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Base64 Encoder and Decoder

Encode text to Base64 or decode it back, with full Unicode support.

Runs in your browser — nothing is uploaded

What Base64 is for

Base64 rewrites arbitrary data using only 64 safe characters, so it can travel through places that expect plain text: a JSON field, an HTTP header, a data URI in a stylesheet, an email attachment. It is an encoding, not encryption — anyone can decode it, and this page is the proof.

Umlauts, accents and emoji

The browser's built-in btoa accepts only Latin-1, which is why so many Base64 tools break on "Zürich" or an emoji. This one converts to UTF-8 bytes first, so anything you can type round-trips exactly.

URL-safe Base64

Standard Base64 uses + and /, both of which mean something else inside a URL, plus = padding that tends to get mangled. The URL-safe variant swaps them for - and _ and drops the padding. Use it for anything landing in a query string or a path segment — JWTs are encoded exactly this way.

Nothing is uploaded

The work happens in your browser. Decoding a token here does not send it anywhere, which matters given what tokens usually contain.

Other free tools

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