Nonsense example. Just showing a round trip.

Text to bytes to and HexString, round trip.ps1

$originalMessage = "hi 🐒 world"

$enc     = [Text.Encoding]::GetEncoding('utf-8')
$bytes   = $enc.GetBytes( $originalMessage)
$hexStr  = [Convert]::ToHexString( $bytes )
$asBytes = [Convert]::FromHexString( $hexStr )

$roundTrip = $enc.GetString( $AsBytes )

[pscustomobject]@{
   Original    = $originalMessage
   Enc         = $enc
   Bytes       = $bytes
   HexStr      = $hexStr
   BytesAgain  = $asBytes
   RoundTrip   = $roundTrip
   IsValid     = $roundTrip -eq $originalMessage
}

<#
output

Original   : hi 🐒 world
Enc        : System.Text.UTF8Encoding+UTF8EncodingSealed
Bytes      : {104, 105, 32, 240…}
HexStr     : 686920F09F909220776F726C64
BytesAgain : {104, 105, 32, 240…}
RoundTrip  : hi 🐒 world
IsValid    : True

#>