Base64 encoder & decoder
Encode and decode Base64, including the URL-safe variant.
Converters100% client-side
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Output
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About this tool
Converts text to Base64 and back, handling full Unicode correctly by encoding through UTF-8 first — which is where naive implementations built on raw btoa tend to break on accented characters and emoji.
The URL-safe variant is supported too: it swaps + and / for - and _ and drops the padding, which is what you will find inside JWTs and in query parameters.
How to use it
- 1Choose a direction — encode or decode.
- 2Paste your text or your Base64 string.
- 3Switch to the URL-safe alphabet if the value comes from a token or a URL.
Privacy
This tool runs entirely in your browser. Nothing you type or paste is sent to a server, and your local history is stored only on this device.
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