Encode/Decode

certutil

Encode/decode files using Base64 or hexadecimal formats.

certutil -encode <input_file> <output_file>

certutil -decode <input_file> <output_file>

cipher

Encrypt/decrypt files using built-in Windows encryption.

cipher /e <input_file> [/a] [/s:<password>]

cipher /d <input_file> [/a] [/s:<password>]

System.Text Namespace

Invoking the System.Text Namespace, Encoding Class, and GetByte:

[System.Text.Encoding]::GetBytes()

UTF8

Writes output to a file, with options for specifying encoding:

Out-File -FilePath C:\path\to\file.txt -InputObject "Text to add" -Encoding UTF8 

Base64

Decode Base64-encoded strings or files.

ConvertFrom-Base64 -InputObject <encoded_data>

Encode data into Base64 format.

ConvertTo-Base64 -InputObject <data_to_encode>

Base64 encode a string:

[Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes("encoded text"))

Base64 decode a string:

[System.Text.Encoding]::UTF8.GetString([Convert]::FromBase64String("encoded text"))

Base64 decode:

[System.Convert]::ToBase64String([System .Text.Encoding]::UTF8.GetBytes("Text to encode"))

Base64 encode a file:

[Convert]::ToBase64String([System.IO.File]::ReadAllBytes("C:\path\to\inputfile"))

Base64 decode a string to a file:

[System.IO.File]::WriteAllBytes("C:\path\to\outputfile", [Convert]::FromBase64String("Base64EncodedString"))

Unicode Array

Converts the text into a Unicode Array using .NET API:

`([System.Text.Encoding]::Unicode.GetBytes("encoded text"))

URL Encoding

URL encode a string:

[System.Web.HttpUtility]::UrlEncode("encoded text")

URL decode a string:

[System.Web.HttpUtility]::UrlDecode("encoded text")

HTML Encoding

HTML encode a string:

[System.Web.HttpUtility]::HtmlEncode("encoded text")

HTML decode a string:

[System.Web.HttpUtility]::HtmlDecode("encoded text")