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I have sent a text file as an attachment from from whatsapp and then when opened the sent file in iPhone app I am seeing =EF=BB=BF in start which means it is BOM utf-8 file. My question is why '=' character is coming after every code instead of 0x?

Also all emoji are coming in this style =F0=9F=98=9D, how can I convert this into simple text in objective C? Any help is much appreciated.

Thanks

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What you're seeing is quoted-printable encoding. This encoding scheme escapes non-printable ASCII or 8-bit characters as =xx where xx is the hex value of the byte. Quoted-printable is mainly used in email transmission. See the question Objective-C decode quoted printable text for tips on decoding.

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