Encode UTF-8 text as standard Base64, or decode a padded Base64 string back to text.
Encoding turns UTF-8 bytes into the standard Base64 alphabet with padding. Decoding accepts that alphabet only and returns the UTF-8 text.
The encoder uses the standard alphabet of letters, digits, plus, and slash, with equals signs for padding, as described in RFC 4648. The input is UTF-8, not a file upload.
The decoder rejects characters outside that alphabet and rejects a length that is not a multiple of four. URL-safe Base64, which uses minus and underscore, is not accepted here.
Choose encode or decode.
Paste the text or the Base64 string.
If decoding fails, check for a missing padding character or a character that is not in the standard alphabet.
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Pasting a URL-safe token into the standard decoder and treating the error as a broken secret.
No. Swap minus for plus and underscore for slash, and add padding, before decoding.
No. Base64 is an encoding. Anyone can decode it.