Septian R.
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Base64

Encode and decode without line wrapping — matching Android’s NO_WRAP, and tolerating input that has wrapping.

encode androidkeystoreencodingutf-8

Encoding never wraps, matching Android's Base64.NO_WRAP. Decoding accepts wrapped input and strips it.

Result 
  
 
 
 
Android has two Base64 modes and the difference only shows up when something breaks. DEFAULT wraps output at 76 characters; NO_WRAP does not. A wrapped string pasted somewhere that expects unwrapped is a silent corruption that surfaces later as a decode failure. This encodes the NO_WRAP way and decodes either. UTF-8 is handled properly, so accented characters and emoji survive — plain btoa() throws on those.