Source: https://www.zaproxy.org/docs/desktop/addons/encode-decode-hash/options/

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Options Encode/Decode screen

This screen allows you to configure the Encode/Decode/Hash options:

Base64 - Charset

Allows the user to select which character set should be used for Base64 conversions.

Base64 - Break Lines

Indicates whether or not Base64 encoding should break lines at 76 characters (MIME standard).

Hashers - Always output lower case?

Indicates whether or not the output of predefined Hash processors should always be lower case or not (upper case).