Encode and decode base64

Convert text to base64 or back, with a URL-safe option for tokens and query strings. Any file can be encoded, not just text ones, since encoding a binary is the usual reason to need this. Decoding is strict: input that is not valid base64 is reported as such rather than turned into plausible-looking garbage, and when the decoded bytes are not text you get a download instead of a clipboard full of nothing.

This tool runs entirely on your device. Nothing you type here is uploaded, logged or stored.

Settings

EncodeDecode

URL-safe alphabet (- and _ instead of + and /)

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Result

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This tool runs entirely in your browser, so the controls above need JavaScript to do anything. The description stays readable either way — nothing here was ever going to be processed on a server.