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Base64 & URL Encoder/Decoder

Encode and decode Base64 text, and percent-encode or decode URL components.

Base64

Text

URL component

Text

Everything runs in your browser. Nothing you type is sent or stored. Do not paste secrets you would not show to others; encoding is not encryption.

How it works

Base64 text is encoded as UTF-8 first, so accented letters and emoji survive the round trip. Decoding reports an error if the input is not valid Base64 or does not decode to valid UTF-8. URL encoding percent-escapes every character that is not allowed in a URL component, the same as JavaScript's encodeURIComponent.