64 Encoder and Decoder

Base64 is a way of representing any data using only 64 safe characters: letters (upper and lowercase), numbers and a few symbols. The idea is to turn information — which may contain problematic characters — into plain text that travels without getting corrupted through systems built to handle text only.

When encoding, the tool takes your text, converts it to bytes and rewrites those bytes in the Base64 alphabet. When decoding, it does the reverse, recovering the original text. That's why encoded output tends to look scrambled and slightly larger than the input — Base64 doesn't compress or encrypt, it only rewrites.

This version correctly handles accents and emojis using UTF-8 encoding. That avoids the classic problem of special characters "breaking" in simpler tools. All processing happens in your browser, with nothing sent over the network.

Base64 shows up a lot in web development. It's how small images are embedded directly in HTML or CSS (data URLs), how certain tokens and credentials are transported, and how attachments travel inside emails.

In day-to-day coding, the need is usually specific: decoding a Base64 snippet that appeared in a config, an authentication header or an API response, to see what's inside. Or the reverse — encoding text to paste into a field that expects that format. Having both directions on the same screen covers both cases without installing anything.

The most dangerous misconception is thinking Base64 is security. It isn't encryption: anyone can decode Base64 in seconds. Storing a password "in Base64" thinking it's protected is a serious mistake — it's practically the same as leaving it visible.

Another recurring problem is special characters in tools that don't handle UTF-8. Without that care, accents and emojis get corrupted on the way in or out. That's why this tool converts via UTF-8 — so the text comes back identical.

There's also the confusion when decoding text that isn't valid Base64. If characters are missing, spaces are left in, or the content simply isn't Base64, decoding fails. The tool warns you instead of returning meaningless output.